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Accumulation characteristics and the main controlling factors of Lunnan multilayer oil province,tarim Basin,china

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Science china Earth Sciences 2008年第S1期51卷 65-76页

作者： YANG HaiJun1 ,2&HAN JianFa 1,2 1Resources School of china University of Geosciences,Wuhan 430074,china 2research institutes of tarim oilfield company,petrochina,korla 841000,china Resources School of china University of Geosciences Wuhan 430074 China research institutes of tarim oilfield company PetroChina Korla 841000 China

Lunnan region is a large-scale paleohigh with many coexisting oil and gas bearing *** present, about 2 billions tons of proved,probable and possible oil and gas reverses have been proved *** oil and gas bearing series have been found in the Ordovician,Carboniferous,Triassic and Jurassic of Lunnan region,they all bear the characteristics of large-scale multilayer oil-gas *** is the main reservoir series where over 0.8 billion tons of oil geologic reserves were discovered,and a super large-scale marine carbonate oil and gas field has *** space of the carbonate reservoirs is mainly composed of dissolved hole,dissolved pore and fracture in Lunnan paleo-burial ***, dissolved holes are widely distributed among *** developments are mainly controlled by karstification and tectonic *** to the similar geochemical characters,the Ordovician,Carboniferous,Triassic and Jurassic oil and gas reservoirs present the same oil source rock of Mid-Upper Ordovician,the latter except Ordovician are mostly of secondary oil and gas reservoirs migrated vertically by faults during the process of multiple phase tectonic movement,adjustment and reconstruction. Lunnan composite oil and gas accumulation region is situated in the vicinity of large-scale hydrocarbon generation depressions in three directions,ample oil and gas from hydrocarbon generation depressions supplied the adjacent oil and gas reservoirs ***,the succeed paleohigh is the long-term hydrocarbon accumulation region,which is favor for the formations of high quality reservoirs,fault systems and huge-scale composite oil and gas accumulation.

关键词： multilayer oil and gas reservoirs paleohigh Ordovician Lunnan region tarim Basin

Abnormal high pressure in Kuqa foreland thrust belt of tarim basin: Origin and impacts on hydrocarbon accumulation

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Progress in Natural Science:Materials International 2006年第12期16卷 1307-1314页

作者： ZENG Lianbo~1** and LIU Benming~ 1,2 (1. Key Laboratory of Hydrocarbon Accumulation in china Petroleum University, Ministry of Education, Beijing 102249, china 2. The Institute of Oil and Gas exploration and development, tarim oilfield company, petrochina company Limited, korla 841000, china) [a]Ministry of Education Key Laboratory of Hydrocarbon Accumulation in China Petroleum University Beijing China [b]The Institute of Oil and Gas exploration and development Tarim Oilfield Company PetroChina Company Limited Korla China

Following analyses of the abnormal high pressure distribution characteristics, based on the geological characteristics, tectonic stress field and physical simulation, we investigated the formation mechanisms of abnormal high pressure and its impacts on hydrocarbon accumulation in the Kuqa foreland thrust belt. The abnormal high pressure appears at the bottom of the Paleogene and obviously exists in the Triassic and Jurassic. However, the pressure coefficient in the Triassic and Jurassic is lower than that in the Cretaceous and at the bottom of the Paleogene. Horizontally, the abnormal high pressure distribution is characterized by E-W orientation zoning. The maximum pressure coefficient lies in the Kelasu-Dongqiu-Dina tectonic zones in the center of the Kuqa foreland thrust belt and decreases away from the tectonic zones. The formation of abnormal high pressure was mainly related with the intense tectonic compression in the Early Pleistocene time, and tectonic uplifting, undercompaction and hydrocarbon generation were secondary factors contributing to abnormal high pressure. Under the rapid and intense tectonic compression in the Early Pleistocene, the rock framework firstly undertook 1/4 of the compression stress and the other was borne by the pore fluids. Due to the presence of great seal of gypsum-salt or gypsum-mudstone beds in the Paleogene, the pressure of pore fluids increased rapidly and led to the abnormal high pressure in the Kuqa foreland thrust belt. The abnormal high pressure has important impacts on hydrocarbon accumulation. It is one of the necessary conditions for formation of large oil and gas fields in the Kuqa foreland thrust belt.

关键词： abnormal high pressure formation mechanism oil and gas reservoir Kuqa foreland thrust belt tarim basin.

Timing and history of marine hydrocarbon accumulation in tarim craton

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Chinese Science Bulletin 2002年第S1期47卷 120-127页

作者： ZHAO Jingzhou~(1,2) & LI Qiming~3 1. Department of Petroleum Geology, Xi’an Petroleum Institute, Xi’an 710065, china 2. research Institute of Petroleum exploration and development, petrochina, Beijing 100083, china 3. tarim oilfield company, Kuerle, Xinjiang 841000, china Xian Petr Inst Dept Petr Geol Xian 710065 Peoples R China petrochina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China tarim oilfield Co Xinjiang 841000 Peoples R China

Based on the analyses of hydrocarbon inclu-sions, K-Ar dating of authigenic illites and oil/gas-watercontact retrospection as well as other methods, the marineprimary reservoirs in the cratonic region of the tarim Basinare found to have been formed in the late Caledonian toearly Hercynian, late Hercynian, and Himalayan, and oil andgas adjusted and redistributed in the Yanshanian (Jurassic toCretaceous) and Himalayan (Tertiary). The analyses alsoshow that the remaining primary oil accumulations aremostly formed in the late Hercynian, and the secondary oilreservoirs resulted from the adjustment and redistribution ofthe earlier accumulations during the Yanshanian and Hima-layan (especially late Himalayan), of which the Himalayan isalso the major stage of gas accumulation. The primary oilreservoirs formed in the late Hercynian mostly occur withinthe Paleozoic formation, whereas the secondary reservoirsformed in the Himalayan in the Mesozoic. The late adjust-ment and redistribution of reservoirs in the craton region ofthe tarim Basin is ubiquitous because of the intensified tec-tonic movements since the Mesozoic, especially Cenozoic andintrusion of the high- to over-mature gas. Furthermore, thelower amplitude of reservoirs in the craton region also makesthem easier to be adjusted and redistributed. Therefore, theremaining paleo-uplift and palaeo-slope developed in rela-tively stable tectonic regions are the main potential areas forthe middle-large marine reservoirs in the tarim Basin.

关键词： tarim Basin craton geochronology of hydrocarbon accumulation history of hydrocarbon accumulation marine reservoir primary reservoir secondary reservoir.

Kinetics of hydrocarbon generation for Well Yingnan 2 gas reservoir,tarim Basin,china

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Science china Earth Sciences 2008年第S1期51卷 107-114页

作者： XIAO ZhongYao 1,2 ,XIAO XianMing 3 ,MA DeMing 4 ,LU YuHong 2 &YANG ChaoShi 2 1 china University of Mining&Technology,Beijing 100083,china 2.research institutes of exploration and development,tarim oilfield company,petrochina,korla 841000,china 3 Guangzhou institutes of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,china 4 Department of Synthetic Physical-Chemical Prospecting,BGP,Zhuozhou 072656,china china Univ Min & Technol Beijing 100083 Peoples R China petrochina Tarim Oilfield Co Res Inst Explorat & Dev Korla 841000 Peoples R China Chinese Acad Sci Guangzhou Inst Geochem Guangzhou 510640 Peoples R China BGP Dept Synthet Phys Chem Prospecting Zhuozhou 072656 Peoples R China

Well Yingnan 2,an important exploratory well in the east of tarim Basin,yields high commercial oil and gas flow in *** gas components and carbon isotopic composition indicate that it belongs to sapropel type *** this region presents many suits of hydrocarbon source rocks,there are some controversies that natural gases were generated from kerogen gas or crude oil cracking gas at *** using the kinetics of hydrocarbon generation and carbon isotope,natural gas of Well Yingnan 2 is composed mainly of crude oil cracking gas,about 72%,it is generated from secondary kerogen gas of Cambrian-Lower Ordovician source rock and crude oil cracking gas of Mid-Upper Ordovician oil *** main oil and gas filling time is 65 Ma later in the Jurassic gas reservoir of Well Yingnan 2,so the gas reservoir belongs to late accumulation and continuous filling type.

关键词： kinetic migration and accumulation process crude oil cracking gas Well Yingnan 2 tarim Basin

Characteristics,genesis and accumulation history of natural gas in Hetianhe gasfield,tarim Basin,china

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Science china Earth Sciences 2008年第S1期51卷 84-95页

作者： WANG ZhaoMing 1 ,WANG QingHua 1 ,ZHAO MengJun 2 ,LI Yong 1 &XU ZhiMing 3 1 tarim oilfield company,petrochina,Kuerle 841000,china 2.research Institute of Petroleum exploration&development,petrochina,Beijing 100083,china 3 Southwest Petroleum Institute,Nanchong 637001,china petrochina Res Inst Petr Explorat & Dev Beijing 100083 Peoples R China petrochina Tarim Oilfield Co Kuerle 841000 Peoples R China SW Petr Inst Nanchong 637001 Peoples R China

Hetianhe gasfield in Bachu region of the tarim Basin is mainly composed of three reservoir-caprock assembly,namely regional caprock of upper mudstone,middle mudstone and lower mudstone of the Carboniferous and reservoir of Bachu bioclastic limestone,glutenite and the Ordovician carbonate buried *** gas in Hetianhe gasfield sourced from the Cambrian source *** is thought that gases in Ma4 well block in the east of Hetianhe gasfield are mainly crude-oil cracked gases,while those in Ma3 and Ma8 well blocks in the west are the mixture gases of kerogen cracked gases and crude-oil cracked *** gas is rich in H2S and accumulated in multiply stages as the result of *** accumulation history is divided into three stages,namely accumulation and breakage in the late Caledonian-early Hercynian,migration and dissipation in the late Hercynian and accumulation in Himalayan. The main accumulation of reformed gas reservoir is in Himalayan.

关键词： gas characteristics gas genesis accumulation history Hetianhe gasfield tarim Basin

Two conceptual models of displacement transfer and examples

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Science china Earth Sciences 2005年第7期48卷 900-911页

作者： GUAN Shuwei1,2, WANG Xin2, YANG Shufeng2, HE Dengfa1 & ZHAO Weidong3 1. research Institute of Petroleum exploration and development, Beijing 100083, china 2. Department of Geosciences, Zhejiang University, Hangzhou 310027, china 3. tarim oilfield company, korla 841000, china research Institute of Petroleum exploration and development Beijing 100083 China Department of Geosciences Zhejiang University Hangzhou 310027 China tarim oilfield company Korla 841000 China

This paper presents two conceptual models of displacement transfer, reverse sym- metry model and infinitely equal division model, based on the fault-bend folding theory. If the fault shape is held constant in the trend, then the distribution of slip magnitude, geometry of imbricate structures and its axial surface map all display reverse symmetry on the process of displacement transfer, as called reverse symmetry model in this paper. However, if the ramp height of thrust fault decreases gradually along its strike, the displacement is postulated to be equally and infinitely divided to every thrust that is formed subsequently, this kinematic process is described using infinitely equal division model. In both models, displacement transfer is characterized by the regular changes of imbricate thrusting in the trend. Geometric analysis indicates that the displacement transfer grads can be estimated using the tangent of deflective angle of hinterland structures. Displacement transfer is often responsible for the distortion and branching of the surface anticlines, especially in the region where the multi-level detachment structures is developed. We also present some examples from the frontal structures of the Southern Tianshan fold-and-thrust belt, Xinjiang, china. Displacement transfer between deep imbricate thrusts in the middle segment of Qiulitag anticline zone causes the Kuqatawu and Southern Qiulitag deep an- ticlines left-lateral echelon. The region, where these two deep anticlines overlap, is characterized by duplex structures, and extends about 18 km. The shallow anticline is migrated southward displaying obvious “S” form in this area.

关键词： displacement transfer fault-bend folding reverse symmetry model infinitely equal division model Qiulitag zone.

Mn content of reservoir calcite cement: A novel inorganic geotracer of secondary petroleum migration in the tectonically complex Junggar Basin (NW china)

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Science china Earth Sciences 2007年第12期50卷 1796-1809页

作者： CAO Jian1,HU WenXuan1,YAO SuPing1,ZHANG YiJie2,WANG XuLong3,ZHANG YueQian3,TANG Yong3 & SHI XinPu3 1 State Key Laboratory for Mineral Deposit research,Department of Earth Sciences,Nanjing University,Nanjing 210093,china 2.research Institute of exploration and development,petrochina,Beijing 100083,china 3 research Institute of exploration and development,petrochina Xinjiang oilfield company,Karamay 834000,china 1. State Key Laboratory for Mineral Deposit research Department of Earth Sciences Nanjing University Nanjing 210093 China 2. research Institute of exploration and development PetroChina Beijing 100083 China 3. research Institute of exploration and development PetroChina Xinjiang Oilfield Company Karamay 834000 China

Electronic probe microanalysis(EPMA) results of reservoir calcite cement from fourteen core samples in the Junggar Basin show that Mn-content varies largely between different samples from below the detect limitation to 4.14%,while it displays a generally good correlation with oil-gas ***,therefore,likely indicates that concentration of the Mn-content of the calcite cement has a close rela-tion to the intensity of petroleum fluid charging during hydrocarbon secondary *** order to assess this hypothesis,oxygen and strontium isotopic measurements on sixteen calcite veins host in source sequences were carried out to investigate the feature of the oil-source petroleum *** results imply that during hydrocarbon generation and migration,deep hot fluid has dissolved volcanic minerals interlined between mudstone source *** Mn is a kind of typical trace element enriched in volcanic rocks,it is reasonable to conclude that the petroleum fluid formed in the source sequences would be ***,calcite cements precipitated from such Mn-rich petroleum fluid would be Mn-rich *** to the geologic chromatographic effect during migration along reservoir rocks,the decreasing of the Mn-content of the reservoir calcite cements indicates the migration ***,this novel geotracer was further successfully applied in the study of hydrocarbon migration in the Junggar Basin in combination with organic geochemical analyses during the hydrocarbon *** Mn content of the reservoir calcite cement appears promising as a novel inorganic geotracer for the petroleum *** paper represents a search for novel indicators of secondary petroleum migration in tectonically complex basins based on fundamentals of the reservoir fluid-rock interactions.

关键词： Petroleum migration, inorganic geochemistry, water-rock interaction, reservoir calcite cement, the Junggar Basin

Detection of water in petroleum inclusions and its implications

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Science Bulletin 2006年第12期51卷 1501-1507页

作者： CAO Jian1, YAO Suping1, HU Wenxuan1, ZHANG Yijie2, WANG Xulong3, ZHANG Yueqian3 & TANG Yong3 1. State Key Laboratory for Mineral Deposit research, Department of Earth Sciences, Nanjing University, Nanjing 210093, china 2. research Institute of exploration and development, petrochina, Bei- jing 100083, china 3. research Institute of exploration and development, Xinjiang oilfield company, petrochina, Karamay 834000, china State Key Laboratory for Mineral Deposit research Department of Earth Sciences Nanjing University Nanjing 210093 China research Institute of exploration and development PetroChina Beijing 100083 China research Institute of exploration and development Xinjiang Oilfield Company PetroChina Karamay 834000 China

FTIR spectra of inclusions sampled from fault-zone reservoirs of the northwestern Junggar Basin show that water, with different abundances, does exist in petroleum inclusions. It is thus implied that petroleum inclusions can seldom form without water. Different inclusions hosted in one single grain, and formed in one oil charging phase, have a largely varied ratio of water to oil and slightly changed CH3/CH2 ratio. This likely provides evidence for fault-related episodic migration and accumulation of hydrocarbons.

关键词： water in petroleum inclusions forming mechanism of inclusions episodic migration and accumulation of hydrocarbons FTIR microspectroscopy Junggar Basin.

Geochemical characteristics and origin of gases from the Upper,Lower Paleozoic and the Mesozoic reservoirs in the Ordos Basin,china

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Science china Earth Sciences 2008年第S1期51卷 183-194页

作者： HU AnPing 1 ,Li Jian 2 ,ZHANG WenZheng 3 ,LI ZhiSheng 2 ,HOU Lu 4 &LIU QuanYou 5 1 Department of Earth Sciences,Zhejiang University,Hangzhou 310027,china 2 Langfang Branch,Reasearch Institute of Petroleum exploration and development,petrochina,Langfang 065007,china 3 Institute of exploration and development,petrochina Changqing oilfield company,Xi’an 710021,china 4 University of Petroleum,Beijing102249,china 5 petrochina research Institute of Petroleum exploration and development,Beijing 100083,china 1. Department of Earth Sciences Zhejiang University Hangzhou 310027 China2. Langfang Branch Reasearch Institute of Petroleum Exploration and Development PetroChina Langfang 065007 China3. Institute of Exploration and Development PetroChina Changqing Oilfield Company Xi’an 710021 China4. University of Petroleum Beijing 102249 China5. PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083 China

The Ordos Basin,the second largest sedimentary basin in china,contains the broad distribution of natural gas *** far,several giant gas fields have been discovered in the Upper and Lower Paleozoic in this basin,each having over 1000×10 8 m 3 of proven gas reserves,and several gas pools have also been discovered in the *** paper collected the data of natural gases and elucidated the geochemical characteristics of gases from different reservoirs,and then discussed their *** hydrocarbons preserved in the Upper Paleozoic,the elevatedδ13C values of methane,ethane and propane indicate that the gases would be mainly coal-formed gases;the singular reversal in the stable carbon isotopes of gaseous alkanes suggests the mixed gases from humic sources with different *** the Lower Paleozoic,theδ13C 1 values are mostly similar with those in the Upper Paleozoic,but theδ13C 2 andδ13C 3 values are slightly lighter,suggesting that the gases would be mixing of coal-type gases as a main member and oil-type *** are multiple reversals in carbon isotopes for gaseous alkanes,especially abnormal reversal for methane and ethane(i.e.δ13C 1 >δ13C 2 ),inferring that gases would be mixed between high-mature coal-formed gases and oil-type *** the Mesozoic,the δ13Cvalues for gaseous alkanes are enriched in 12C,indicating that the gases are mainly derived from sapropelic sources;the carbon isotopic reversal for propane and butane in the Mesozoic is caused by microbial oxidation and mixing of gases from sapropelic sources with different *** contrast to the Upper Paleozoic gases,the Mesozoic gases are characterized by heavier carbon isotopes of iso-butane than normal butane,which may be caused by gases generated from different kerogen types. Finally,according toδ13C 1 -Ro relationship and extremely low total organic carbon contents,the Low Paleozoic gases would not be generated from the Ordovician source as a main gas source,bycontrast, the Upper Pale

关键词： Ordos Basin natural gas chemical composition carbon isotope genesis