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Petroleum in the Jurassic Reservoirs within the Eastern Fukang Sub-depression,Junggar Basin,NW China:correlation and source rock

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 777-795页

作者： CHENG Bin LIU Hua ZHANG Kuihua REN Xincheng MENG Xiangyu LIU Dezhi Shandong Provincial Key Laboratory of Deep oil and Gas China University of Petroleum(East China)QingdaoShandong 266580China Shandong Provincial Key Laboratory of Reservoir Geology China University of Petroleum(East China)QingdaoShandong 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266071China Sinopec Shengli oilfield Company DongyingShandong 257000China

The origin and source of the petroleum in the Jurassic reservoirs within the eastern Fukang sub-depression were geochemically *** show thermal maturities matching the peak generation stage,while the condensates are at the early stage of intense *** and condensates may have experienced mild evaporative fractionation,while mixing of severely biodegraded with non-biodegraded oils has *** biomarkers and isotopes,petroleums were classified into GroupⅠ,ⅡandⅢgenetic groups,with GroupⅢfurther divided intoⅢa andⅢb ***Ⅰpetroleum displays heavy carbon isotopes,a strong predominance of pristine over phytane,high C_(19)and C_(20)tricyclic and C_(24)tetracyclic terpanes,low gammacerane,and dominant C_(29)steranes,while GroupⅡshows light carbon isotopes,a predominance of phytane over pristine,high C_(21)and C_(23)tricyclic with low C_(24)tetracyclic terpanes,high gammacerane and dominant C_(27)***Ⅲa petroleum shows mixing compositions of GroupⅠandⅡ,while GroupⅢb displays similar compositions to Group I,but with significantly higher Ts,C_(29)Ts and C_(30)diahopane ***-source rock correlation suggests GroupⅠandⅡpetroleums originate from Jurassic and Permian source rocks,respectively,while GroupⅢa are mixtures sourced from these rocks andⅢb are mixtures from Jurassic and Triassic source rocks.

关键词： biomarkers oil-source rock correlation Jurassic reservoirs Fukang sub-depression Junggar Basin

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Origin of oils in“Subtle pools”in the Dongying Depression,Bohai Bay Basin, China

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Acta Geologica Sinica(English Edition) 2008年第1期82卷 184-196页

作者： LI Sumei JIANG Zhengxue LIU Keyu QIU Guiqiang GAO Yongjin State key laboratory of petroleum resource andprospecting Beijing 102249 China Basin ＆ Reservoir Research Center University of Petroleum Beijing 102249 China CSIRO Petroleum P.O. Box 1130 Bentley WA 6102 Australia Shengli oilfield Company Limited SINOPEC Dongying 257015 China

Subtle traps or oil pools have become an important exploration play in the Dongying Depression, Bohai Bay Basin, east China. Despite recent successes in exploration, the formation mechanisms of subtle traps are still not well understood. The majority of subtle oil pools in the Dongying Depression are developed in the middle interval of the Es3 Member of the Paleogene Shahejie Formation with the subtle traps being primarily of lenticular basin-floor turbidite sands encompassed in mudstones. oil in the subtle traps was previously thought to have migrated directly from the surrounding source rocks of the same formation （Es3）. Detailed geochemical investigation of 41 oils and 41 rock samples from the depression now indicates that the oils from the subtle traps cannot be correlated well with the surrounding Es3 source rocks, which are characterized by high Pr/ Ph （〉1）, low Gammacerane/C30hopane, representing a freshwater lacustrine setting. In contrast the oils features low Pr/Ph （〈1） and relatively high Gammacerane content, showing a genetic affinity with the underlying Es4 source rocks, which also have the same qualities, indicating a brackish lacustrine setting. oils in the Es3 subtle traps are probably derived from mixed sources with the contribution from the upper Es4 source rocks predominating. Therefore unconventional oil migration and accumulation mechanisms need to be invoked to explain the pooling of oils from the ES4 source rocks, which probably came through a thick low interval of the Es3 source rocks with no apparent structural or stratigraphic pathways. We suggest that the subtle oil migration pathway probably plays an important role here. This finding may have significant implications for future exploration and the remaining resource evaluation in the Dongying Depression.

关键词： lenticular oil pools biomarkers oil-source rock correlation hydrocarbon migration and accumulation subtle oil migration pathway

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