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Control of neotectonic movement on hydrocarbon accumulation in the kuqa foreland basin,west China

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Petroleum Science 2010年第1期7卷 49-58页

作者： Jiang Zhenxue Li Lianxia Song Yan Tian Fenghua Zhao Mengjun Wang Haijiang Zhao Zhenxing State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China basin and Reservoir Research Center China University of Petroleum Beijing 102249 China Exploration and Development Research Institute PetroChina Beijing 100083 China Department of Exploration ＆ Development PetroChina CBM Limited Company Beijing 100013 China Exploration Department Tarim Oilfield Company PetroChina Kuerle Xinjiang 841000 China No.8 Oil Production Plant Changqing Oilfield Company PetroChina Xi＇an Shaanxi 710018 China

Neotectonic movement refers to the tectonic movement that has happened since the Cenozoic, which is the latest movement. It has the most important influence on the basins in west China, especially on the hydrocarbon accumulation in the western foreland basins. We determined the time of neotectonic movement in the kuqa foreland basin, which began from the Neogene, and analyzed the patterns of movement, which were continuous and fast subsidence in the vertical direction and intense lateral compression. The structure styles are that the faulting is weakened and the folding is strengthened gradually from north to south. We studied the control of neotectonic movement on the hydrocarbon accumulation process and model in the kuqa foreland basin with basin simulation technique. The largest subsidence rate of the kuqa foreland basin reached 1,200 m/Ma during the neotectonic movement, leading to rapid maturing of source rock within 5 Ma and a large quantity of hydrocarbon being generated and expelled. The thick neotectonic strata can form high quality reservoirs with the proved gas and oil reserves accounting for 5% and 27% of the total reserves, respectively. 86% of the structural traps were formed in the neotectonic movement period. The faults formed during the neotectonic movement serve as important migration pathways and they exist in the region where the hydrocarbon reservoirs are distributed. Abnormally high pressure caused by the intense lateral compression, thick neotectonic strata deposition and rapid hydrocarbon generation provide driving force for hydrocarbon migration. The accumulation elements match each other well over a short period, leading to many large gas fields formed later in the kuqa foreland basin.

关键词： kuqa foreland basin neotectonic movement accumulation element accumulation process accumulation model

Geochemical Characteristics and Origin of Crude Oil and Natural Gas in the Southern Slope Zone,kuqa foreland basin,NW China

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Journal of Earth Science 2022年第3期33卷 820-830页

作者： Chun Liu Shijia Chen Jilong Zhao Zhou Su Hui Rong School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China PetroChina Research Institute of Geology in Hangzhou Hangzhou 310023China Exploration and Development Research Institute PetroChina Tarim Oilfield CompanyKorla 841000China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China

Continuous exploration has triggered a heated debate on hydrocarbon resource potential in the southern slope zone of the kuqa foreland basin,and sources of the Mesozoic-Cenozoic oil and gas have become a key problem to be solved in this *** and organic geochemical parameters of crude oil and natural gas from the southern slope zone of the kuqa foreland basin were illustrated in order to reveal their origin by using a combination of gas chromatograph(GC),gas chromatogram-mass spectrum(GC-MS)and carbon isotope *** characteristics of crude oil,such as low density,viscosity,solidification point and sulfur content,and high wax content,indicate that source of the crude oil is *** biomarker compositions of crude oil are characterized by low to medium molecular weight compounds(n-C_(12) to n-C_(20)),high Pr/Ph ratios(>1.0),low phytane/n-C18 ratios(0.06-0.54),and predominant regular sterane C_(29).All biomarker parameters clearly indicate that the crude oil was derived mainly from algae and aquatic plankton and deposited under weak reduction-oxidation environment,and has the characteristics of mixed *** Cretaceous crude oil was mainly derived from the Triassic lacustrine source rocks,which also contributed to the Paleogene crude oil together with Jurassic coal source *** gas is characterized by moderate methane content,high heavy hydrocarbon and nitrogen content,and no hydrogen *** methane and ethane in Paleogene natural gas are relatively rich in ^(13)C withδ^(13)C_(1) andδ^(13)C_(2) values ranging from-37.3‰to-31.2‰(mean=-34.25‰)and from-25‰to-21.3‰(mean=-23.09‰),respectively,indicating the coal-derived gas from the Middle and Lower Jurassic *** products in the southern slope zone of the kuqa foreland basin are primarily generated from source rocks in the mature *** low-amplitude structural and lithologic traps with the updip pinch-out sand bodies or plugging secondary fault at relatively h

关键词： crude oil natural gas oil and gas source organic geochemistry kuqa foreland basin

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Formation condition of deep gas reservoirs in tight sandstones in kuqa foreland basin

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Petroleum Research 2018年第4期3卷 346-358页

作者： Xuesong Lu Mengjun Zhao Keyu Liu Qingong Zhuo Junjia Fan Zhichao Yu Yanjie Gong PetroChina Research Institute of Petroleum Exploration and Development Beijing 100083China CNPC Key Laboratory of basin Structure and Hydrocarbon Accumulation Beijing 100083China School of Geosciences China University of PetroleumShandong 266580China

Due to the high expense of deep oil and gas exploration,prediction of gas-bearing properties before drilling is crucial for deep gas reservoir of tight *** tight sandstone gas fields in kuqa foreland basin are characterized by high abundance,high gas saturation,high pressure,high and stable yield,which belong to high-efficiency tight gas *** on theoretical analysis of controlling factors and mechanisms of gas-bearing properties for tight sandstone gas reservoir,and taking tight sandstone gas fields with high effectiveness such as Dibei,Keshen and Dibei gas fields in kuqa foreland basin as examples,formation condition and mechanism of high-efficiency tight sandstone gas reservoir in kuqa area are studied through a comparative analysis of typical tight sandstone gas reservoir in Sichuan basin and Ordos *** results show that the formation condition of deep gas reservoir of tight sandstone in kuqa foreland basin includes four factors:i.e.,overpressure gas charging,fracture development,“early-oil and late-gas”accumulation process and favorable preservation *** overpressure gas charging and fracture development are the most important factors for formation of high-efficiency tight gas reservoirs in kuqa foreland ***-quality source rocks,high sourcereservoir pressure difference,and overpressure filling induced thereby are preconditions for formation of tight sandstone with high gas *** fracture development controls gas migration,accumulation,and high yield of tight sandstone gas *** reservoir wettability changed by the early oil charging is beneficial to late natural gas charging,and the preservation condition of high-quality gypsum cap rocks is the key factor for gas reservoirs to maintain overpressure and high gas *** of above four favorable factors leads to the tight sandstone gas reservoir with high abundance,high gas saturation and high gas production in kuqa foreland basin,which is very

关键词： Deep gas reservoir Tight sandstone Overpressure Fracture “Early-oil and late-gas”accumulation process Preservation condition kuqa foreland basin

Comparison of kuqa foreland basin with Persian Gulf basin in salt tectonics

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Global Geology 2007年第2期10卷 156-165页

作者： Guimei WAN Liangjie TANG Wenzheng JIN basin and Reservoir Research Centre China University of Petroleum Beijing 102249 China Key Laboratory for Hydrocarbon Accumulation Mechanism of Ministry of Education ChinaUniversity of Petroleum Ministry of Education Beijing 102249 China

Compared kuqa foreland basin with Persian Gulf basin in development of salt layers, salt tectonics, and the relation between salt tectonics and hydrocarbon, it is concluded that the salt diapirs are relative to hydrocarbon. Searching salt diapirs and related traps in kuqa foreland basin is important. The forming mechanism of salt tectonic in kuqa foreland basin is different from that of Hormuz Series, but similar to that of Lower Fars Series/Gachsaran Formation. Inspired by the role of salt tectonics of Lower Fars Series/Gaehsaran Formation in hydrocarbon accumulation, the authors considered that the exploration below salt layer should be enforced, and the traps below salt layer in the southern part of the kuqa foreland basin would be found where salt layer is thicker. On the contrary, the traps should be found both above and below the salt layer in front of the northern mountain where salt layer is thin. The Triassic and Jurassic source rocks are rich in this area with great exploration prospective.

关键词： kuqa foreland basin Persian Gulf basin salt tectonics comparison

Origin,migration and mixing of oilfield brines:Stable isotopic evidence from kuqa foreland basin

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Origin,migration and mixing of oilfield brines:Stable isotop...

Uplift and exhumation in the Tianshan,western China:New insights from detrital zircon morphology and thermochronology

中国科学院地质与地球物理研究所2001学术年会

作者：蔡春芳汪集旸曾凡刚何宏 Institute of Geology and Geophysics Chinese Academy of Sciences School of Environment and Resource Science Renmin University of China China University of Mining and Technology

Sr/Sr,δD andδO together with chemistry of oilfield brines,were measured from Cambrian to Neogene strata in the kuqa foreland basin,northwest *** brines have Sr/Sr ratios ranging from 0.70944 to 0.71716,δD values from -33‰to -67‰andδO from -9.0‰to 3.9‰.The most radiogenic Sr brines have relatively heavyδO in the Cambro- Ordovician carbonates,and are suggested to originate from crystalline basement.δD andδO systematics show that all the brines slope to Global Meteoric Water Line,and intersect atδD = -60‰andδO = -8.8‰,close to that of present-day local meteoric water,suggesting that meteoric water has mixed with evaporated ancient meteoric *** saline samples have the lowestδD andδO contents and molar Na/Cl ratios of more than *** from salt dissolution.

关键词： 87Sr86Sr.δD andδ18O origin migration brines kuqa foreland basin

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Science China Earth Sciences 2022年第3期65卷 449-461页

作者： Jian CHANG Yinglin ZHANG Nansheng QIU Chenxing LI State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China College of Geosciences China University of PetroleumBeijing 102249China

The Tianshan in western China is rich in ore resources,but its tectonic uplift and exhumation history closely related to the resource exploration is still *** study provides a new strategy to uncover the tectonic uplift processes in southern Tianshan by combining the morphological characteristics and thermochronological ages of detrital zircons in the Tarim *** morphology of the Meso-Cenozoic detrital zircons in the kuqa foreland basin,a secondary tectonic unit of the Tarim basin,is dominated by three types of P,S,and G,and their average alkaline and temperature indexes are 668.0-677.2 and 347.6-413.5,***,the U-Pb ages of these detrital zircons are primarily divided into two groups of 270-330 and 380-470 *** features indicate that the Early Carboniferous-Early Permian and Middle Ordovician-Middle Devonian alkaline granites distributed in the South Tianshan and southern Central Tianshan were the main sources of the detrital zircons in the kuqa foreland *** decomposition of the detrital zircon fission track ages further reveals that the provenances of the kuqa foreland basin primarily consisted of the southern Central Tianshan,the eastern South Tianshan,and the central South Tianshan during *** them,the eastern South Tianshan played a dominant role in the material *** synthesis of the decomposed zircon fission track(ZFT)ages and the lag-time evolution pattern indicated that the South Tianshan and the southern Central Tianshan mainly experienced five stages of tectonic uplifting that occurred in the Devonian,the Permian,the Middle Triassic-Middle Jurassic,the Cretaceous,and since the Miocene,*** were related to the subduction of the South Tianshan Ocean northward to the bottom of the Central Tianshan,the compression and accretion after the closure of the South Tianshan Ocean,and a series of collisions between the Qiangtang-Lassa-India plates and the southern margin of the Eurasia pla

关键词： Tianshan kuqa foreland basin Provenance analysis Zircon morphology Thermochronology Lag-time evolution

Influence of Salt Beds on the Segmentation of Structure and Hydrocarbon Accumulation in Qiulitag Structural Belt,Tarim basin,China

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Journal of China University of Geosciences 2008年第2期19卷 162-173页

作者：范秋海吕修祥杨明慧谢会文 basin and Reservoir Research Center China University of Petroleum Tarim Oil Company PetroChina

Seismic information and balanced profile technology were used to reveal the influence of the salt bed in segmentation of structure and hydrocarbon accumulation in Qiulitag structural belt in Tarim basin. From west to east, the shortening of strata above the salt beds gradually decreases, while, the shortening below the salt beds gradually increases, which shows that the segmentation of structure integrated the seismic profile. There is great difference of the deformation of strata below and above the salt beds between the west segment and the east segment. The analysis of the distribution of oil/gas fields and the hydrocarbon properties indicates the similar segmentation to the structure segmentation. The salt beds in relatively shallow layers change the stress condition from basement of kuqa foreland basin, which leads to the segmentation of Qiulitag structural belt. Because the salt beds in the west segment came into being earlier than those in the east segment, the west segment captures hydrocarbon from two sets of source rock, while the east segment can only capture hydrocarbons from one set of source rock. So, the salt beds play an important role in the segmentation of structure and hydrocarbon accumulation.

关键词： kuqa foreland basin Qiulitag structural belt salt bed segmentation hydrocarbon accumulation.