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Fault reactivation in No.4 structural zone and its control on oil and gas accumulation in Nanpu sag,Bohai Bay Basin,China

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Petroleum Exploration and Development 2022年第4期49卷 824-836页

作者： LIU Lu SUN Yonghe CHEN Chang LOU Rui WANG Qi Earth Science College Northeast Petroleum UniversityDaqing 163318China Institute of Chongqing Unconventional Oil and Gas Development Chongqing University of Science and TechnologyChongqing 401331China Chongqing Key Laboratory of Complex Oil&Gas Field Exploration and Development Chongqing 401331China Liaohe Oilfield Company CNPCPanjin 124010China

Based on seismic and drilling data,the reactivation mechanism of the pre-existing basement F4 strike-slip faultin Nanpu sag and its controlling effect on hydrocarbon accumulation difference are systematically studied.By defining fault activation stages,back-stripping fault throw and physical modeling,it is found that the Nanpu No.4 structural zone formed by the Cenozoic reactivity of the F4 fault grew from south to north,with strike-slip deformation dominated in the south and extensional deformation dominated in the north.Faults in the No.4 structural zone and those in the adjacent No.2 and No.3 structural zones were different fault systems,which grew separately,contacted and connected,and finally interwove under the action of unified stress field.By constructing the identification chart of deformation mechanisms of reactivation of pre-existing faults,it is concluded that during the sedimentary period of the Paleogene Shahejie Formation,F4 fault was reactivated by strike-slip faulting,and during the sedimentary period of Paleogene Dongying Formation and Neogene Guantao-Minghuazhen formations,it was reactivated by oblique extension.The controlling effects of Cenozoic reactivation of F4 fault on hydrocarbon accumulation include:(1)As the oil-source fault,it controlled the vertical cross-layer migration of oil and gas.(2)It gave rise to strike-slip transfer zone to control the distribution of sand bodies.(3)It grew upward and interacted with faults in the neighboring area,controlling the formation of two types of traps,and was favorable for oil and gas accumulation.

关键词： Bohai Bay Basin Nanpu sag Cenozoic strike-slip fault pre-existing fault fault reactivation identification template physical simulation experiment hydrocarbon accumulation

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Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment

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Petroleum Exploration and Development 2022年第4期49卷 731-743页

作者： SHEN Anjiang LUO Xianying HU Anping QIAO Zhanfeng ZHANG Jie PetroChina Hangzhou Institute of Petroleum Geology Hangzhou 310023China Key Laboratory of Carbonate Reservoirs CNPCHangzhou 310023China

Aiming at the scientific problem that only part of dolomite acts as dolomite reservoir,this paper takes the multiple dolomite-bearing formations in the Tarim and Ordos basins,NW China and Sichuan Basin,SW China as the study object,by means of mineral petrological analysis and geochemical methods including carbonate clumped isotope,U-Pb isotopic dating,etc.,to rebuild the dolomitization pathway and evaluate its effects on reservoir formation.On the basis of detailed rock thin section observation,five dolomitic structural components are identified,including original fabric-retained dolomite(microbial and/or micrite structure),buried metasomatic dolomite I(subhedral-euhedral fine,medium and coarse crystalline structure),buried metasomatic dolomite II(allotriomorphic-subhedral fine,medium and coarse crystalline structure),buried precipitation dolomite and coarse crystalline saddle dolomite.Among them,the first three exist in the form of rocks,the latter two occur as dolomite minerals filling in pores and fractures.The corresponding petrological and geochemical identification templates for them are established.Based on the identification of the five dolomitic structural components,six dolomitization pathways for three types of reservoirs(preserved dolomite,reworked dolomite and limestone buried dolomitization)are distinguished.The initial porosity of the original rock before dolomitization and the dolomitization pathway are the main factors controlling the development of dolomite reservoirs.The preserved dolomite and reworked dolomite types have the most favorable dolomitization pathway for reservoir formation,and are large scale and controlled by sedimentary facies in development and distribution,making them the first choices for oil and gas exploration in deep carbonate formations.

关键词： dolomitization dolomitization pathway dolomite reservoir carbonates penecontemporaneous environment burial environment dolomite genesis identification template

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