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Natural gas characteristics and gas-source comparisons of the Lower Triassic Feixianguan Formation,eastern sichuan basin,China

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Petroleum Science 2023年第3期20卷 1458-1470页

作者： Zi-Yun Zheng Yin-Hui Zuo Hua-Guo Wen De-Ming Li Yang Luo Jia-Zhen Zhang Mei-Hua Yang Jian-Cheng Zeng State Key Laboratory of Oiland Gas Gelogy and Exploitation Chengdu University of TechnologyChengduSichuan610059China PetroChina Southwest Oil&Gas Field Company ChengduSichuan610051China

There is great controversy regarding the origin and source of natural gas in the Lower Triassic Feix-ianguan Formation in the eastern sichuan basin.This seriously restricts the study of natural gas dy-namics in the Feixianguan Formation and thus hampers natural gas exploration in the region,so further study is urgently required.Using experimental tests of natural gas composition,stable isotopes,and noble gas isotopes with gas chromatography(GC)and mass spectrometry(MS)studies of source rock and reservoir asphalt saturated hydrocarbons,the natural gas geochemical characteristics,the genetic identification and a gas-source comparison of the Feixianguan Formation were studied.Then,con-strained by the thermal history,the histories of gas generation and expulsion were restored by basin simulation technology.Finally,a gas accumulation model was established for the Feixianguan Formation.The results showed that(1)the H_(2)S-rich and H2S-poor gas reservoirs of the Feixianguan Formation are distributed on the east and west sides of the Kaijiang-Liangping trough in the eastern sichuan basin,respectively.The carbon and hydrogen isotope compositions of the natural gas in the gas reservoirs are generally heavy and have typical characteristics of high-maturity dry gas reservoirs.(2)The natural gas of the Feixianguan Formation is organic thermogenic gas,which is mainly oil-type gas generated by the secondary cracking of crude oil.The gas-generating parent material is mainly type II kerogen.(3)The natural gas of the Feixianguan Formation in the eastern sichuan basin was mainly generated by argil-laceous source rocks of the Upper Permian Longtan Formation.(4)Natural gas accumulation occurred as follows:the paleo-structure heights were filled with crude oil in the Early Jurassic,and paleo-oil res-ervoirs were formed in the Feixianguan Formation;during the Middle-Late Jurassic,the paleo-oil res-ervoirs were cracked when the reservoir temperatures rose above 160 C,and paleo-gas reservoirs were formed.Since the end of the Late Jurassi

关键词： eastern sichuan basin Feixianguan Formation Natural gas origin Gas-source comparison Longtan Formation

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Superimposed hydrocarbon accumulation through multi-source and multi-stage evolution in the Cambrian Xixiangchi Group of eastern sichuan basin:A case study of the Pingqiao gas-bearing anticline

能源地球科学(英文)

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能源地球科学(英文) 2023年第1期4卷 131-142页

作者： Ziming Sun Sinopec Petroleum Exploration and Production Research Institute Beijing102206China

The Xixiangchi Group in eastern sichuan basin has great potential for natural gas exploration.However,there is a lack of in-depth studies of the hydrocarbon sources and the formation and evolution of gas reservoirs in this Group.Systematic investigation about the gas reservoir in Pingqiao anticline was consequently carried out in terms of characteristics of reservoir bitumen,the geochemical characteristics of natural gas,diagenetic minerals,and fluid inclusions.Based on this,combined with the reconstruction of the burial history,thermal evolution history and uplifting history of strata,and analysis of the regional tectonic settings,the hydrocarbon sources were identified and the formation and evolutionary processes of the gas reservoirs in Xixiangchi Group was revealed in this study.It was shown that the gas reservoirs have mixed gas sources from the shale source rocks in the Lower Cambrian Qiongzhusi Formation and in the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation,and experienced several evolutionary stages,including the paleo-oil reservoir stage from the Late Siliurian to the Middle Permian,the paleo-gas reservoir stage from the Late Permian to the Early Cretaceous,and the superimposed accumulation and mixed-source gas reservoir stage since the Late Cretaceous.The mixed-source gas reservoir is formed by the adjustment of the Xixiangchi Group paleo-gas reservoirs and depressurization of the overpressure Wufeng-Longmaxi shale gas reservoirs and the charging of gas into the Xixiangchi Group reservoir of the Pingqiao anticline since the Late Cretaceous,which show obvious superimposed accumulation characteristics.There are different accumulation patterns in different geological periods.The accumulation pattern of the“old source-young reservoir”(i.***.hydrocarbons generated from older source rocks accumulating in younger reservoirs)dominates before the Late Cretaceous,and that of“juxtaposed young source-old reservoir”(i.***.hydrocarbons generated from younger source rocks accumulating in juxtapose

关键词： Superimposed accumulation model Natural gas Xixiangchi group Cambrian eastern sichuan basin

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Depositional System of the Carboniferous Huanglong Formation,eastern sichuan basin:Constraints from Sedimentology and Geochemistry

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Acta Geologica Sinica(English Edition) 2016年第5期90卷 1795-1808页

作者： WANG Kun HU Suyun LI Wei LIU Wei HUANG Qingyu MA Kui SHI Shuyuan Research Institute of Petroleum Exploration and Development CNPC

Using analyses of the lithology,sequences,paleoenvironment,and tectonic setting,the depositional system of the Carboniferous Huanglong Formation in the eastern sichuan basin was identified.The lithological characteristics of the Lower Member,Middle Member,and Upper Member were analyzed and classified.Before the use of carbon,oxygen,and strontium isotopes in the analysis,all of the geochemical data were tested for validity.On the basis of the Z values obtained from carbon and oxygen isotopes,the paleoenvironments of the three members were elucidated.Lower Member was dominantly an enclosed marine environment with intense evaporation and little freshwater input into the sea.Middle Member developed in a semi-enclosed to normal marine environment with many rivers.Upper Member was formed in a normal marine environment.The east sichuan basin was enclosed by paleouplifts before the deposition of the Huanglong Formation,forming a relatively enclosed depositional setting.Paleogullies developed in the Silurian strata that underlie the Carboniferous rocks;these paleogullies can be identified.On the basis of a comprehensive analysis,we propose that the Huanglong Formation developed in a platform system.Four microfacies were identified：supratidal flat,dolostone flat,grain shoal,and shelf microfacies.The high-permeability and high-porosity characteristics of the grain shoal microfacies are favorable for hydrocarbon accumulation,while the supratidal flat and shelf microfacies developed very few high-quality reservoirs.The paleogullies,in which increased amounts of grain shoal microfacies developed,controlled the distribution of high-quality reservoirs.

关键词： eastern sichuan basin Huanglong Formation depositional system paleoenvironment paleogully reservoir quality

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Nanoscale Pore Characteristics of the Upper Permian Mudrocks from a Transitional Environment in and around eastern sichuan basin, China

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 1025-1046页

作者： CAO Taotao LIU Guangxiang LIU Hu DENG Mo HAN Yuanhong HUANG Yanran Andrew S.HURSTHOUSE Hunan Provincial Key Laboratory of Shale Gas Resource Utilization Hunan University of Science and TechnologyXiangtanHunan 411201China Department of Geology Hunan University of Science and TechnologyXiangtanHunan 411201China Wuxi Research Institute of Petroleum Geology Petroleum Exploration and Production Research InstituteSINOPECWuxiJiangsu 214126China sichuan Key Laboratory of Shale Gas Evaluation and Exploration Chengdu 600091China Key Laboratory of Coal Resources Exploration and Comprehensive Utilization Ministry of Land and ResourcesXi’an 710021China School of Science and Sport University of the West of ScotlandPaisley P A12BEUK

Nanoscale pore characteristics of the Upper Permian Longtan transitional mudrocks and their equivalent strata Wujiaping Formation marine mudrocks in and around the eastern sichuan basin was investigated using field emission scanning electron microscopy(FE-SEM)and low-pressure N2 adsorption experiments.The results indicate that the Upper Permian mudrock is at a mature stage with total organic carbon(TOC)values ranging between 0.47%and 12.3%.The Longtan mudrocks mainly contain vitrinite,and their mineral composition is primarily clay.In contrast,the Wujiaping mudrocks are dominated by sapropelinite and solid bitumen,and their mineral compositions are mainly quartz and a notably high amount of pyrite.The FE-SEM reveals that clay mineral pores and microcracks are the common pore types in the Longtan mudrocks.The specific surface area and pore volume depend on the clay content but are negatively correlated with the TOC.The generation of nanometer pores in the Longtan mudrocks is caused by high clay mineral contents.Meanwhile,the Wujiaping mudrock mainly contains OM pores,and the pore parameters are positively correlated with the TOC.The OM pore development exhibits remarkable differences in the Longtan and Wujiaping mudrocks,which might be related to their sedimentary facies and maceral fractions.Vitrinite and inertinite appear as discrete particles in these mudrocks and cannot generate pores during thermal maturation.Sapropelinite often contains many secondary pores,and solid bitumen with large particles,usually with several pores,is not the major contributor to the pore system of the investigated mudrock.

关键词： nanoscale pore characteristics FE-SEM low-pressure N2 adsorption transitional mudrock Longtan/Wujiaping Formation eastern sichuan basin

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Geochemical characteristics and diagenetic systems of dolomite reservoirs of the Changxing Formation in the eastern sichuan basin, China

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Petroleum Science 2012年第2期9卷 141-153页

作者： Zhang Bing Zheng Rongcai Wang Xuben Zheng Chao Wen Huaguo Luo Yuan Chi Yuelong State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering Chengdu University of TechnologySichuan 610059China Chongqing Gas Mine PetroChina Southwest Oil and Gasfield CompanyChongqing 401120China sichuan Science and Technology Worker University Sichuan 610059China

In order to discuss the relationship between dolomite reservoirs and diagenetic systems of the Changxing Formation, we studied carbon, oxygen and strontium stable isotopes, iron, manganese and strontium trace elements and the Mg/Ca （mol%） ratio, dolomite order degree, and determined that burial dolomitization is the key to controlling the distribution of high quality dolomite reservoir in the Changxing Formation in the eastern sichuan basin. The dolomite of the Changxing Formation is divided into four diagenetic systems：（1） penecontemporaneous stage syngenetic brine diagenetic system, （2） early diagenetic stage strata seal brine diagenetic system, （3） middle-late diagenetic stage mixed hot brine diagenetic system and （4） tectonic uplift stage mixed hydrothermal fluid diagenetic system. New understanding of the controlling factors and distribution of dolomite reservoir development is discussed. Reef shoal facies belts controlled regional reservoir distribution and the scale of development. Burial dolomitization of a strata seal brine diagenetic system is the foundation of reservoir development, mainly developing pore reservoir. Burial dolomitization of mixed hot brine diagenetic system expanded the reservoir distribution and improved the reservoir quality, mainly developing pore-vug reservoir. Fracturing and dissolution of a mixed hydrothermal fluid diagenetic system is the key to improving the reservoir quality, mainly developing pore-vug-crack complex reservoirs.

关键词： eastern sichuan basin Changxing Formation dolomite reservoir diagenesis geochemical characteristics diagenetic system

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