石油实验地质

Contents Vol.31,No.2 Apr., 2009

2009, 31(2)

Abstract(972) PDF-CN(877)

Abstract:

TECTONIC CYCLES AND PETROLEUM EXPLORATION POTENTIAL IN THE EAST QINLING AND DABIE OROGENIC BELT

He Zhiliang, Cheng Zhe, Xu Xuhui, He Mingxi, Guo Zhanfeng

2009, 31(2): 109-118. doi: 10.11781/sysydz200902109

Abstract(1355) PDF-CN(1148)

Abstract:
The basin groups in both sides of the East Qinling and Dabie Orogenic Belt have experienced 5 different tectonic cycles since the Mesoproterozoic.After Zhongtiao(Luliang)Movement,the Jiliao,Yushaan and Xuhuai Aulacogens were formed in North China.With brokenness of the Rodinia ancient continent after the Jinning Movement,the Qinling-Dabie ocean,which was a part of the Tethyan ocean for a time,was gradually developed and the margin of the Yangtze Craton and North China Craton had gone through the evolution from continental rift to passive continental margin.The alternative pattern of subduction-collision mountain system and convergent basins was developed due to transferring of extend system to convergent system after the middle Caledonian movement(the Middle Ordovician).In the late Caledonian or early Hercynian,the early detached continental blocks were combined together again.And the alternative graben-horst pattern was presented in the Devonian.Some small scales of rift groups were developed in the southern side of the orogenic belt in the Late Permian and it was changed to convergent system after the Middle and Late Triassic Indosinian Movement.They went through the collection,collision and compression process,which was maximized in the Yanshanian period of the end of the Jurassic.Since the Cretaceous,basin groups with domination of intracontinental extension-strike slip-weak compression were developed and then the basins were destroyed by extension or strip slip again.The multiple combination of basin prototypes was formed by 5 basinal tectonic cycles,which formed basic conditions for hydrocarbon accumulation.There were 8 sets of combination of source,re-servoir and seal in vertical section.The effective hydrocarbon kitchen and preservation,which was controlled by tectonic evolution and thermal system,was the critical factors for hydrocarbon accumulation.There are favorable potential for petroleum exploration of basins in both sides of the orogenic belt.Besides the Cenozoic Nanxiang and Jianghan oil producing basins,the potential regions include the Late Paleozoic to Early Mesozoic Louyu residual basin,the Taikang residual basin,the Zhoukou superimposed composite basin and Xinyang composite basin in the northern side,the deep seated Paleozoic in the Nanxiang basin of internal orogenic belt,and the pre-Tertiary Jianghan composite basin,the Paleozoic Yichang-Dangyang reformed residual basin,the shadow basins under the southeastern Hubei thrust belt and the Dahongshan thrust belt respectively,in the southern side of the orogenic belt.

DIKTYOGENESE AND BASINS IN CHINA CONTINENT DURING THE MESOZOIC-CENOZOIC

Xu Xuhui, Huang Zeguang, Gao Changlin, Zhang Yuchang

2009, 31(2): 119-127. doi: 10.11781/sysydz200902119

Abstract(1316) PDF-CN(921)

Abstract:
The Chinese continent was compressed from three directions after the Indosinian orogeny,with 3 periods of diktyogenese movements.The first diktyogenese period could be divided 2 stages.Due to the closing of the Palaeo-Tethys,the foredeeps which were related to squeeezing were developed in the stage 1(T₃—J₂)in West China.As a result of the closing of the Nujiang Ocean,the squeezing foredeeps were continuously developed in the stage 2(J₃—K₁).The fault basins were developed in NE China and the former foredeeps were reformed or small pull apart basins were arranged in rows in South China,owing to Izanagi Plate subduction and collision.

TECTONIC AND PALEOGEOGRAPHIC EVOLUTION OF LATE CALEDONIAN IN THE SOUTH OF CHINA CONTINENT

Zhou Xiaojin, Yang Fan

2009, 31(2): 128-135. doi: 10.11781/sysydz200902128

Abstract(1627) PDF-CN(1051)

Abstract:
Through the analysis of tectonic-paleogeographic distribution and evolutional characteristics during five periods of Late Caledonian in the south of China,a few conclusions are got as follows: Collision of Huaxia and Yangtze landmasses started from Late Ordovician and gradually developed from southeast to westnorth,where greatly thick sandstone and shale sediment of foreland basin develop in Hunan-Jiangxi Provinces.Jiangnan-Xuefeng belt and Central Guizhou zone belong to uplift behind foreland basin and control the sedimentary evolution of basins in Yangtze craton.Affected by the landmasses collision,the paleogeography in the southeast edge of Yangtze craton transforms from deep-sea to littoral or shallow sea basin,while the paleogeography inside Yangtze craton transforms from carbo-nate platform in shallow sea environment to depression with lag deposit in deep water environment.The depression inside Yangtze craton gradually moves to the front of foreland uplift,where coarse clastic rocks sediment of littoral and delta facies mainly forms.But tectonic-paleogeographic evolutional framework in the west of Sichuan-Yunnan is entirely different from the south of China,it presents the background of regional extension and marine transgression in Silurian.

SOUTH QINLING IN THE DEVONIAN：JUXTAPOSITION OF PERIPHERAL FORELAND BASINS AND NEW-BORN OCEANIC BASINS

Gao Changlin, Huang Zeguang, Fang Chengming

2009, 31(2): 136-141. doi: 10.11781/sysydz200902136

Abstract(1974) PDF-CN(1003)

Abstract:
The formative tectonic environment of the South Qinling in the Devonian has been a focal item in a long time.By study of tectonic background,comprehensive comparison of the sedimentary and geochemical characteristics,the prototype basins were recognized in the South Qinling.The Devonian prototype basins included the peripheral foreland basins in East Qinling,the peripheral foreland basins(northern part)and new-born oceanic basins(southern part)in West Qinling and,at the same time,a new-born aulacogen was developed in between the East Qinling and the Yangtze plate(Gaochuan),which was divided by the Foping uplift.All the above basins were juxtaposed in space.

LATE PALEOZOIC TECTONICS ENVIRONMENT AND HYDROCARBON SIGNIFICANCE OF EAST QINLING-DABIE OROGENIC BELT AND ITS BOTH SIDES

Huang Zeguang, Fang Chengming, Yang Xiao, Gao Changlin

2009, 31(2): 142-147. doi: 10.11781/sysydz200902142

Abstract(1452) PDF-CN(1022)

Abstract:
On the basis of geochemical analysis for volcanic rocks from East Qinling-Dabie Orogenic Belt and its both sides: Zhuangke of Lüyang County and mid-Atlantic ridge can be classified as the same type of rocks characterized by low ratio of K₂O/SiO₂,high ratio of TiO₂/SiO₂,low value of ΣREE,with flat REE pattern and not enriched LREE,which are between the continental and the oceanic tholeiite.The rock characteristics from Sanchazi of Lüeyang County,Lianghe of Shiquan County and the Japanese island arc are high ratio of K₂O/SiO₂,low ratio of TiO₂/SiO₂,high value of ΣREE and richment of LREE,the REE distribution pattern showed steep right-dip.This paper considers that the environment of West Qinling Mountain(Mianlüe-Animaqing-Soto Lake-Mazha)is the Paleo-Tethys Ocean in the Late Paleozoic,the east area(passed by the Zhenba-Chengkou-Qingfeng-Xiangfan-Zhoujiawan-Guangji)is aulacogen sediments.The south side of Qinling-Dabie Orogenic Belt is mainly in the extended environment affected by Paleo-Tethys Ocean which main hydrocarbon source rocks are Permian carbonate,shale and coal,and enriched gas.While the north side is in a state of intracontinental depression accompanying the uplifting,and the Carboniferous-Permian coal-bearing strata are the main hydrocarbon source rocks,secondary hydrocarbon generation in Late Yanshanian-Himalayan has important significance for oil and gas accumulation.

FORMATION AND EVOLUTION OF THE LUONAN-LUANCHUAN FAULT BELT IN THE EAST QINLING REGION

Lu Yongde

2009, 31(2): 148-153. doi: 10.11781/sysydz200902148

Abstract(1560) PDF-CN(1258)

Abstract:
On basis of investigation of the structural characteristic,study of geophysical behavior and analysis of evolution history of the Luonan—Luanchuan fault belt,it was considered that the fault was long lasting lithosphere fault between the North China Plate and the northern Qinling orogenic belt.It controled development of the Luonan—Luanchuan and Yunjiashan-Erlangping fault basins during the Proterozoic to the Early Ordovician.The fault was thrusted from south to north during the Silurian to the Devonian,and it was not active in the Late Paleozoic.The front zone of the orogenic belt was conti-nuously advanced toward to the north during the Middle Triassic to the Early Cretaceous.The pull apart basins were developed along the Luonan-Luanchuan fault belt under background of right slip movement in the northern Qinling area during the Late Cretaceous.

THE STUDY OF EXPLORATION PROSPECT OF MARINE NATURAL GAS IN THE NEOPROTEROZOIC-LOWER PALEOZOIC ON THE SOUTH MARGIN OF THE NORTH CHINA PLATFORM

He Mingxi, Du Jianbo, Wang Rongxin, Guo Shangting, Yan Yongxin, Wu Minghui, Xie Qifeng, Li Fengxun

2009, 31(2): 154-159. doi: 10.11781/sysydz200902154

Abstract(1609) PDF-CN(962)

Abstract:
According to the field investigation results on the northern edge of the Qingling-Dabie Orogenic Belt,it was showed that the black mudstone and shale containing phosphor in the Lower Cambrian Yutaishan/Dongpo formation on the south margin of the North China Platform was the high quality source rocks,and the dark grey shale in Cuizhuang/Liulaobei formation of the Qingbaikou System was the potential source rocks.The Neoproterozoic-Lower Paleozoic sandstones and dolomites were the main reservoirs,with favorable pore space developed on several karst erosional surfaces internal the Neoproterozoic-Lower Paleozoic sequences.And the shale and the carbonate rocks with gypsum in the Neoproterozoic-Lower Paleozoic were the cap rocks.There were basic conditions for hydrocarbon ge-neration and accumulation although the thermal maturity was higher in the area.Therefore,it is probably the new formation and new domain for exploration of the marine natural gas in the Neoproterozoic-Lower Paleozoic on the south margin of the North China Platform.

CHARACTERISTICS OF BASIN EVOLUTION AND HYDROCARBON RESPONSE IN MIDDLE YANGTZE REGION SINCE NANHUA PERIOD

Liu Xinmin, Fu Yixing, Gou Zhanfeng, Wang Youlai, Liang Xiwen

2009, 31(2): 160-165. doi: 10.11781/sysydz200902160

Abstract(1524) PDF-CN(979)

Abstract:
This artical analysed the basin evolution since Nanhua period in the Middle Yangtze region,and pointed out it undergo Caledonian,Hercynian-Early Yanshanian and Late Yanshanian-Himalayan three basin-mountain evolution cycle,rearched the response characteristics of hydrocarbon to basin evolution.The development characteristics and controlling factors of sourse rocks and reservoir rocks,and the control of paleouplift to hydrocarbon were analysed.Before Early Indosinian period,hydrocarbon migration were controlled by paleouplift.Parallel migration were main manner,and hydrocarbon were accumulated.In Late Indosinian-Early Himalayan period,the hydrocarbon were mainly destroied and regulated.The short range vertical migration were main manner.Hydrocarbon accumlation were finalizd in Late Himalayan period.

POTENTIALITY AND STRATEGIC SELECTION PLAYS OF PETROLEUM EXPLORATION IN MARINE STRATA NEARBY SOUTHERN MARGIN OF EAST QINLING-DABIE OROGENIC BELT

Yang Zhenwu, Guo Zhanfeng, Liu Xinmin

2009, 31(2): 166-171. doi: 10.11781/sysydz200902166

Abstract(1387) PDF-CN(862)

Abstract:
The complex tectonic system of East Qinling-Dabie orogenic belt and its southern basin has been formed in uniform earth dynamic background.The margin of East Qinling-Dabie orogenic belts has developed typical passive continental edge from Sinian to Silurian,and early rift basins,passive continental edge,and forland basin from Neopaloezoic to early Mesozoic,finally block-faulted orogenic during Neomesozoic and Cenozoic.Different kinds of prototype basins have been supplied with kinds of realms to explore,through developing formations of transverse juxtaposition and longitudinal overlap for the foundation of reserve substance.The forland fault-thrusted belts are thought of large exploration potentiality for the petroleum reserve and weak tectonic transformation.The direction to strategic selection plays of petroleum exploration should focus on 3 different realms to realize for breakthrough:marine "lowdown type","shadow basin type",and "unconvention type " in the region.

CHARACTERISTICS OF MIDDLE-UPPER CAMBRIAN DOLOMITE RESERVOIR IN THE XINGSHAN AREA OF THE SOUTHERN MARGIN OF QINLING AND DABIE OROGENIC BELT

Sheng Xiancai, Guo Zhanfeng, Liu Xinmin

2009, 31(2): 172-176. doi: 10.11781/sysydz200902172

Abstract(1457) PDF-CN(1237)

Abstract:
The Middle-Upper Cambrian dolomite reservoirs are well-developed in Xingshan area of the southern margin of Qinling and Dabie orogenic belt.Based on geologic survey on field outcrop profiles,as well as tests on conventional thin sections,SEM,image,petrophysical property,etc.,it has been found out that effective Middle-Upper Cambrian dolomite reservoirs are composed of micritic-crystalline powder dolostones,granular dolostones and kryptomere-mesocrystalline dolostones and so on.Effective reservoir spaces in micritic-crystalline powder dolostones are dominated by intercrystalline pores.Granular dolomites include oolitic dolostones,dolarenites and dolorudites with effective reservoir spaces consisting of intergranular pores and intragranular corrosion pores.Moreover,non-selective corrosion pores and intercrystalline pores develop in kryptomere-mesocrystalline dolomites.Formation and evolution of above-mentioned reservoirs are mainly controlled by effects of sedimentation and diagenesis.Sedimentation is the basis and determines spatial distribution characteristics of reservoir.Flat sedimentary landform and frequent changes of relative sea-level lead to the formation of lithologic interbed.Dolomitization and selective dissolution after burial make granular dolostones and kryptomere-mesocrystalline dolostones with good porosity and permeability come into being.They work as good re-servoirs in the Middle-Upper Cambrian.

THE STUDY OF PETROLEUM-BEARING PROSPECT OF MARINE PALEOZOIC OF THE XIANG-ZAO DEPRESSION IN THE NANXIANG BASIN

Yang Daoqing, He Mingxi, Wang Rongxin, Guo Shangting, Du Jianbo, Luo Jiaqun, Cheng Zhe, Ji Yunyao

2009, 31(2): 177-180. doi: 10.11781/sysydz200902177

Abstract(1410) PDF-CN(853)

Abstract:
The Xiang-Zao Depression of the Nanxiang Basin is a half graben-like sag in Mesozoic-Cenozoic with faulted in the south part and overlapped in the north,which is mainly controlled by the Xiangfan-Guangji fault,and has not been a breakthrough through many years of exploration in the Mesozoic-Cenozoic.Through the "petroleum sources of strategic electoral districts on the northern edge of the Qinling-Dabie Orogenic Belt" subject research,found that nonmetamorphose rock of Paleozoic marine strata was distributed in the periphery of Xiang-Zao Depression and its deep part.Among which,mudstone-shale containing phosphor is a potential high-quality source rocks at the bottom part of the Lower Cambrian;Dolomite and internal erosion surface formation are better reservoir strata in the Lower Paleozoic;Lower Paleozoic Dolomite containing paste is potential covered layer,which forms the basic geological conditions of oil-gas.But the source rocks are having high degree of thermal evolution.Paleozoic oil-gas of deep marine strata in the Xiang-Zao Depression is the new layer system and a new field,which is worth in-depth exploration.

PETROLEUM GEOLOGICAL SIGNIFICANCE AND CHARACTERISTICS OF CALEDONIAN PALEOUPLIFT IN THE SOUTHERN MARGIN OF EAST QINLING AND DABIE OROGENIC BELT

Guo Zhanfeng, Liu Xinmin, Sheng Xiancai, Ma Dengfeng

2009, 31(2): 181-185. doi: 10.11781/sysydz200902181

Abstract(1638) PDF-CN(802)

Abstract:
There is a inherited paleouplift in the Jianghan Plain area of the southern margin of East Qinling and Dabie Orogenic Belt during Caledonian period.The authors believe that the Ezhong(Central Hubei Province)paleocontinent named by predecessors is its concrete expression.It exists in Late Sinian-Middle Cambrian in time domain and mainly distributed in Shennongjia-Baokang-Jingmen-Jingshan of the northern Jianghan Plain area and its north on the plane.The Ezhong paleocontinent passes over the Qingfeng-Xiangfan-Guangji fault zone.Subsequently,successive development of paleouplift has controlled paleogeomorphic forms of higher in the north and lower in the south during Caledonian period in the middle Yangtze region.The results showed that the Caledonian paleo-tectonic could be divided into four different structural units(the graben-horst belt of the East Qinling;the northern uplift belt of the middle Yangtze;the middle slope belt of the middle Yangtze;the southern depression belt of the middle Yangtze).The Caledonian paleouplift was evident in control of Sinian-Lower Paleozoic reservoir conditions in the southern margin of East Qinling and Dabie Orogenic Belt.The Caledonian paleouplift was a favorable destination for the migration and accumulation of early liquid hydrocarbon,which is important target for petroleum exploration breakthrough of Sinian-Lower Paleozoic reservoirs in Jianghan Plain.

STUDY OF STRUCTURAL CHARACTERISTICS OF XIANGFAN-GUANGJI FAULT IN HUBEI PROVINCE

Chen Lin

2009, 31(2): 186-191. doi: 10.11781/sysydz200902186

Abstract(1684) PDF-CN(968)

Abstract:
As one of boundary faults in the southern margin of Qinling-Dabie Orogenic Belt,Xiangfan-Guangji Fault is the most crucial one,which has long been debated on its property.For purpose of solving this issue,further study is made on geological structure characteristics of the southern margin of East Qinling and Dabie,and in the paper,combined with results of regional survey in recent years,the Cretaceous basin in Qingfeng and Sanligang are selected as cases to determine the property of Xiangfan-Guangji Fault again,by adopting plate tectonic theory and modern research method of orogenic belt.The results show as follows: the Xiangfan-Guangji Fault,formed in Himalayan stage,is an extra-large scale brittle fault with the feature of thrusting from south to north.In earth's surface,it not only is the line to divide Yangtze platform and Qinling approximately,but also covers the boundary between orogenic belt of Yanshannian Movement and stable platform.Moreover,its control on sedimentation since Proterozoic is found to be insignificant.In Qingfeng and areas west,its deformation appears to multi-phase structural feature,which in fact is product under different tectonic systems,causing by superposition of Xiangfan-Guangji Fault with tectonics of Yanshannian orogenic period.

ANALYSIS OF THE SEEPAGE OIL AND OIL SOURCE IN CHENGKOU AREA OF THE SOUTHERN MARGIN OF DABASHAN

Zhai Changbo, Gao Jianjun, Huang Haiping, Lü Junxiang, Wang Dongyan

2009, 31(2): 192-196. doi: 10.11781/sysydz200902192

Abstract(1508) PDF-CN(895)

Abstract:
The oil seepages were occurred along a series of thrust faults in the front of Dabashan.Based on comparative analysis of the source rocks in the southern margin of Qinling mountain and its surroundings and the seepage oil in Chengkou area,it showes that carbon isotope of the seepage oil is close to that of the extract of the Lower Paleozoic source rocks,but different with that of the extract of the Permian source rocks.The results show intimate relationship between the seepage oil and the Lower Paleozoic source rocks.However,the biomarker parameters by GS-MS indicate that the seepage oil is more similar to the Permian source rocks.According to analysis of tectono-depositional history and hydrocarbon generation history of the source rocks,the seepage oil came from the Permian source rocks.During hydrocarbon migration and entrapment,some organic geochemical information of the Lower Paleozoic source rocks was mixed.

THE OIL AND GAS GEOLOGICAL CONDITION OF MARINE STRATA IN THE ZIGUI-WUFENG, THE WESTERN XUEFENG MOUNTAINS AREA

Li Xubing, Wang Chuanshang, Liu An

2009, 31(2): 197-201. doi: 10.11781/sysydz200902197

Abstract(1465) PDF-CN(854)

Abstract:
There are four sets of high-quality hydrocarbon source rocks in the Zigui-Wufeng,the western Xuefeng Mountain area,including Doushantuo Formation of Lower Sinian,Shuijingtuo Formation of Lower Cambrian,Wufeng Formation of Upper Ordovician-Longmaxi Formation of Lower Silurian,and Qixia and Maokou formations of Lower Permian.The Content of organic carbon usually being 0.21%～9.77%.But organic carbon of Shuijingtuo Formation of Lower Cambrian is more than 1.99%,the max is 9.77%,which is the best hydrocarbon source rocks.Porosity and permeability of the reservoir rocks,the Hamajing Member of Dengying Formation of Sinian,are relatively higher,average is 8.23%,and 3.66×10^-3μm².Hence the Hamajing Member is the best reservoir in the studied area.Based on the development of the source-reservoir-cap rocks in the Sinian-Middle Triassic marine strata,three assemblages can be divided,of which the lower two assemblages belong to the Lower Marine Assemblage,the other belongs to the Upper Marine Assemblage.The assemblage of Sinian-Shipai Formation of Lower Cambrian is well preserved,and can be divided into two secondary assemblages,i.e.,the combination of lower source rocks with upper reservoir rocks and the combination of lower reservoir rocks with upper source rocks.It is concluded that the dolomite reservoir of Sinian Dengying Formation in assemblageⅠis of certain oil and gas exploration prospects.

HYDROCARBON PRESERVATION CONDITIONS IN WEST HUBEI AND EAST CHONGQING

Deng Mo, Lü Junxiang, Pan Wenlei, Zhai Changbo, Wen Tao, Zhu Yiqing, Yang Xiao

2009, 31(2): 202-206. doi: 10.11781/sysydz200902202

Abstract(1405) PDF-CN(957)

Abstract:
Analyses of distribution and preservation characters of sealing rocks,sealing ability of main faults and chemical environment of formation water in wells have indicated that,there are differences of hydrocarbon preservation conditions among different regions in West Hubei and East Chongqing.Due to occurrence of complete sealing sequence,especially wide distribution of gypsum seal of the Lower Tria-ssic Jialingjiang Formation and poor development of fault structures,the Shizhu synclinorium is most favorable for hydrocarbon preservation.The Fangdoushan and Qiyueshan buried structures are both favorable for preservation,with the former better than the latter.Main part of synclinorium shows poor preservation conditions as the result of regional large fault opening and regional seal erosion.In the south of Lichuan synclinorium,seals are relatively complete and preservation conditions are good;while in the north,it is poor.

2009 Vol. 31, No. 2

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