Aquifer site selection for natural gas storage and key indices evaluation method: a case study of Baiju aquifer in Subei Basin

doi:10.3969/j.issn.1672-7703.2021.05.013

Abstract

Abstract: The construction of gas storage is now the only practical solution in economically developed areas of central and eastern China since the natural gas pipeline and LNG can no longer satisfy the peak demand modulation and supply guarantee. In addition, another two types of targets, depleted gas reservoir and salt cavern in central and eastern China are not suffi cient to construct gas storage. The aquifer target has complex structure and low level of exploration, which is challenging to select favorable site and carry out preliminary evaluation. By analyzing the aquifer conditions for gas storage construction at home and abroad and the characteristics of aquifer target in China, such as great burial depth, complex structure and poor physical properties, evaluation criteria and methods for aquifer sites selection are put forward. As a result, Baiju aquifer structure with relatively good conditions for gas storage construction is selected as the study object in the central and eastern China. The results show that: (1) The maximum fl ow pressure that the aquifer can withstand is 15.0 MPa and the enhanced pressure factor is 1.2; (2) The effective space volume of gas storage is 3864×10⁴m³, gas saturation is 64.7% and total gas storage capacity is 17.5×10⁸m³; (3) There are many uncertain factors in the plugging treatment of the two open hole wells at the top of the aquifer structure, and the risk of gas storage construction is high. It is suggested that the subsalt aquifer with shallow burial depth, good physical properties and large-scale water body in the central and eastern China should be selected for gas storage target.

CLC Number:

TE722

Qiu Xiaosong, Zheng Yali, Ye Ying, Lai Xin, Liu Mancang, Xu Shujuan, Yao Qiuchang, Huangfu Xiaohong. Aquifer site selection for natural gas storage and key indices evaluation method: a case study of Baiju aquifer in Subei Basin[J]. China Petroleum Exploration, 2021, 26(5): 140-148.

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