石油实验地质

2001, 23(1): 3-7. doi: 10.11781/sysydz200101003

Abstract(572) PDF-CN(649)

Abstract:

INDOSINIAN TURKIC-TYPE OROGEN BORDERING YUNNAN AND GUANGXI：WITH REFERENCE TO COUPLED BASIN EVOLUTION

Wu Genyao, Ma Li, Zhong Dalai, Wu Haoruo, Ji Jianqing, Kuang Guodun, Xu Keding

2001, 23(1): 8-18. doi: 10.11781/sysydz200101008

Abstract(670) PDF-CN(862)

Abstract:
The Babu-Phu Ngu ocean bordering China and Vietnam separated the Vietbac Block from the Huanan (South China) Subcontinent,with rifting started from the Devonian.The oceanic crust must have been created in Early Carboniferous,evidenced by the Sm-Nd isochron age of 328.3 Ma from the ophiolite,and in the oceanic basin some submarine plateaus occurred on which the shallow marine carbonate rocks deposited during Late Paleozoic.Beginning from the Early Permian the ocean subducted southwestwards,with the magmatic arc migrating toward the ocean.Correspondingly,the passive continental margin migrated northeastwards.The southwestward subduction and arc migration toward the northeast kept on in Early-Middle Triassic,when the passive continental margin inverted to foredeep where flysch formation well developed in areas bordering Guangxi-Guizhou.During the subduction,the carbonate rocks on submarine plateaus,plus the volcano-sedimentary rocks of active continental margins,were accreted onto the Vietbac Block.In Late Triassic,the accreted Vietbac Block collided the Huanan Subcontinent,and the accreted volcano-sedimentary wedges obducted the latter.The molasse deposits (the Erqiao Formation) occurred accompanying with the collision,but now preserved in the central Guizhou only.The stacking up of crustal wedges resulted in the thickening of continental crust,and the orogenic area uplifted and eroded in Juro-Cretaceous.The lithospheric delamination and related collapse rifting might hardly occurred,since the collision did not occur between two lithospheric plates.In short words,the Paleotethysides bordering Yunnan and Guangxi may have been a Turkic-type orogen,which controlled developing of the coupled basins both in continental margins and intracontinental (intracratoi nic) ones.The examples from Guizhou as well as Hunan and east Sichuan revealed that the change of tectonic regime (from sea-floor spreading to oceanic subducting) resulted in a regional compressive stress field and a group of comtemporaneous folds constraining intracratonic sedimentation.Based on analysis of relation between the orogenesis and coupled basin developing,the potential areas for oil-gas exploration are suggested as follows:1) The underthrust and buried marine Upper Paleozoic deposited on the Huanan Subcontinent,especially,to the northeast side of the Youjiang fracture;2) the buried Triassic sediments in the foredeep and foreland basins,as well as the Upper Paleozoic on the South Guizhou Slope.

FORMATION AND EVOLUTION OF THE BAYANHAOTE PROTOTYPE BASINS

Xiong Baoxian, Chen Wenxue, Chen Wenli, Cao Xinyan

2001, 23(1): 19-22. doi: 10.11781/sysydz200101019

Abstract(704) PDF-CN(570)

Abstract:
The Bayanhaote Basin is an important basin to which the exploration of hydrocarbon is strengthened in recent years.It is located in the juncture of three tectonic units,that is,the Alashan Massif,the Ordos Massif and the Hexi Corridor in termediate zone.It is a compound and superimposed basin formed from different periods and many times of tectonic movement reformation.Its formation is closely related to the specific geotectonic location it lies.Starting with regional tectonic characteristics,the prototypes of the Bayanhaote Basin and their evolutionary characteristics in differnt geological historical periods are analysed and summarized thoroughly.The authors considered that the Bayanhaote Basin and its peripheral regions experienced the evolutionary stages of the Early-Middle Proterozoic Qin-Qi-He Trigeminal Rift,the Late Proterozoic-Cambrian Ordovician Aulacogen,the Silurian Devonian Foreland Basin,the Carboniferous-Permian Compound Basin and the Mesozoic-Cenozoic Fault Basin.

STRUCTURAL CHARACTERISTICS AND FAVORABLE BELT FOR HYDROCARBON EXPLORATION IN SANTANGHU BASIN

Sun Ziming, Xiong Baoxian, Li Yonglin, He Huiqiang

2001, 23(1): 23-26. doi: 10.11781/sysydz200101023

Abstract(501) PDF-CN(587)

Abstract:
Santanghu Basin,located in the northeast Xinjiang,is a medium-sized composite hydrocarbon basin juxtaposing and superimposing relict basins formed in different stages.It has two tectonic evolutionary stages of foreland basin and intracontinental basin that is further divided into three periods of intracontinental rift,newborn foreland basin and dying out basin.The extensive thrusting movements happened at the end of every evolutionary stage,which lead to deformation of sedimentary layers and formation of many enclosures.The southern Tiaohu sag and the southern Malang sag,located in the favorable belt of overthrusting hydrocarbon generation system,are favorable areas for petroleum exploration.

ON DYNAMICS OF THE BOHAI BAY COMPLEX FAULTED BASIN

He Bin

2001, 23(1): 27-31. doi: 10.11781/sysydz200101027

Abstract(567) PDF-CN(564)

Abstract:
Bahai Bay Basin,formed during the Meso-Cenozoic,is a typical complex faulted basin in eastern China.Based on the tectonic framework,structural style,tectonic transport and deep geophysical data of the basin,its dynamics was discussed.It was suggested that formation and evolution of the basin was resulted from superimposition and compounding of two dynamic systems in time and space,which were relative independent and co-exist in space.One was regional extension system trending NW-SE and another was N-S trending pull apart or strike-slip system resulted from Tanlu fault zone.

AN ASSESSMENT OF HYDROCARBON POTENTIAL OF MESOZOIC-CENOZOIC BASINS IN THE NORTH PART OF KASHEN DEPRESSION OF TARIM BASIN

Qian Yixiong, Ji Rangshou, Qin Deyu, Liu Guangxiang, Pan Wenlei

2001, 23(1): 32-37. doi: 10.11781/sysydz200101032

Abstract(525) PDF-CN(587)

Abstract:
On the base of concept of petroleum system,the authors made a concise description of Jurassic petroleum system in the north part of Kashen depression with regard to its essential geological elements and principal process,and pointed out emphatically an important role for analysis of background of sedmentary basin played in petroleum system studies.Meanwhile,the authors believed that the potential area for hydrocarbon exploration could be placed on surrounding of Wuque and extending to 30km eastward,and deep structure and overlapped trips should be taken into account in selection of exploration targets.

TYPES OF STRATIGRAPHIC-LITHOLOGIC TRAPS IN THE MAIGAITI SLOPE

Fan Ming, Zheng Bing

2001, 23(1): 38-40. doi: 10.11781/sysydz200101038

Abstract(573) PDF-CN(528)

Abstract:
In this paper,the drilling and seismic profile data of the Maigaiti slope in the Tarim basin are studied and analysed in detail,the stratigraphic-lithologic traps in this region are searched,and the types of the traps are pointed out.This lays a foundation for hydrocarbon exploration in the future.

EVALUATION ON THE GEOLOGIC CONDITIONS OF THE LOWER PALEOZOIC HYDROCARBON IN LOWER YANGTZE AREA

Yu Kai, Guo Nianfa

2001, 23(1): 41-46. doi: 10.11781/sysydz200101041

Abstract(618) PDF-CN(562)

Abstract:
The Lower Paleozoic in Lower Yangtze area which has developed hydrocarbon source rocks,organic matter with high thermal evolutionary degree and good reservoir-cap conditions possesses favorable geologic conditions to form large scale natural gas pools.The Indosinian movement greatly reformed the tectonics of the Lower Yangtze sea basin sedimentary body,and has some degree of katogene on oil and gas pools.But the Lower Paleozoic oil and gas pools have advantageous preservation conditions because of the sealing and covering of very thick mudstone in the Gaojiabian Formation of the Lower Silurian.Therefore,as for the evaluation of hydrocarbon exploration domain,the Lower Paleozoic is obviously superior to the Upper Paleozoic and the marine Paleozoic.

BASIC GEOLOGIC CHARACTERS OF THE ABNORMAL FORMATION OVERPRESSURE IN THE WESTERN PART OF SOUTHERN FRINGE OF JUNGGAR BASIN

Li Zhongquan, Chen Gengsheng, Guo Jiyi, Chi Yuanlin, Zhao Jie, Zhu Defeng, Liu Jie, Ai Xingbo

2001, 23(1): 47-51. doi: 10.11781/sysydz200101047

Abstract(631) PDF-CN(536)

Abstract:
The abnormal formation overpressure in the western part of southern fringe of Junggar Basin mainly existed in the secound and third row of structural zones in northern Tianshan piedmont fold zones,and were characterized by regional zonal distribution.According to drilling data revealed,formation overpressure were characterized by "strata-control and time-control",which showed that the depth of the top surface of abnormal overpressure was controlled by Anjihaihe formation (E₂₊₃),and its 3-D shape was a irregular box,which has the character of overpressured compartment.And its forming mechanism is "polygenetic",which was formed by superimposing of sedimention and tectonic.

RESTORATION OF THE LOWER CRETACEOUS DENUDED THICKNESS IN THE SANTANGHU BASIN AND ITS EFFECT ON HYDROCARBON GENERATION

Xie Zhiqing, Yan Xiaoxiong, Zhou Lifa

2001, 23(1): 52-55. doi: 10.11781/sysydz200101052

Abstract(579) PDF-CN(535)

Abstract:
In this paper,the mudstone acoustic time difference method and the vitrinite reflectance method are used to calculate the Lower Cretaceous denuded thickness in the Santanghu basin.The results from the two methods fit well.It is revealed that the Lower Cretaceous denuded thickness is between 300m to 700m,and the denuded thickness increases from west to east.The Cenozoic sedimentary thickness,which is smaller than the Lower Cretaceous denuded thickness,cannot make up heat losses caused by denudation.Therefore,the Late Yanshanian movement played a destroying role in the generation of hydrocarbon.

STUDY ON THE POOLING MECHANISM OF THE WENJISANG HYDROCARBON ACCUMULATION ZONE IN TURPAN DEPRESSION

Luo Hongjun, Xu Shubao, Yang Maoyuan, Wang Pengzhi

2001, 23(1): 56-61. doi: 10.11781/sysydz200101056

Abstract(463) PDF-CN(445)

Abstract:
The Wenjisang hydrocarbon accumulation zone is one of the main accumulation zones in Turpan Depression.Hydrocarbon was resulted from two periods of hydrocarbon generation and expulsion of the same set of source rocks in the area.During the Middle Yanshanian movement phase,the source rocks in Qiudong sag entered threshold of hydrocarbon generation,and dominately generated light oil.It was migrated to Wenjisang structural zone within the sag along fault.At this time Qiudong anticline was not formed and oil was migrated from north to south with oxidizing as a main change during migration.During the Himalayan movement phase Qiudong sag and Wenjisang structural zone were deeply buried and source rocks mainly generated condensate gas.At the same time,Qiudong anticline was formed as a result of regional compression.The condensate gas was migrated from north to south with bed absorbing process.Due to only condensate gas was captured,a pure condensate gas field was formed in Qiudong anticline.But Miden anticline only accumulated condensate gas in the deep part as it had captured light oil generated during Yanshanian period.

CHARACTERISTICS OF CLASTIC RESERVOIRS IN THE TARIM BASIN

Wang Genchang

2001, 23(1): 62-66. doi: 10.11781/sysydz200101062

Abstract(651) PDF-CN(566)

Abstract:
This paper deals with the characteristics of petrology,genetic type and distribution of sand bodies,diagenesis and diagentic evolution,genetic type of porosity and reservoir property of Silurian-Tertiary clastic reservoirs in the Tarim Basin.It was considered that Suweiyi Formation (Miocene),Upper Cretaceous,Lower Tertiary,Upper to Middle Triassic and Donghe Sandstone (D_3d) in Northern Tarim Basin,Donghe Sandstone in Central Tarim Basin,and Miocene,Lower Cretaceous in Southwestern Tarim Basin were the best reservoirs,and giant to middle oil and gas fields could be formed in those reservoirs.It was also pointed out that the deep buried reservoirs such as Triassic and Donghe sandstones with favorable reservoir property were rare in the world.Their formation conditions were analysed in detail.

MICROFACIES RHYTHMIC CHARACTERISTICS OF FUTE CONGLOMERATIC OIL POOL AND THEIR EFFECTS ON DEVELOPMENT

Liang Guanzhong, Zhang Manku, He Guoan

2001, 23(1): 67-71. doi: 10.11781/sysydz200101067

Abstract(504) PDF-CN(508)

Abstract:
On the basis of core observation and description,the depositional microfacies of Fute conglomeratic oil pool are divided and their rhythmic characteristics are studied by the comprehensive application of well logging interpretation data.It is considered that the district received clastic sediments from two matter source directions during the Asan sedimentation period and formed two completely different reservoir rock bodies.Between them,the master conglomeratic reservoir rock body,which belongs to fan delta frontal deposit,can be further divided into six microfacies.Different depositional microfacies have different extension,physical properties and reservoir developing degree for sand bodies,and possess distinct rhythmic patterns;and reservoirs with different depositional microfacies and rhythmic characteristics have different development features.Plane oil-water movement regularities are mainly controlled by depositional microfacies,while longitudinal oil-water movement regularities are mainly affected by the rhythmic patterns of permeability.At last,rational readjustment suggestions about the injection-production wells and measures of the oil pool are advanced by use of microfacies and rhythmic pattern study achievements,and good effects are obtained.

A STUDY ON RESERVOIR DESCRIPTION METHOD AND ITS APPLICATION FOR UPPER TERTIARY IN THE WESTERN AREA OF SHANJIASI

Lin Songhui, Wang Hua, Wang Genfa, Wang Xingmou, Zhang Guixia, Chen Haiyun

2001, 23(1): 72-77. doi: 10.11781/sysydz200101072

Abstract(477) PDF-CN(502)

Abstract:
The Upper Tertiary in western area of Shanjiashi in Dongying was deposited in the period of depression development,the overlaping or draping reservoir was formed in Guantaozu Formation,and the lenticular lithologic gas pool was formed in Minghuazhen Formation.Based on reservoir features of thin layer and small scale,many techniques including geophysical exploration were used to the study of reservoir formation and distribution,as well as pool-forming conditions.The possibility of hydrocarbon-bearing in the reservoirs was predicted.The reservoir description method for the Upper Tertiary in the area may provide some guidings for hydrocarbon exploration and development in other area.

APPLICATION OF FAULT SEALING TO THE BOUNDARY DIVISION OF PETROLEUM SYSTEMS

Ma Lixiang, Lu Youming

2001, 23(1): 78-83. doi: 10.11781/sysydz200101078

Abstract(588) PDF-CN(547)

Abstract:
The qualitative and quantitative study of fault opening or sealing and the analysis of petroleum systems are two fashionable research subjects in the domain of petroleum exploration at present.In the study of petroleum systems,the division of petroleum systems is critcal.It has very important significance to the objective evaluation of resource potential for petroleum systems and to the determination of favorable zones and traps for exploration.With the sealing or opening of faults,the geographic distributive ranges of petroleum systems decrease or increase,and the evaluation on the potential of petroleum exploration changes correspondingly.It this paper,the present situation of fault sealing research is reviewed,and it is applied to the analysis of petroleum systems in the Bachu uplift of the Tarim basin.

QUANTITATIVE ANALYSIS ON THE CHEMICAL STRUCTURES AND HYDROCARBON-GENERATING CHARACTERISTICS OF MONOMACERALS IN COAL SOURCE ROCKS

Li Rongxi

2001, 23(1): 84-86. doi: 10.11781/sysydz200101084

Abstract(639) PDF-CN(558)

Abstract:
In this paper,Micro-FTIR is used to analysed and test fluorescence vitrinite,cutinite and resinite in a coal source rock sample,and their chemical structures and hydrocarbon-generating characteristics are quantitative analysed and studied by means of the IR partition chromatographic technology and the computer curve-fitting method.The results show that vitrinite has more C=O structure,and cutinite and resinite two have more aliphatic hydrocarbon structure (CH₂+CH₃);the chemical structures of monomacerals in coal rocks decide that they have different hydrocarbon-generating characteristics,that is,vitrinite mainly generates gas,cutinite and resinite mainly generates oil,and vitrinite and resinite have the feature to generate hydrocarbons and form low-mature oil in the earty stage.

STUDY ON THE HYDROCARBON PRODUCTION RATE MODEL OF LOW-MATURE OIL

Lin Yuxiang

2001, 23(1): 87-92. doi: 10.11781/sysydz200101087

Abstract(586) PDF-CN(542)

Abstract:
Based on the genetic study of low-mature oil,the results of simulation experiments and the natural evolutionary profiles of organic matter,it is pointed out that low-mature oil is in fact a by-product during the diagenetic evolution of organic matter.In the diagenetic stage,the production rate and cumulative production rate of low-mature oil generally have on hydrocarbon-generating (or oil-generating) peaks with the increase of maturity.This is distinct from the hydrocarbon-generating (oil-generating) pattern of kerogen in the plutonic stage of organic matter.The hydrocarbon production rate and cumulative production rate of low-mature oil mainly depend on the original hydrocarbon content in primary mother material,the hydrocarbon trapping during the formation of kerogen,the low-temperature decomposition of part large geologic moleculars,the components of rock mineral and other factors.In this paper,the popular hydrocarbon-generating (oil-generating) patterns of low-mature oil are supplemented and modified.

COMPREHENSIVE STUDY ON THE GEOCHEMISTRY OF THE JURASSIC EXPOSED SOURCE ROCKS IN THE GESI FAULT TROUGH

Gan Guiyuan, Yin Chengming, Zhang Peng, Zhu Yeqian, Chen Dengqian, Cui Jun

2001, 23(1): 93-96. doi: 10.11781/sysydz200101093

Abstract(499) PDF-CN(547)

Abstract:
In recent three years,important achievements have been obtained from many times of petroleum geological investigation and comprehensive research.Oil sand is discovered in the Tertiary sandstones and the Jurassic carbonate rocks.The Jurassic and Tertiary megathick strata is outcropping from ground.Hydrocarbon source rocks are mainly black argillaceous rocks and carbonate rocks distributed in the Middle-Lower Jurassic (J₁₊₂) strata.Argillaceous source rocks make up 32.8-46.1 per cent of the Middle-Lower Jurassic stratum thickness,while cardonate source rocks,which are mainly developed in Heishuigou region,amount to 30.5 per cent.Comprehensive study on the analytical results of outcropped surface samples show that argillaceous source rocks are good hydrocarbon source rocks with the good types,high abundance and high maturity of organic matter,and carbonate source rocks are the best with the well types,high abundance and high maturity of organic matter.Widespread argillaceous source rocks are the most major hydrocarbon source rocks in the Gesi Fault Trough,and carbonate source rocks mainly distributed in the east are important hydrocarbon source rocks.

MULTIKINETIC MODELLING FOR TIME-TEMPERATURE HISTORY BASED ON APATITE FISSION TRACK DATA

Zhou Zuyi, R Donelick

2001, 23(1): 97-102. doi: 10.11781/sysydz200101097

Abstract(596) PDF-CN(648)

Abstract:
A new parameter,D_par,which is the arithmetic mean etch figure diameter parallel to the C-axis at the etched surface,can describe effectively the annealing behavior of apatite fission tracks.Apatite grains from a single sample can be divided into different kinetic populations according to their measured D_par values.The time-temprature history modelling based on apatite fission track data can therefore be developed into a multikinetic modelling system consisting of several independent apatite thermochronmeters.Consequently,the modelling result is more practical and accurate.Four examples from different Chinese sedimentary basins are shown at the end of the paper.

3-D VISUALIZATION TECHNIQUE AND ITS APPLICATION IN SEQUENCE STRATIGRAPHIC ANALYSIS

Zheng Xiaowu, Yuan Shiyi, Mu Longxin, Song Xinmin

2001, 23(1): 103-107. doi: 10.11781/sysydz200101103

Abstract(530) PDF-CN(687)

Abstract:
Some new technology should be used to solve the complex problem of stratigraphic correlation in reservoirs.The 3-D visualization is a method of voxel-based seismic volume interpretation.The structural,stratigraphic and lithologic features can be identified directly from the 3-D seismic volume.It has a great advantage especially on sedimantary system analysis.The 3-D visualization technology combined with the method of sequence stratigraphic analysis was used in the complex stratigraphic correlation in a field,and a very good result has been received.

EXPERIMENTAL STUDY ON THE DIFFUSION COEFFICIENTS OF NATURAL GAS

Li Haiyan, Fu Guang, Peng Shimi

2001, 23(1): 108-112. doi: 10.11781/sysydz200101108

Abstract(497) PDF-CN(546)

Abstract:
Based on the analysis of the measuring principle of natural gas diffusion coefficients,the authors assembled by themselves a temperature-controllable measuring apparatus of natural gas diffusion coefficients.This apparatus can determine the natural gas diffusion coefficients of rocks under the conditions of high temperature and high pressure,and can well simulate the conditions of strata.By use of this apparatus,the diffusion coefficients of natural gas when it passes through thirteen dried artificial quartz siltstone samples and water-saturated rock samples are determined separately.Using the integral formula of the Fick Law and the Van der Waals Equation of gases,it is determined that the conversion coefficient of measured natural gas diffusion coefficients in the conversion of medium-saturated conditions is 6.06.The measured diffusion coefficients of natural gas is corrected in temperature by the Stocks-Einstein Equation.After correction,the natural gas diffusion coefficients under the conditions of strata are all smaller than measured values,and the difference between them decreases gradually with burial depth.This is because that the movement of natural gas moleculars is accelerated with the increase of burial depth and geotemperature.It indicates that the corrected results ard fit for the conditions of strata.

2001 Vol. 23, No. 1

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