Oil & Gas Geology-1992, Volume 13 Issue 1

PROTOTYPE BASIN AND SEDIMENTARY MODEL OF PERMO-CARBONIFEROUS IN TARIM PLATE

He Zhiliang, Gou Huawei, Li Xiaorong, Yan Xiugang

1992, 13(1): 1-14. doi:10.11743/ogg19920101

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Permo-Carboniferous was the main period ih the late evolution of craton basin for Tarim Plate.its prototype basin was formed in the setting of plate convergence.The uplift and development of the plate was controlled by the continent-continent subduction along Hantengri-Kumux fault in the north side of the plate,leading to the foreland flexural-break subsidence on the north margin;by the oceanic-continent subduction along Kangxi-war fault in the south side,leading to the foreland flexural subsidence of back-arc in Southwest Tarim;by thermal decay and isostatic subsidence of the shriveling stage in Awati-Mangjiar region,Northeast Tarim;and by the mosaic and compression of Beishan-Altun landmass along Qiemo-Xingxingxia fault.During Permo-Carboniferous,tectonic evolution associated with sea level variation(from transgression to regression)and the cli-mate changes (from dry to wet,and then dry again) controlled the sedimentary environ-ment and assemblage pattern of the Tarim Plate.

REGIONAL TECTONIC EVOLUTION AND HYDROCARBON POTENTIAL OF NORTHEAST TARIM BASIN

Li Ming

1992, 13(1): 15-27. doi:10.11743/ogg19920102

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Tarim Basin experienced three development stages such as Presinian geosyncline,Paleozoic platform and Meso-Cenozoic continental basin stages.In Presinian stage,the paleogeosyncline shrinked and the continental nucleus expanded continuously,thus form-ing immense Tianshan-Tarim Platform in the end of the Proterozoic.The platform was disintegrated until Early-Middle Caledonian,forming a huge oil-generation depression—Amang Depression in the north of the platform.During late Caledonian to early Hercyni-an,uplifts and depressions developed in the region,forming the North Tarim Uplift.Mid-dle Hercynian was the main stage for hydrocarbon generation and accumulation,the North Tarim Uplift continued to expand and East Tarim Uplift formed.Early Permian tectonic movement ended the development of sea basin,and stopped oil generation of Pa-leozoic source rocks.During Meso-Cenozoic,oil-generation depressions formed in north and south sides of Xinhe Uplift which became a large Mesozoic oil accumulation zone of drape structural type in Indo-Sinian and Yenshanian stages.Since Indian and Asian Plates compressed and collided each other,Tianshan and Kunlun Mountains folded systems up-lifted intensely,and the sediments in the associated piedmont depression unceasingly over-lapped towards Tarim Basin,thus forming favourable caprocks for Meso-Cenozoic hydro-carbon resources in the basin,leading to the oil generation of Paleozoic source rocks.The Folded-faults formed in the end of Himalayan stage prepared necessary conditions for hy-drocarbon migration and accumulation again.

DIAGENESIS AND POROSITY EVOLUTION OF CARBONATES FROM UPPER CARBONIFEROUS IN CENTRAL HUBEI

Ai Huaguo

1992, 13(1): 28-36. doi:10.11743/ogg19920103

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Based on the study of petrology,using the data of cathodoluminescents,stable iso-topes of oxygen and carbon,trace elements and composite colouring,the diagenesis,diage-netic sequences and pore evolution of Upper Carboniferous carbonates in Central Hubei were studied in detail.The study shows that filling,cementation,solution,dolomitization,compaction and pressure-solution were the principal factors in controlling the reservoir properties of the Upper Carboniferous in Central Hubei,the most important of which were the dolomitization,solution in deep burial environment and pressure-solution in forming the pores of accumulation stage.

ANALYZING MESO-CENOZOIC TECTONIC-SEDIMENTARY CYCLES IN EAST CHINA ACCORDING TO TECTOSTRATIGRAPHY

Lin Zongman

1992, 13(1): 37-46. doi:10.11743/ogg19920104

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According to the basic comception of tectostratigraphy,the author divided the Meso-Cenozoic Systems in East China into six tectonic-sedimentary cycles and proposed that the Lower Eogene should belong to Upper Cretaceous,Upper Triassic to Lower Jurassic in South China and the Nanyang Basin to Cretaceous.An important tectonic generation in the end of Jurassic is significant in dividing the tectonic evolution history into two stages,that is,Triassic-Jurassic stage and Late Cretaceous-Tertiary stage.Two huge tectonic sys-tems that developed in the stages derived from the same origin but different from each other.Extensive tectonic uncomformities could be found between the tectonic systems,thus resulting in two dimensional feature of Meso-Cenozoic Systems in East China.

PLATE TECTONICS AND BASIN TYPES IN NORTHWESTERN CHINA

Yang Keming, Xiong Yongxu, Li Jinguang, Xian Rongyou

1992, 13(1): 47-56. doi:10.11743/ogg19920105

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Northwest China had experienced three major development stages,i.e.plate diver-gence from Middle Proterozoic to Early Paleozoic;plate convergence from Late Paleozoic to the end of Triassic;basin-mountain mechanism from Jurassic to Quaternary.The transformation between the tectonic mechanisms of oceanic and continental lithospheres,together with the influence exerted by the Tethys Plate since Meso-Cenozoicresu lted in three type basins(tensional,compresional and strike-slip.basins)and eleven subtype basins.Multicycle is the basic characteristic of the superimposed basins in this area.The basins extended first and then compressed,thus forming double-layer structure in verti-cle.The extention provided ideal place for the deposition of source rocks and the compres-sion prepared necessary condition for hydrocarbon migration ahd accumulation.

CONDENSATE OIL AND GAS AND THE MIGRATION MODEL IN TARIM BASIN

Liu Jincai, Chen Zhigao

1992, 13(1): 57-70. doi:10.11743/ogg19920106

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According to the conditions and principles of object occurrence and in association with the data of geology,geophysical exploration,geochemistry and testing,it is pro-posed that hydrocarbons in the Tarim Basin are preserved in condensate oil and gas fields(pools)mainly as condensate gas or condensate gas with light oil-rim or bottom oil.Un-der specific geological conditions of low geothermal temperature and great burial depth in threshold and peak of oil-gas generation,the primary migration was finished through mi-crofractures,and the secondary migration took the form of gas dissolved oil and free state oil.

CLASSIFICATION OF CRETACEOUS AND ITS BOUNDARY WITH JURASSIC IN NORTHWEST CHINA

Zhang Shouan, Yi Ronglong, Li Ming

1992, 13(1): 71-77. doi:10.11743/ogg19920107

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According to the stratigraphic paleontological characteristics,the Tugulu,Kizilsu,Ka-pushaliang,Miaogou,Hekou,Xingmingbao,Donghe Groups and Chijingqiao,Wuerta,Dashuigou Formations,the lower part of the Quanyagou Group and their correspounding stratums are classified to Lower Cretaceous;the Ailikehu,Donggou,Bashijiqik,Kumutag,Subashi,Wulanshaohu,Minghe Formations and the Jinggangquan,Maliangou,the upper Quanyagou Groups and their equivelent stratums are classified to the Upper Creta-ceous.The boundary between the Jurassic and the Cretaceous is suggested to be set be-tween Kalazha Formation and Tugulu Group,Hongshan Formation and Tugulu Group,Shazaohe Group and Miaogou Group,Kushuixia Formation and Hekou Group,Hong-shuigou Group and Quanyagou Group,Wanxiu Group and Donghe Group.

OCCURRENCE CONDITION AND POTENTIAL ESTIMATION OF GAS IN MAJOR BASINS,NORTHWEST CHINA

Li Xuehui, Huang Fuling, Liu Houren

1992, 13(1): 78-84. doi:10.11743/ogg19920108

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The divergence,convergence and collision of the three main plates(Tarim,Junggar-Altun and Alxa-Qaidam)controlled the formation and development of the basins in Northwest China.The superimposed-composite prototype basins constituted different types of gas(oil)-bearing(Tarim),oil(gas)-bearing(Junggar,Qaidam,Yining,Turpan-Harmi)and oil-bearing(west Jiuquan,Santanghu,Minhe and Badain Jaran-Tengri)basins.Among these basins,the most potential gas-bearing basin is the Tarim,then the Junggar and the Qaidam Basins,the Yining and the Turpan-Hami Basins less favourable.

MESOZOIC SEDIMENTARY ENTITIES,SUPERIMPOSED BASINS IN NORTH CHINA AND THEIR OIL-GAS OCCURRENCES

Jiang Shengbang, Yi Zhihua, Liang Lichao

1992, 13(1): 85-96. doi:10.11743/ogg19920109

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The tectonic evolution and basin development of the Mesozoic in North China are characterized by stages.Accordingly,the Mesozoic Erathem can be divided into six sedi-mentary entities:1.P₂²-T₁ or T₁₊₂;2.T₂₊₃ or T₃;3.J₁₊₂;4.J₃-K₁;5.K₂;6.K₃-E₁.Most of the Meso-Cenozoic basins in North China have vertically multilayer texture;different sedimentary entities are separated by uncomformities,disconformities or para-conformities.This kind of multilayer textures,named as superimposed basins,were result-ed by the superimposition of sedimentary formations formed in different basin-forming stages.The superimposition of the basins could be divided into three types,that is intra-overlapping,lateral overlapping and drape and five styles such as composite,mosaic-like,cross,single-basin and multi-basin drapes.Hydrocarbons usually occur in complecated su-perimposed basins.Through the comparison of hydrocarbon occurrences,it is suggested that the Paleozoic-generated Mesozoic reservoirs will be the main type within three marjor basins in Xinjiang,and Erlian and Jiuxi types will be the main types in Songliao-North China,Hailar-Erlian-Badan Jaran and the Hexi corridor region for hydrocarbon exploration.

SEDIMENTARY FACIES AND MODELS OF HYDROCARBONBEARING SEQUENCES OF THE MAIN BASINS IN NORTHWEST CHINA

Zhu Deyuan, Mu Zehui, Li Xuehui

1992, 13(1): 97-103. doi:10.11743/ogg19920110

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According to the geotectonic background,the prototype of the basins,the combina-tion and sequences of sedimentary facies in Northwest China,eight types of sedimentary models have been set up attempting to find out the origin and distribution regularity of favourable hydrocarbon-bearing zones.

HYDROCARBON GEOCHEMICAL EXPLORATION FROM REMOTE SENSING TEST AREA OF BADAN JARAN BASIN

Tan Qing, Zeng Huasheng

1992, 13(1): 104-113. doi:10.11743/ogg19920111

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Badan Jaran Basin,situated in the west part of Inner Mongolia,is a poorly studied area in petroleum geology as its most areas covered by desert.In 1988,we took an area of 1600 km² near Saihantaolai Town on the west margin of Badan Jaran Desert as remote sensing test area.According to its remote sensing anomoly,a near-surface hydrocarbon geological exploration with the net point of 4 km distance was placed and ground object wave spectrum measurement was also made at the same time.The result shows that the sandy soil samples collected in the region contained methane,ethane,propane,butane and pentane,indicating that there was close relation between the anomalies of geochemical ex-ploration and remote sensing.NW stretching linar structures controlled the Meso-Cenozoic sediments while NE stretching linar structures controlled the hydrocarbon migration and accumulation.The principal geochemical exploration anomaly was situated at the cross section of the above mentiomed linar structures;the circular photographic anomaly of remote sensing fitted to the concentric circular anomalies of ΔC and C₂⁺.

DISCUSSION ON EVOLUTION HISTORY AND HYDROCARBON POTENTIAL OF JUNGGAR BASIN

Luo Chuanchai

1992, 13(1): 114-123. doi:10.11743/ogg19920112

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Junggar Basin is one of the major oil and gas bearing basins in Northwest China.It covers an area of 13?10⁴ km².During its longtime succesive subsidence,the basin received sediments over 10000m thick,especially the thickness in the south margin gets near 20000m.Since Late Devonian,Junggar-Turpan back-arc basin and Northern Junggar arc-basin tectonics formed after the uplift of the West Tianshan-Jiolotag island arc due to the subducting of the Tarim Plate toward the Altan-Junggar Plate.In the late stage of the Early Permian,the Tarim Plate collided and connected with the Altan-Junggar Plate,en-tering the development stage of back-arc remnant basin.The intermont basin stage began in the end of Jurassic resulted by northward subduction of the Indian Plate.Junggar Basin is a large composite basin superimposed by multi-prototype basin which provides favourable and stationary environment for the formation and evolution of the source rocks.The Middle and Upper Carboniferous,Lower Permian are pricipal source rocks,and the Triassic-Jurassic Systems are also important.Various traps developed well in the basin and hydrocarbon potential is fine.

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