Geological characteristics and exploration prospects of alkaline lake shale oil of the Fengcheng Formation, Hashan area,NW Junggar Basin
LIU Huimin1, WEN Huaguo2,3, ZHANG Kuihua1, GUO Pei2,3, ZHANG Guanlong4, YU Hongzhou4, XIONG Wei4, ZHOU Jian4, XU Wenli2,3, SONG Meiyuan4, LI Changzhi2,3
1 Sinopec Shengli Oilfield Company,Shandong Dongying 257001,China; 2 Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources,;Chengdu University of Technology,Chengdu 610059,China; 3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China; 4 Exploration and Development Institute of Sinopec Shengli Oilfield Company,Shandong Dongying 257015,China
Abstract：In recent years,the Permian Fengcheng Formation of the Mahu sag has become an important interval for shale oil exploration and newly discovered hydrocarbon reserves in the Junggar Basin. The Halaalate Mountain area(Hashan area)is located on the northern margin of the Mahu sag. Due to its proximity to the thrust belt and in the early stage of exploration,the sedimentary background,palaeogeographical location and shale oil exploration potential of the Fengcheng Formation of the Hashan area are still unclear. Based on the exploration and development practice of shale oil in the Hasan area during the past decade,the sedimentary environment,shale facies,source rock quality,oil content and reservoir quality of the Fengcheng Formation shale oil in this area were studied systematically. The results show that besides the main sag in the Mahu sag,there was another alkaline lake center of developed in the central part of the Hashan area,which is another hydrocarbon rich depression for the Fengcheng Formation. The volcanic eruption,sedimentary evolution and alkaline salts forming stage of the Hashan area bear a strong resemblance to that of the Wuxia area to the south. A four end-member classification scheme is proposed here for the alkaline lake shale in the Fengcheng Formation. The shale of the Fengcheng Formation can be divided into eight lithofacies,including four salty lithofacies and four non-salty lithofacies. On the whole,the clayey shale and calcareous shale of the Fengcheng Formation in the Hashan area have the highest organic matter abundance,the dolomitic shale and salty shale have relatively good oil content,and the dolomitic shale and siltstone have the best reservoir property. It is proposed that the dolomitic shale comprises the class-I sweet spot and the siltstone comprises the class-II sweet spot for shale exploration. For the Fengcheng Formation,shale in the Hashan area is similar to that of in the Wuxia area in terms of source rock and reservoir quality,both of which have high shale oil exploration potential.
LIU Huimin,WEN Huaguo,ZHANG Kuihua et al. Geological characteristics and exploration prospects of alkaline lake shale oil of the Fengcheng Formation, Hashan area,NW Junggar Basin[J]. JOPC, 2024, 26(5): 1017-1036.
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