Oil & Gas Geology ›› 2019, Vol. 40 ›› Issue (3): 558-570.doi: 10.11743/ogg20190311

• Petroleum Geology • Previous Articles     Next Articles

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

Li Zhiming1,2,3, Tao Guoliang1,2,3, Li Maowen1,2,3, Qian Menhui1,2,3, Xie Xiaomin1,2,3, Jiang Qigui1,2,3, Liu Peng1,2,3, Bao Yunjie1,2,3, Xia Dongling4   

  1. 1. Wuxi Research Institute of Petroleum Geology, Petroleum Exploration and Production Research Institute, SINOPEC, Wuxi, Jiangsu 214126, China;
    2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, Jiangsu 214126, China;
    3. Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi, Jiangsu 214126, China;
    4. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
  • Received:2019-01-20 Revised:2019-03-11 Online:2019-06-28 Published:2019-04-26

Abstract: To discuss the prospecting potential of shale oil in the 3rd 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: