Reservoir characteristics and key technologies for shale gas exploration and development of the first member of the Permian Shanxi Formation in Yan’an area

doi:10.3969/j.issn.1672-7703.2022.03.010

Abstract

Abstract: There are abundant shale gas resources in the first member of the Permian Shanxi Formation (Shan 1 member) in Yan’an area. However, the shale reservoir has strong heterogeneity and the geological conditions for gas accumulation are complex. There are abundant shale gas resources in the first member of the Permian Shanxi Formation (Shan 1 member) in Yan’an area. However, the shale reservoir has strong heterogeneity and the geological conditions for gas accumulation are complex. Based on the geological and engineering characteristics of shale gas in Shan 1 member, systematic study and technology research are conducted by using drilling, logging, fracturing, core experiment and well testing data, so as to identify the exploration potential of shale gas in the study area. In addition, key technologies for the exploration and development of continental shale gas are developed. The results show that the interbedding of sand and shale is developed in Shan 1 member with rapid lithofacies changes laterally. The shale is generally gas-bearing, as well as the adjacent sandstone, which is characterized by the mixture of sand and shale and compound gas accumulation. The cumulative shale thickness of Shan 1 member is 25m on average, and the formation pressure coefficient is 0.82. The organic matter is dominated by Type III kerogen, with R_o of between 2.33%-2.85%. Four types of pores and two types of fractures are developed in shale, and the average content of desorption gas is 1.2m³/t. The average gas saturation of the adjacent sandstone is 45%, and the average porosity is 7.2%. The integrated and innovative researches enable to initially develop a series of key technologies, such as “three qualities” logging evaluation of continental shale gas, shale gas reservoir recognition and geosteering while drilling, optimal and fast drilling of horizontal well with low cost, and CO₂ mixed volume fracturing of horizontal well, which strongly support shale gas exploration and development in Yan’an area. Three horizontal wells have been drilled, with drilling time decrease of 11.3%, average thin sandstones penetration rate of more than 75%, and an open flow rate of more than 6×10⁴m³/d.

CLC Number:

TE112.23

Sun Jianbo, Hao Shiyan, Zhao Qianping, Luo Tengyue, Jiang Lei, Gao Chao, Guo Chao, Yin Jintao, Liu Gang, Xu Jie. Reservoir characteristics and key technologies for shale gas exploration and development of the first member of the Permian Shanxi Formation in Yan’an area[J]. China Petroleum Exploration, 2022, 27(3): 110-120.

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