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2001 Vol. 23, No. 2

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CARBON ISOTOPE CHARACTERISTICS OF NATURAL GAS IN THE SICHUAN BASIN, CHINA
DAI Jin-xing, XIA Xin-yu, WEI Yan-zhao, TAO Shi-zhen
2001, 23(2): 115-121. doi: 10.11781/sysydz200102115
Abstract(877) PDF-CN(498)
Abstract:
There are over ten gas producing beds and six main gas-generating rock intervals in the Sichuan Basin in the middle of China. In this paper, carbon isotopic data of natural gas from different regions and reservoirs were studied. The δ13C value of most gas samples show the pattern of δ13C1<δ13C2<δ13C3<δ13C4, indicating their biogenic origin. Samples with δ13C1>δ13C2 might be a mixture of gases from different source rocks or of different maturity. The δ13C value of humic gas is more negative than that of sapropelic gas. The δ13C value of the analyzed CO2 indicates it is of biogenic origin.
HYDROCARBON-BEARING PROSPECTS OF VOLCANIC ROCK COVE RED REGIONS IN THE SOUTHEASTERN COASTAL WATERS OF CHINA JUDGED BY THE DISTRIBUTION OF GLOBAL OIL AND GAS FIELDS
GUO Zhan-qian
2001, 23(2): 122-132. doi: 10.11781/sysydz200102122
Abstract(651) PDF-CN(421)
Abstract:
Ma Zong-jin, an academician of Academia Sinica, divided the most active tectonics in the world into circum-Pacific, ocean ridge and north continental three first-order tectonic systems according to global seismic distribution. It is shown by scanning the distribution of global oil and gas fields that they are closely related to the three most active first-order tectonic areas in the world and are distributed near the Phanerozoic volcanic rock belts. The oil and gas fields in the Bohaiwan Basin of China are distributed accompanying the Cenozoic volcanic rock bodies, and the gas fields in the Sacramento Basin of America are faulted superimposed and superpositioned with modern craters. These phenomena show that petroleum and natural gas are closely related to the supply of the Earth's deep seated matter. Spontaneous earthquakes bring about volcanic activities, underground water and natural gas discharge for supracrust. The magma of volcanic activities causes the organic matter "kitchen body" hydrocarbon-generating model for volcanic rock-covered areas, and brings about inorganic matter-ganetic hydrocarbon. Underground water causes the catalytic hydrocarbon-generating model for organic matter, and discharged H2 and CO2 cause the synthetic hydrocarbon-generating model. Crust active areas have many kinds of hydrocarbon-generating mechanism and models. Volcanic activities in crust active areas bring about reservoir cover trap assemblages formed by sediments and magma for sedimentary basins, and constitute hydrocarbon-generating systems of "water-fire" binary structure. Volcanic activities bring about many kinds of hydrocarbon supply caused by many kinds of hydrocarbon-generating models and binary structural reservoir-cover-trap assemblages formed by sedimentary and volcanic rocks for volcanic rock-covered areas. This is advantageous to the formation of oil and gas fields. Thus, the volcanic rock-covered areas in the southeastern coastal waters of China should be prospecting areas for petroleum.
STUDY ON THE CONTROL OF STRUCTURAL SYSTEMS OVER THE DISTRIBUTION OF HYDROCARBON
KANG Yu-zhu
2001, 23(2): 133-140. doi: 10.11781/sysydz200102133
Abstract(566) PDF-CN(316)
Abstract:
Insisting on the essential view of structural systems controlling oil, the author engaged in the work of petroleum geology in more than 20 provinces (regions) or 40 basins in China. By many years of study and practice, the author considered that the Neocathaysian, the Western Regions, latitudinal, Qingzang reversed S type and other major structural systems control the distribution of petroliferous basins, secondary structural systems in a basin control oil-generating depressions and hydrocarbon enriched zones (regions), and varions lower order shear structure controls the distribution of oil and gas fields.
OIL AND GAS PROSPECTS FOR THE MULTICYCLE COMPOSITE BASIN IN THE EAST CHINA SEA SHELF
LI Wei-xian
2001, 23(2): 141-145. doi: 10.11781/sysydz200102141
Abstract(634) PDF-CN(362)
Abstract:
The hydrocarbon geochemical exploration anomalies of raised submarine reefs are the result of reservoir matter in the deep Precenozoic sedimentary basin leaching upwords.In the East China Sea Shelf Basin on the north of the Jiumi-Yushan Major Fault,we should not only continue to look for the Cenozoic oil and gas pools,but also find the oil and gas pools in shallow strata whose hydrocarbon is from deep sources and is formed in the Paleozoic and accumulated in the Cenozoic.This is the new domain of oil and gas exploration in the East China Sea.The major gas source rocks of large oil and gas pools/fields in the East China Sea may be the Paleozoic strata.
ZONARY DISTRIBUTION OF HYDROCARBON IN OIL-ENRICHED RIFTED BASINS AND EXPLORATION DIRECTION IN THE HUIMIN SAG
LI Pi-long
2001, 23(2): 146-148. doi: 10.11781/sysydz200102146
Abstract(520) PDF-CN(358)
Abstract:
Taking Dongying sag as an example, this paper elucidates zonary distribution feature of hydrocarbon in a rifted-basin. By analyzing structure,sedimentation and migration and accumulation of oil and gas, the pool-forming mechanism is discussed by geological analogy. Based on the above, the exploration focus in Huimin sag in the future is determined.
UNCONFORMITY DISTRIBUTION AND TECTONIC MOVEMENT IN THE WESTERN AREA OF THE MANJIAER DEPRESSION
ZHAO Jing-zhou, PENG Wen
2001, 23(2): 149-153. doi: 10.11781/sysydz200102149
Abstract(561) PDF-CN(257)
Abstract:
Based on drilling,seismic and surface outcrop data,S-bottom,C-bottom,C1 b-bottom,T-bottom,J-bottom and K-bottom six major planes of unconformity are recognized in the sedimentary cover of West Manjiaer area.The characteristics of tectonic movement represented by these planes of unconformity and their effects on the tectonic features and sedimentation of West Manjiaer area are discussed.It is considered that there are two episodes of the Early Hercynian movement in West Manjiaer area even in the whole Tarim Basin which formed two major unconformities.One is the Early Hercynian movement of Ⅰ episode which happened at the end of the Devonian and formed the unconformity of C-bottom.The other is the Early Hercynian movement of Ⅱ episode which happeded after Donghe sandstone sedimentation and formed the unconformity of C1 b-bottom.It is also considered that the Indosinian movement represented by J bottom unconformity has important influence on the tectonic features of West Manjiaer area.It terminated the long term developing history of the Lunnan Paleouplift since the Early Paleozoic,and made it possible to form the embryonic Hadexun Uplift.
POOL-FORMING MODEL OF HYDROCARBON IN NANBAXIAN STRUCTURE AND ITS IMPLICATION TO THE EXPLORATION OF THE NORTHERN MARGIN OF THE QAIDAM BASIN
GAO Xian-zhi, CHEN Fa-jing, MA Da-de, CAO Zhi-hong, WANG Li-qun
2001, 23(2): 154-159. doi: 10.11781/sysydz200102154
Abstract(666) PDF-CN(291)
Abstract:
The northern margin of the Qaidam Basin is a petroliferous system in the northern part of the basin with the Jurassic source rock and the Tertiary master reservoir. Nanbaxian structure is a representative tertiary structure on the northern margin of the Qaidam Basin. The structure reflects that the northern margin of the Qaidam Basin was subjected to regional compression or compresso-shearing of different direction and different characteristics in the Paleogene and Neogene, and formed basement-involved and mantle-detached two different tectonic patterns of faults respectively. The basement-involved fault is an essential passage of oil source to form oil and gas pools in the Lower Tertiary reservoir, and the Late Tertiary mantle-detached fault on the other side plays a destructive role to the Lower Tertiary oil and gas pools and results in the formation of the Upper Tertiary secondary oil and gas pools. The properties of crude oil, the homogenization temperature of reservoir inclusions and the n alkane distribution of inclusions all show that the Lower Tertiary reservoir has early and late two stages of hydrocarbon injection and the Upper Tertiary reservoir has only late-staye hydrocarbon injection. The pool-forming model of hydrocarbon in Nanbaxian structure suggests that the enhancement of study on the moving history and sealing history of faults have important significance to the evaluation of hydrocarbon on the northern margin of the Qaidam Basin. Compared with the Upper Tertiary, the Lower Tertiary has more advantageons conditions to form oil and gas pools.
PETROLIFEROUS SYSTEMS AND HYDROCARBON EXPLORATION TARGETS IN THE CAOHU SAG OF THE TARIM BASIN
FU Qiang, HONG Xue-hai
2001, 23(2): 160-164. doi: 10.11781/sysydz200102160
Abstract(603) PDF-CN(225)
Abstract:
The Caohu Sag is located in the North Manjiaer Depression of the Tarim Basin. Its source rocks are the Cambrian and Ordovician melalimestone of the Lower Paleozoic, and its reservoir rocks are the Ordovician limestone and Carboniferous Donghe sandstone of the Paleozoic as well as the Triassic, Jurassic and Cretaceous sandstone of the Mesozoic. The sag, petroleum geologists be of the same view, is a very prospecting region for hydrocarbon exploration. Based on the theory of petroliferous systems, thedeep O2+3-C1 petroliferous system and the upper T-E1 composite petroliferous system are divided, and the matching relationship between the hydrocarbon generation and expulsion of source rocks and the developing periods of traps as well as the patterns and pathways of hydrocarbon migration is discussed. Furthermore, the understanding of hydrocarbon enrichment regularities for the sag is strengthened, and the direction and targets of hydrocarbon exploration in the sag are suggested.
RESERVOIR DISTRIBUTION AND QUALITY OF THE CHENGDU PLAIN AND ITS NATURAL GAS EXPLORATION AND DEVELOPMENT
JIN Xiao-hua
2001, 23(2): 165-173. doi: 10.11781/sysydz200102165
Abstract(869) PDF-CN(353)
Abstract:
The West Sichuan Basin has become an important area of natural gas. In the evolution of the foreland basin, 8km thick clastic rock was deposited. Under the double effects of sedimentation and diagenesis, normal and anomalous two types of natural gas reservoirs can be formed frow shallow to deep strata. They can be further divided into 6+1 ranks. The major pay bed is low-permeable ultra-dense sandstone. Its permeability and pore throat texture are very sensitive to the net pressure of overlying strata. Based on the analysis of confining pressure permeability and mercury-injection data, the technical and economical gradation of reservoir quality mainly marked by in situ (formation) permeability Kms is set up correlated to the well-testing data, and the difficulties and technical strategies for the exploration and development of dense and ultra-dense sandstone gas pools are discussed.
DIVISION AND IDENTIFICATION MARKS OF POOL-FORMING ENVIRONMENT IN XINCHANG GAS FIELD OF THE WEST SICHUAN DEPRESSION
ZHU Tong, YE Jun, WANG Sheng
2001, 23(2): 174-177. doi: 10.11781/sysydz200102174
Abstract(824) PDF-CN(395)
Abstract:
Xinchang gas field is a typical complex gas field in the West Sichuan Depression which has already taken shape and is bearing gas in multiple strata and superimposed by,ulti-type gas pools.Based on the pressure zonation and gas-water occurrence of overpressure gas source in the Xujiahe Formation as well as six types of gas pools established or predicted,the multi-factor comprehensive concept "pool-forming environment" is proposed by fine description of 3-D seismic interpretation results. Furthermore,five types of pool-forming environment with different pool frming mechanism are classified in Xinchang gas field,the pool-forming conditins and,main controlling factors of each pool-forming environment are analysed,and the identification marks of each pool-forming environment are suggested.
COMPREHENSIVE DETERMINATION OF PHASES IN STM OIL AND GAS POOLPU
PU Ren-hai, ZHENG Bing, CAI Qi-xin
2001, 23(2): 178-182. doi: 10.11781/sysydz200102178
Abstract(711) PDF-CN(251)
Abstract:
The Triassic low-relief structural STM oil and gas pool in the North Tarim Basin is a condensate oil and gas pool with bottom water which produces oil and gas simultaneously.But it is difficult to determine whether it is condensate gas phase or binary phases of gas and liquid underground for lack of high pressure sampling and testing data. Predecessors judged it as condensate gas phase according to hydrocarbon features and the ratio of gas and oil.But it was found that the reservoir with 7m thick middle oil formation in discovery well Sha 29 had no obvious high-moveout responses in acoustic logging curves. The determination of phases has great influence on the evaluation,reverse caluation and development planning of the oil and gas pool.Comprehensive using the physical properties,the ratio of gas and oil,the method of component Z values,the method of Φ values,the method of factor determination,the method of well logging interpretation,the positive model of low frequency seismic responses in gas formation and its coincidence with logging responses within low-frequency ranges and at corresponding depths on the top of traps in structural maps,it is considered that the middle oil formation is an oil and gas pool with condensate gas tops and oil rings.This is proved by well Sha 51 drilled later.
GEOLOGIC FEATURES OF YANCHENG NATURAL GAS ACCUMULATION AND THEIR SIGNIFICANCE TO EXPLORATION
HOU Jian-guo, CHEN An-ding, XIAO Qiu-sheng, WANG Wen-jun
2001, 23(2): 183-185. doi: 10.11781/sysydz200102183
Abstract(581) PDF-CN(376)
Abstract:
The discovery of Yancheng natural gas accumulation is tortuous and enlightening. The analysis on the basic geochemical characteristics of natural gas accumulation, the types of natural gas and its source rocks, and the maturity of natural gas shows that Yancheng natural gas accumulation is a type of "Paleozoic-generating and Cenozoic-reserving" late-accumulating one. This discovery provides a geologic model for the exploration of "Paleozoic-generating and Cenozoic-reserving" and "Paleozoic-generating and Mesozoic-reserving" typed natural gas accumulation in North Jiangsu area. It can also be used for reference in the exploration of the Meso-Paleozoic marine strata in Yangtze area.
GEOCHEMICAL EFFECTS OF CRUDE OIL MIGRATION IN THE NORTH TARIM BASIN, XINJIANG
QIAN Zhi-hao, CAO Yin
2001, 23(2): 186-190. doi: 10.11781/sysydz200102186
Abstract(581) PDF-CN(300)
Abstract:
Some successes were achieved when six new migration parameters of light hydrocarbon fingerprints for crude oil as well as lighter heavy hydrocarbon, biomarkers and other migration parameters were applied to the geochemical effect study of crude oil migration in North Tarim area. The hydrocarbon generated in the Late Hercynian is all related to the Ordovician source rocks reflected from its migration indexes. It must be the product of a large scale lateral migration northward along the Hercynian plane of unconformity from the oil source regions of the Awati and Manjiaer Depressions to the Shaya Uplift. The migration indexes show that the hydrocarbon generated in the Himalayan not only is related to the Ordovician source rocks but also has some relations with the Triassic-Jurassic source rocks. It can also accept continental hydrocarbon lateral migration southward from the Kuche Depression on the north.
PRELIMMINARY ANALYSIS ON THE OIL SOURCES OF THE WEST TAIBEI SAG IN THE TURPAN-HAMI BASIN
WEI Yan-zhao, DAI Jin-xing, ZHAO Chang-yi
2001, 23(2): 191-194. doi: 10.11781/sysydz200102191
Abstract(592) PDF-CN(411)
Abstract:
The Turpan-Hami Basin is the only one discovered in China whose hydrocarbon is dominated by coal related oil. The Taibei Sag is the major one of the basin, and is also the one in which the most amount of hydrocarbon is discovered. Having the hill tectonic zone as the boundary, the Taibei Sag can be divided into the west and the east two parts. The eastern crude oil has the typical characteristics of coal-related oil, and the characteristics of the western crude oil are between lake facies oil and coal related oil. To look at the surface, the western crude oil possesses the characteristics of mixed sources; but the analysis on the carbon isotope, the ratio of saturated and aromatic hydrocarbons and the ratio of pristane and phytane for crude oil shows that the distributive ranges of these indexes for the western crude oil are obviously small than those for the eastern crude oil. Therefore, the western crude oil cannot consist of lake facies oil mixed with coal-related oil; it may be formed in the Middle-Lower Jurassic lake facies mudstone whose features are between typical lake facies mudstone and coal measure source rocks. According to the comprehensive analysis of petroleum geology, the pre-Jurassic hydrocarbon source rocks in the Shengbei Subsag are not the oil sources of the western crude oil in the Taibei Sag.
LONGITUDINAL CHANGING REGULARITY OF HYDROCHEMISTRY FOR THE SOUTHERN EDGE AND HINTERLAND OF THE JUNGGAR BASIN
DONG Wan-bai, LIN Yan-ping, GAO Hong
2001, 23(2): 195-199. doi: 10.11781/sysydz200102195
Abstract(446) PDF-CN(299)
Abstract:
The change of longitudinal hydrodynamicconditions can have great effects on the migration and accumulation of formation liquid. The relatively stagnant environment with weaker hydrodynamic force is advantageous to the preservation of gas and oil. On the contrary, the relatively open environment with stronger hydrodynamic force is disadvantageous to the preservation of gas and oil. In this paper, the hydrochemical section types of Cainan area and Shixi area as well as the hinterland and southern edge of the Junggar Basin are analysed using formation water's salinity, water type, ratio of Na+ and Cl-, and coefficient of desulfurization. The result reveals that the characteristics of positive type hydrochemical sections are shown in whole area, but reverse type and multi type sections do exist in some regions; there exists regions with stronger hydrodynamic force in deep strata with weaker hydrodynamic force and exists regions with weaker hydrodynamic force in shallow strata with stronger hydrodynamic force, and this is advantageous to the preservation of gas and oil; either positive type or reverse type or multi type hydrochemical sections, the preservation of gas and oil will be better provided the salinity of formation water is high and the change of sections is slower, otherwise the preservation of gas and oil will be bad if the change of sections is strong.
RELATIONSHIP BETWEEN DENSITY OF ZnCl2 SEPARATION LIQUID AND Tmax OF PYROLYSIS FOR COAL SAMPLES
SUN Li-chung, TSAI Louis L., YANG Chung-lin, SHIEH Ming-fa
2001, 23(2): 200-202. doi: 10.11781/sysydz200102200
Abstract(676) PDF-CN(223)
Abstract:
The influence of density of ZnCl2 separation liquid, used for maceral separation, to Tmax of Rock Eval pyrolysis was studied in this research. High volatile bituminous coal samples were collected from Yufeng Mine in Sanhsia, North Taiwan. The coal samples were crushed and then immersed in ZnCl2 solution with five different density of 1.12-1.28g/cm3. Half of the immersed samples were dried after thorough water washing, another half of the immersed samples were dried without washing. All of the samples were run by Rock Eval pyrolysis afterwards. The results indicate that Tmax decreases with increasing density of ZnCl2 solution for unwashed samples. On the other hand, Tmax is rather stable for wased samples. It seems ZnCl2 solution has somekind of catalytic effect on Tmax, although Tmax is still the most stable parameter in pyrolysis.
ARTIFICIAL NEURAL NETWORK SIMULATION ON HYDROCARBON MIGRATION AND ACCUMULATION
WU Chong-long, LIU Hai-bin, MAO Xiao-ping, LI Shao-hu, WANG Xie-pei, WU JING fu, HE Da-wei, ZHANG Yun-fei, PAN Ming-tai
2001, 23(2): 203-212. doi: 10.11781/sysydz200102203
Abstract(740) PDF-CN(504)
Abstract:
There are full of chaos and nonlinear characters in basin evolution, petroleum system evolution and hydrocarbon migration and accumulation, so it is impossible to simulate and evaluate the course of hydrocarbon migration and accumulation by simple using the traditional underground hydrodynamic equation. In this paper, the authors discuss the approaches and methods of how to combine the traditional dynamic simulation and artificial neural network simulation; that is, based on the dynamic simulation of the three dimension structure-sedimentary modeling, the authors use the unit entity model to alter the heterogeneous complex passage system into limited simple homogeneous body, calculate the facies and the drive forces of hydrocarbon through the traditional dynamic simulation, and solve such problems as the direction, velocity and quantity of hydrocarbon migration between the unit body by using the artificial neural network technology. A simulation software had been developed under this way. This software had been used to simulate hydrocarbon migration and accumulation in the Zhusan Depression. We got a good result which could well open out the complex mechanism and course of the secondary hydrocarbon migration and accumulation.
HOW TO ELIMINATE THE DEFECTS OF GCF APPLIED TO THE PRODUCTION-PARTITIONING CALCULATION OF CRUDE OIL IN CONPRODUCING WELLS
ZOU Yu-zheng, CAI Yuan-ming, MA Ting, MEI Bo-wen
2001, 23(2): 213-220. doi: 10.11781/sysydz200102213
Abstract(664) PDF-CN(346)
Abstract:
As an important technique in the reservoir geochemical domain,the gas chromatographic fingerprints technique (GCF) has made great contribution to the administration and development of oilfields.GCF has won initial success when applied to the production-partitioning calculation of crude oil in conproducing wells.But many defects as follows were revealed during its application.(1) As GCF is affected by noise unavoidably,the requirements for the stability of instruments are very strict.(2) the amount and velocity of inlet samples must be kept identical on the whole.(3) The determination of peaks is relatively difficult for biodegraded oil without n alkane.(4) The peak height is greatly affected by the integration method the operator selects.(5) As the "standard plate" method established on the basis of absolute linear stacking has not strict universality,the approximation has defects theoretically and correct results cannot be obtained usually by means of conventional mathematical methods.(6) The questions about trilayer conproduction have not been resolved better.About its theoretical defects,it is proved by strict mathematical deduction that there is no linear stacking relationship between peak height ratios and production-partitioning percentages.Furthermore,the internal standard method and the bias least square method two improving schemes aimed at the above defects were suggested,and the later scheme was studied and discussed emphatically and thoroughly.By improvement on original GCF,the absolute error between predicted and measured values for artificial partition mixed oil is less than 5%. This proved the accuracy and reliability of the later scheme.The comparison of the calculation results from the later scheme with those from the ultraviolet spectral technique (UV) for the same conproducing well shows that the two methods have quite good coincidence and comparability.At last,the respective appliable ranges of GCF and UV two techniques are discussed in detail.As the two techniques are mutually complementary,we must make selections according to concrete conditions in the course of application.
COMBINED APPLICATION OF SEM AND IMAGE ANALYSIS IN THE STUDY OF RESERVOIR
CAO Yin, ZHU Ying, LI Qiong
2001, 23(2): 221-225. doi: 10.11781/sysydz200102221
Abstract(565) PDF-CN(425)
Abstract:
In this paper, a new generation of scanning election microscope (SEM) and an energy spectrometer (ES) with the function of image analysis are combined used to analyse sandstone and cast sandstone. As SEM has the features of large field depth, strong relief perception and high resolution, the analysis of sandstone can use the secondary electron imagery and the back scatter imagery two methods respectively. By these methods, not only the intergranular pores, intergranular cement, throat connection, and coordination number of sandstone can be obtained, but also porosity factors can be calculated rapidly and quantitatively by means of image analytical software. The various information obtained combined with other data makes it possible to evaluate the reservoirs of specific areas.
DECISION SYSTEM OF HYDROCARBON RESOURCE EXPLORATION——A PRELIMINARY APPROACH TO THE EVALUATION OF EXPLORATION, DEVELOPMENT AND MARKETS AS A WHOLE
ZHANG Ji-liang
2001, 23(2): 226-229. doi: 10.11781/sysydz200102226
Abstract(623) PDF-CN(285)
Abstract:
In this paper, the importance of exploration decision and the theory and method of decision are discussed. it is established that economic benefits are the priorest decision norm of all. Also, the decision system of hydrocarbon resource exploration with the core of economic benefits, the bases of statistics, information and controls and the method of dynamics, which makes exploration, development and markets as a whole, is introduced.
SEVERAL METHODS OFTEN USED IN CONSULTING PETROLEUM　GEOLOGICAL LITERATURE
XU Wen-ming
2001, 23(2): 230-231. doi: 10.11781/sysydz200102230
Abstract(636) PDF-CN(208)
Abstract:
The paper summarizes the characteristics of petroleum geological literature in IT age, and introduces several methods and retrieval tools currently used in searching for petroleum geological literature.
ESTABLISHMENT AND DEVELOPMENT OF “CHINESE TAPHROGENY OUTLOOK”
LUO Zhi-li, ZHAO Xi-kui, LIU Shu-gen, YONG Zi-quan
2001, 23(2): 232-241. doi: 10.11781/sysydz200102232
Abstract(624) PDF-CN(383)
Abstract:
The viewpoint "Chinese three times of taphrogeny" has evoked widespread repercussions in geological circles and society since it was founded in 1981. Based on great amount of related information at home and abroad in recent 20 years, the promotion of the academic standpoint of taphrogeny to the development of Chinese geological scientific theories, the formation and practical examination of the dualistic theory of continental oil generation, the effectiveness of the standpoint of Emei taphrogeny to the prediction of reef segment-typed gas pools in the Sichuan Basin, and the interpretation of accumulation regularities for coal-enriched zones in Southwest China and structural settings for the deposit-formation of some metallic minerals by this viewpoint are summarized. Furthermore, three aspects of experience on the development of Chinese basic geological sciences and related applied sciences are expounded, and the direction and prospects for the "Chinese taphrogeny" research are forecasted.
CORRECT EVALUATION AND PREDICTION BASED ON THE COMBINATION OF POSITIVE AND REVERSE THINKING
WANG Jin-qi
2001, 23(2): 242-245. doi: 10.11781/sysydz200102242
Abstract(536) PDF-CN(248)
Abstract:
More than 40 years of anthor's exploration practice reveals that correct evaluation and prediction must be based on the combination of positive and reverse thinking. Simple positire thinking, which stresses to look for gas according to hydrocarbon sources and neglects natural gas activities, once resulted in slow reacting and faults on shallow hydrocarbon. From tortuous exploration experience and deep introspection of the west Sichuan Depression, the unique regularities of gas pools in ultra dense areas are mastered step by step, and the paleozoic Tahe oilfield and the C P ordos deep basin gas are predicted accurately during the evaluation of oil and gas areas in China. It is essential to make hydrocarbon prediction on the basis of ample data and using conventional positive thinking. The deeper the thinking is, the strorger the evaluation and prediction function are. Line type positive thinking often runs into a stone wall, because the collected data for deep hydrocarbon are still odd scraps and discontinuous. If they are linked up by positive thinking, they may be images from some angle even false appearances. And if using analysis, hypothesis, disproof and simulation carefully or using the correlation to succeed models as well as often using the way of reverse thinking, they can be even more approaching to reality.
2001, 23(2): 246-248. doi: 10.11781/sysydz200102246
Abstract(527) PDF-CN(348)
Abstract:

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