Geological characteristics and exploration prospect of shale oil in Permian Lucaogou Formation, Santanghu Basin

doi:10.3969/j.issn.1672-7703.2021.04.010

Abstract

Abstract: Permian Lucaogou Formation, mainly composed of mixed fi ne-grained sediments in salinized continental lake basin, is the most important source rock in Santanghu Basin, which has favorable conditions for forming shale oil reservoir. At present, several large-scale reserve areas have been found in Malang and Tiaohu Sags. Based on the early achievements, this paper studies the existing geological data,systematically sorts out the geological conditions for forming shale oil reservoir in Lucaogou Formation, summarizes the exploration and development progress and existing problems, and discusses the exploration prospect and potential targets for the next step. The results show that: (1) The interbedded mixed fi ne-grained sediments are developed in the salinized continental lake basin; (2) High quality source rocks are widely distributed with good material basis for hydrocarbon generation; (3) “Sweet spot” reservoir is developed with good reservoir space of thick tuff and dolomite; (4) Retention hydrocarbon expulsion, near source charging, and in-situ hydrocarbon accumulation; (5) The physical properties of crude oil are complex, with high mobility shale oil developed locally; (6) The reservoir is rich in quartz, carbonate and other brittle minerals, which is conducive to reservoir fracturing. According to preliminary evaluation, the geological resources of shale oil in Lucaogou Formation are nearly 395 million tons, with great exploration potential. In recent years, a series of progress has been made in seismic prediction, logging evaluation, horizontal well drilling and completion, fracturing and other aspects through integrated and collaborative research, which has achieved good results and strengthened the confi dence of Tuha Oilfi eld Company in shale oil exploration and development.In the future, the high mature light shale oil in the western margin of Malang Sag-southern margin of Tiaohu Sag, and near source shale oil of tight sandstone in the southern margin of Malang Sag are new fi elds for shale oil exploration in Santanghu Basin.

CLC Number:

TE111.1

Fan Tanguang, Xu Xiongfei, Fan Liang, Feng Yaqin, Liu Wenhui, Liu Juntian, Wang Meiyan, Jia Guoqiang. Geological characteristics and exploration prospect of shale oil in Permian Lucaogou Formation, Santanghu Basin[J]. China Petroleum Exploration, 2021, 26(4): 125-136.

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