鄂尔多斯盆地西南部彬长区块三叠系延长组7段3亚段页岩油勘探前景探讨

doi:10.11743/ogg20190311

Abstract

Abstract: To discuss the prospecting potential of shale oil in the 3^rd sub-member of the Triassic Chang 7 member(Chang 7³) in Binchang block,southwestern Ordos Basin,the oil content and oil occurrence of typical rock types in Well B-1 were systematically observed and evaluated based on systematic observation and description of cores and using the results of Rock-Eval pyrolysis,thermovaporization in different temperature ranges and organic petrological analysis in combination with scanned images of cores with white light and fluorescence.The results show that the cored interval in Chang 7³ from Well B-1 is quality source rock at early stage of major oil window.The black laminated shale and layered mudstone are characterized by high oil content but dominance of immobile oil,and the average OSI is 45 mg/g(n=116),indicating no prospecting potential for shale oil.Whereas,the gray-brown laminated,thin-bedded and massive tuff and the interbedded tuffaceous(argillaceous) siltstone are characterized by high oil content,predominance of free oil and contributions from migrated oil.The oil mainly occurs in microfractures,intergranular pores and grain boundary fractures of detrital minerals,and its average OSI is 200 mg/g(n=28),indicating good prospecting potential for shale oil.In conclusion,the gray-brown tuff and the interbedded tuffaceous(argillaceous) siltstone on the Yishan slope in Binchang block are favorable intervals for shale oil exploration and have some shale oil prospecting potential.

Key words: oil content, Yanchang Formation, shale oil, Binchang block, Ordos Basin

CLC Number:

TE122.1

Li Zhiming, Tao Guoliang, Li Maowen, Qian Menhui, Xie Xiaomin, Jiang Qigui, Liu Peng, Bao Yunjie, Xia Dongling. Discussion on prospecting potential of shale oil in the 3^rd sub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin[J]. Oil & Gas Geology, 2019, 40(3): 558-570.

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Discussion on prospecting potential of shale oil in the 3^rd sub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin

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Discussion on prospecting potential of shale oil in the 3rd sub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin

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Discussion on prospecting potential of shale oil in the 3^rd sub-member of the Triassic Chang 7 member in Binchang block,southwestern Ordos Basin