准噶尔盆地西北缘哈山地区二叠系风城组页岩油储层特征及其控制因素

doi:10.12108/yxyqc.20230103

Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 25-35.doi: 10.12108/yxyqc.20230103

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Shale oil reservoir characteristics and controlling factors of Permian Fengcheng Formation in Hashan area,northwestern margin of Junggar Basin

ZENG Zhiping¹, LIU Zhongquan¹, ZHAO Leqiang¹, LI Yanli¹, WANG Chao¹, GAO Ping²

1. Sinopec Shengli Oilfield Company, Dongying 257015, Shandong, China;
2. School of Energy Resources, China University of Geosciences (Beijing)， Beijing 100083, China

Received:2022-06-01 Revised:2022-06-20 Online:2023-01-01 Published:2023-01-06

Abstract

Abstract: The Permian Fengcheng Formation in the northwestern margin of Junggar Basin is enriched with shale oil resources，and a major breakthrough has been made in oil and gas exploration in Mahu Sag and Wuxia area. There is certain exploration potential in the adjacent Hasan area. Through rock thin section observation，scanning electron microscope analysis，organic geochemical test，XRD analysis and reservoir physical property analysis， the shale oil reservoir characteristics and controlling factors of Permian Fengcheng Formation in Hashan area were studied. The results show that: (1) The lithologies of shale oil reservoirs of Permian Fengcheng Formation in Hashan area are mainly composed of felsic shale，calcareous shale and mixed shale. The shale could be classified as good to best source rocks. The organic matters are mainly typeⅡ₁ and typeⅡ₂，and mainly at the immature stage. Some shale samples in the footwall of the overthrusts were involved into early mature stage. (2) The average porosity of the shale oil reservoirs in the study area is 2.32%，belonging to low porosity reservoir. The reservoir space is dominated by inorganic pores and micro-fractures，and the development degree of organic pores is relatively low. (3) The development of shale oil reservoirs of Fengcheng Formation in the study area is mainly controlled by sedimentary facies，diagenesis and tectonic activities. Sedimentary facies not only determines the rock type，but also controls the enrichment of organic matters. Compaction and cementation can play a negative role in reservoir physical properties，and dissolution can greatly improve reservoir physical properties. Micro-fractures formed by tectonic activities can not only provide reservoir spaces for shale oil，but also provide channels for oil and gas migration，thus improving the percolation condition of shale oil reservoirs.

Key words: mixed rocks, pore type, dissolution, diagenesis, Fengcheng Formation, Permian, Hashan area, northwestern margin of Junggar Basin

CLC Number:

TE112.23

ZENG Zhiping, LIU Zhongquan, ZHAO Leqiang, LI Yanli, WANG Chao, GAO Ping. Shale oil reservoir characteristics and controlling factors of Permian Fengcheng Formation in Hashan area,northwestern margin of Junggar Basin[J].Lithologic Reservoirs, 2023, 35(1): 25-35.

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