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1998 Vol. 20, No. 2

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EVOLUTION OF THE SOUTH ANHUI OROGEN AND ITS SIGNIFICANCE FOR EXPLORATION OF OIL AND GAS FIELDS
Chen Guanbao, Xu Shutong, Zhang Yuchang, Tao Zheng, Shi Yonghong
1998, 20(2): 103-109. doi: 10.11781/sysydz199802103
Abstract(786) PDF-CN(364)
Abstract:
Whether the distributive province of shallow metamorphic rock in South Anhui is an old land or an orogen is an important problem controverted over for a long time in the geotectonic study of South China.The latest research data indicate that it is an orogen composed of Palaeozoic metamorphic strata rather than an old land.The tectonic composition and evolutionary history of this orogen are also discussed in the meantime in this paper.At last,the significance of the evolutionary history for the exploration of oil andgas fields in the area and the further work needed are suggested.
PROSPECT OF PETROLEUM FRONTIER IN THE MID-SMALL SIZED MESOZOIC BASINS, NORTH CHINA：A VIEW OF PETROLEUM ACUMULATION CONDITION
Fan Xiaolin
1998, 20(2): 110-115. doi: 10.11781/sysydz199802110
Abstract(784) PDF-CN(339)
Abstract:
The suitable paleoclimatic and paleogeographic condition in the Jurassic-Cretaceous period provided a favourable depositional environment for formation of hydrocarbon-bearing basins in the north of QinglinQilian-Kunlun orogenic belt.The Yanshanian tectonic activity was strong in the end of the Jurassic and the end of the Cretaceous,which resulted in inversion of basins and formation of two petroleum systems of the Early-Middle Jurassic and the Late Jurassic-Early Cretaceous.Accumulation was formed in late Yanshanian and Himalayan movement.It was pointed out that hydrocarbon was sourced from the Lower and Middle Jurassic coal-bearing sequence via vertical or lateral migration in the mid-small Mesozoic foreland basin in northwestern China,and hydrocarbon was sourced from the Upper Jurassic-Lower Cretaceous coal-bearing sequence in faulted basins in northeastern China.The related accumulations formed in those areas are the potential targets for exploration.
THE FORMATION AND EVOLUTION OF THE BAOSHAN BASIN, YUNNAN PROVINCE
Dai Sulan, Liu Shugen, Zhao Yongsheng, Zhao Zejiang, Gao Fangzhen, Wu Shilin, Mou Fengrong
1998, 20(2): 116-123. doi: 10.11781/sysydz199802116
Abstract(809) PDF-CN(307)
Abstract:
The Baoshan basin is a typical Tertiary basin in west Yunnan Province,which is composed of western fault zone,central sag zone and eastern slope zone.The extenslonal quantity is from small,to big and to small from the north to the south of the basin.The extensional history consists of three cycles.Three un conformities can be recognized in the basin.The process of the formation and evolution of the basin can be divided into the primary formation stage,the extensional development stage and the filling stage.
SEQUENCE STRATIGRAPHIC ANALYSIS OF THE TERTIARY IN THE QIONGDONGNAN BASIN
Wang Gengfa, Wu Chonglong, Zhou Jiangyu, Li Shaohu
1998, 20(2): 124-128. doi: 10.11781/sysydz199802124
Abstract(670) PDF-CN(389)
Abstract:
The Qiongdongnan basin involved from a fault basin into a downwarped basin.and is filled with very thick sediments.of this suite sediments,14 sequences can be recognized in the Lower-upper Tertiary.with 6 sequences being formed in faulting stage and 8 being formed in down warping.In faulting stage.the de velopment of sequence was mainly controlled by episodic tectonic movement,and the sequence consists of coarse clastic sediments deposited in alluvial fan,river,lake,fan-delta and clastic littoral environments.In the down-warping stage,the formation of sequence was mainly controlled by global change of sea level.and the sequence is characteristic of typical passive continental margin and includes lower systern tracts.Pro gressive system tracts and high system tracts.The lower system tracts conslsts of basln botton fan.slope fan and submarine channel sediments,and progressive and high system tracts consist of delta system,clastic littoral system,carbonate platform reef system and neurotic shelf systems.
CHARACTERISTICS OF IGNEOUS RESERVOIR AND CONTROLLING FACTORS OF RESERVOIR DEVELOPMENT IN THE PERMIAN OF THE SANTANGHU BASIN
Xiong Qihua, Wu Shenghe, Wei Xinshan
1998, 20(2): 129-134. doi: 10.11781/sysydz199802129
Abstract(573) PDF-CN(410)
Abstract:
The Permian of the Santanghu basin is one of key exploration systems of the region,in which igneous rocks,especially andesite,basalt and their transition types are main reservoir rock types,The storing space are mainly pores and fractures,and,then caves.The types of pores include air pores,residual air pores,in ter-crystal pores in matrix,dissolution pores and residual pore after cement of fractures and caves,etc.Fractures are mainly structural,and then diageneous and weathering in origin.The reservoir spaces experi enced very complex evolution processes,including nine stages:(1)primary pore(air pores and contraction fractures)development;(2)mineral filling up after igneous stage;(3)dissolution near surface;(4)burial filling up in pores;(5)first stage of structural fracture development;(6)cave development;(7)second stage of structural fracture development;(8)later filling up,and(9)dissolution stage.According to the storing space and petrophysical properties,igneous reservoir can be classified into the following three types:reservoir I,porosity 10%~22 %,permeability larger than 10×1O-3μm2,some up to 100×10-3μm2,belonging to pore-fracture-carve composite reservoir and partly pore-fractured reservoir,reservoir Ⅱ,porosity larger than 10%,permeability(1~10)×10-3μm2,belonging to pore-fractured reservoir and partly fractured reservoir,reservoirⅢ,porosity less than 10%,permeability less than 1×10-3μm2,belonging to pore-type reservoir and partly fractured reservoir.The controlling factors of reservoir development are mainly igneous facies,structure fracturing and dessolution.In addition,hydrocarbon invasion is very impor tant in reservation of storing space.
STUDY ON THE DIAGENESIS OF CLASTIC ROCK IN THE KEZILESU GROUP OF THE TARIM BASIN
Li Changcun, Han Xiuli
1998, 20(2): 135-138. doi: 10.11781/sysydz199802135
Abstract(594) PDF-CN(314)
Abstract:
Based on the study of petrology,the diagenesis of sand rock in the Kezilesu Group of the Tarim Basin is studied in detail in this paper by means of Scanning Electron Microscopy(SEM),X-ray Analysis,Cathodoluminescence and Section Staining Method.Combined with the study of fluid inclusion,the stages of diagenesis are divided.
A STUDY OF ACCUMULATION PATTERN IN COMPLEX OIL AND GAS BELTS IN DAWA-HAIWAIHE AREA
Zhang Zehui, Wang Wei, Miao Zhen, Feng Fei
1998, 20(2): 139-142. doi: 10.11781/sysydz199802139
Abstract(571) PDF-CN(309)
Abstract:
On basis of sedimentology,oil field geology,accompanying with drilling well,oil well test and experi mental data,the geological characteristics of complex oil and gas belt in Dawa-Haiwaihe area was analysed and their accumulation pattern was proposed.It was indicated that there were rich source rocks,well de veloped multiple set of reserviors,various traps in the area.Under structural and depositional controls,various hydrocarbon accumulations were widely developed and a complex oil and gas belt with different oil and gas reserviors was formed in the area.
QUANTITATIVE SEISMIC FACIES ANALYSIS AND SANDBODY PREDICTION ON THE UPPER PART OF THE GUANTAO FORMATION(UPPER TERTIARY)IN CHENGDAO OILFIELD
Yang Fengli, Zhou Zuyi, Cai Juhong
1998, 20(2): 143-148. doi: 10.11781/sysydz199802143
Abstract(582) PDF-CN(279)
Abstract:
In this paper,the characteristic seismic parameters of sedimentary facies are calculated from 3-D seis mic data of the study area,the mathematical models of composite sedimentary cycles and single seismic sedimentary subfacies cycles for the upper part of the Guantao Formation(Late Tertiary)in Chengdao oil field are established by means of the Integrated Seismic Parameter Conversion Method and the Monoseis mlc Parameter Method,and the prediction and evaluation on sandbody for sandstone sets and single sand beds are accomplished,respectively.The results yielded are compatible with the practical drilling data ob tained.
UNDULATION ANALYSIS SERVED AS A NEW METHOD TO THE PALEOSTRESSPFIELD STUDY OF A SEDIMENTARY BASIN
Li Jingchang
1998, 20(2): 149-151. doi: 10.11781/sysydz199802149
Abstract(512) PDF-CN(245)
Abstract:
The method of the Undulation Analysis believes that the evolutionary process of a depositional basin is controlled by different cyclic waves.Practical application shows that there are differences between the same types of cyclic waves in the different regions of a basin.In this paper,the causes which result in such differences have been analysed,and the research thinking and method using the differences to solve the paleostressfield problems of basin are suggested.The restoration of Tertiary paleostressfield in the Qaidam Basin by means of this method indicates that the compressive stress spreads from SW220°to NE40°
A NEW METHOD OF PETROLEUM RESOURCES ESTIMATION：FRACTAL METHOD
Zeng Yi
1998, 20(2): 152-154. doi: 10.11781/sysydz199802152
Abstract(533) PDF-CN(340)
Abstract:
With advances of oil and gas exploration,methodology of petroleum resource assessment has been focus on analysis of geological features and on statistics of the exploration data instead of the material ba lance by geochemical data.Application of fractal method to the petroleum assessment may open new idea to geologists,because field sizes of the discovered oil and gas accumulations and the field number are fol lowing a kind of box structure in terms of fractal.This paper introduced a simple fractal method to esti mate undiscovered hydrocarbon reserve on a published data set of the Minnelusa play in the Power River basin,U.S.A.The author believe that the method is applicable in estimation of either petroleum re sources or reserves in China.
APPLICATION OF THE LOGNORMAL MODELLING METHOD IN THE RESOURCE ASSESSMENT OF BURIED HILL-TYPED PLAYS IN THE NORTH TARIM
Liu Yi, Liu Min
1998, 20(2): 155-159. doi: 10.11781/sysydz199802155
Abstract(539) PDF-CN(235)
Abstract:
The Lognormal modelling method is an efficient method for resource assessment and has widely been paid attention to in recent years.The paper details the oil-controled factors,rate of exploration success and the number of planning targets of the buried hill-typed plays in the Lower Paleozoic of the North Tarim,Results of this evaluation reveal not only the total hydrocarbon resources and the remaining play potential but also the number and sizes of undiscovered pools,which provide bases for further development planning.
1998, 20(2): 159-159. doi: 10.11781/sysydz199802159
Abstract(478) PDF-CN(166)
Abstract:
A CASE STUDY OF RELATIONSHIP BETWEEN THE COMPONENT DISTRIBUTION OF TRACE METAL ELEMENTS IN STRATIGRAPHIC WATER AND THE HYDROCARBON ACCUMULATION：YANGDACHENGZI OIL RESERVIOR IN THE SONGLIAO BASIN
Huang Futang, Feng Zihui, Kong Qingyin, Wang Wenguang
1998, 20(2): 160-165. doi: 10.11781/sysydz199802160
Abstract(602) PDF-CN(252)
Abstract:
This paper discussed the components and content distribution of trace metal elements in stratigraphic water.The result shows that the content of various metal elements is Fe>Sr>Zn>Mn>Cu>Ni>Cr in stratigraphic water of the Yangdachengzi oil-bearing formation.Ratio of Ni/Cu and Mn/Fe is obviously different in various areas.The content of metal elememts in stratigraphic water is concerned with the hy drocarbon-bearing property of reservoir on the plane.The content of metal elements is gradually decreased from oil and gas bearing areas to water bearing areas.
A MODELLING EXPERIMENT AND MECHANISM ANALYSIS OF OIL ACCUMULATION IN POD-LIKE SANDBODY
Chen Zhangming, Zhang Yunfeng, Han Youxin, Fu Guang
1998, 20(2): 166-170. doi: 10.11781/sysydz199802166
Abstract(610) PDF-CN(328)
Abstract:
In this paper,the oil-accumulation process of pod-like water sandbody is studied by physical moelling experiments.It is considered that the comprehensive action of capillary pressure and hydrocarbon-expul sive pressure under a hydrostatic condition results in oil-water-alternating oil accumulation in sandbody.Among all experiments,the pod-like sandbody surround by nsource rocks" has the fastest oil-accumulationcourse,and that outside"source rocksn and linked up by fractures has slower one.Also,the oil accumula tion in pod-like sandbody under nsource rocks" is slower than that upper nsource rocksn.
A STUDY OF INFLUENCE OF CENTRIFUGE-SEPERATED LIQUID OF ZnCl2 TO ROCK-EVAL PYROLYSIS
Sun Lizhong, Cai Longyi, Guo Zhenglong, Weng Rongnan
1998, 20(2): 171-173. doi: 10.11781/sysydz199802171
Abstract(600) PDF-CN(229)
Abstract:
The influence of ZnCl2,a centrifuge-separation liquid,to Rock-Eval pyrolysis was studied.Coal sam ple were collected from Yu-Feng mine in San-Hsia area,northern Taiwan.The sample was crushed and then divided into three parts namely P1,P2 and P3 respectively.P1 is the original coal sample;P2 had been immersed in ZnCl2 liquid and then dried up in room temperature;P3 is similar to P2,but had been water washed be fore drying up.Preliminary results show that both S1 and S2 were evenly distributed in coal par ticles.Significant differences in S1,S2,Tmax,TOC and HI was observed for P2 sample,but not Ip(production index)value.After cleansing ZnCl2 by water-washed,P3 showed that the previous pyrolysis pa rameters,except Ip still dropping,can be resumed to those of P1.
THE PERMIAN SOURCE ROCK ANALYSIS IN THE SANTANGHU BASIN OF XINJIANG
Zhang Zhihuan, Guan Qiang
1998, 20(2): 174-181. doi: 10.11781/sysydz199802174
Abstract(635) PDF-CN(317)
Abstract:
There are mainly three sets of source rocks distributed in the Santanghu Basin:the Middle and Lower Jurassic Shuixugou Group,the Middle and Upper Triassic Xiaoquangou Group and the Permian Shangjijicao Group.At present,oil/gas flow or oil/gas showing is discovered in the grit rock of the Middle Jurassic Xishanyao Formation and the volcanic rock of the Lower Permian Kalagang Formation.In this paper,the main source rocks of the Santanghu Basin and the geochemical characteristics of Permian crude oil are introduced.Based on the total composition of crude oil and source rocks and the compositional characteristics of molecular geochemistry,the oil-source rock correlation is conducted and the main source rocks of Permi an crude oil is analysed.
GEOCHEMICAL CHARACTERISTICS OF THE JURASSIC HYDROCARBON SOURCE ROCKS IN THE BAIGEZHUANG UPLIFT
Li Sumei, Wang Tieguan, Zheng Hongju, E Junjie
1998, 20(2): 182-186. doi: 10.11781/sysydz199802182
Abstract(593) PDF-CN(187)
Abstract:
The hydrocarbons in the chloroform extract of Jurassic source rocks(mudstone,coal)in the Baigezhuang Uplift of East Hebei province have been analysed systematically by means of organic geochem ical measurements.It is revealed that the source rocks have the geochemical characteristics of coal-measure strata and belong to mature hydrocarbon source rocks.An unusual compound series-alkyl benzene dis covered in the fraction of saturated hydrocarbons is probably from microbial and algal origin.
DISCUSSION ON CERTAIN PROBLEMS TO THE DIVISION OF ORGANIC MATTER TYPES IN KEROGEN
Tu Jianqi, Wang Shuzhi, Fei Xu
1998, 20(2): 187-191. doi: 10.11781/sysydz199802187
Abstract(808) PDF-CN(428)
Abstract:
In this paphr,a large number of samples at home and abroad are analysed under microscope by means of the Transmitted Light-Fluorescence Analysis.Combined with the analyses of organic geochemistry and organic matter origin,certain problems existing in the division of organic matter types in kerogen at present are discussed,and some new knowkedge is suggested.
STUDY AND APPLICATION OF METHOD FOR DETERMINING THE RATIONAL PRODUCTIVITY OF GAS-CONDENSATE WELL
Kang Zhijiang, Qiu Liwei, Li Tong, Chen Yuanqion
1998, 20(2): 192-195. doi: 10.11781/sysydz199802192
Abstract(549) PDF-CN(314)
Abstract:
This paper systematically introduced how to determine rational productivity of a'gas-condensate well and present the procedure of formula deducing for determining the productivity,which was based on the absolute open flow(AOF)of gas-condensate well.Those methods have been applied to a gas-conden-sate reservior of the north Tarim basin.The results indicated that the procedure is perfect and practical.
RELATIONSHIP BETWEEN THE GENERATING AMOUNT AND GATHERING SCALE OF OIL AND GAS AND THE BACKGROUND FIELD OF REGIONAL GEOCHEMISTRY
Jia Guoxiang
1998, 20(2): 196-199. doi: 10.11781/sysydz199802196
Abstract(633) PDF-CN(251)
Abstract:
Based on the changing characteristics of regional geochemical background values in basins,the mean content of background values in different depositional basins is disscussed as a focal point in this paper in order to evaluate the generating amount of oil and gas in basins and to predict the sca1e of oil/gas distribution and the favoriable zones of oil/gas accumulation in basins.
KEY PROBLEMS OF OIL/GAS GEOCHEMICAL EXPLORATION AND SOME SUGGESTIONS TO THE DEVELOPMENT OF ITS APPLICATION
Liu Chongxi, Cheng Jun, Zhao Kebin
1998, 20(2): 200-203. doi: 10.11781/sysydz199802200
Abstract(594) PDF-CN(294)
Abstract:
With the quick development of oil/gas geochemical exploration(G.E.),not good application effects,the neglect of quality,badly representative samples,the obscure stages of oil/gas geochemical explo ration,the absolute application of indexes,the ignoring of regional geochemical study and other problems have occurred.In this paper,the authors make some suggestions to the correct treatment and application of G.E.technology,the serious execution of G.E.standard,the enforcement of laboratory measure au thentication and comprehensive study,etc.

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