Evaluation Method of Fracture Complexity of Fracture Network Fracturing for Tight Sandstone Fractured Gas Reservoir

doi:10.3969/j.issn.1006-6535.2022.02.023

Abstract

Abstract: Microseism is an effective method and means to evaluate the fracture morphology and geometry formed by fracture network fracturing in fractured tight sandstone oil and gas reservoirs, but constrained by its applicability conditions and high cost. Therefore, a rapid, economical and applicable method is needed to evaluate the fracture complexity in fracture network fracturing. Based on the pressure drop data after fracture pump shutdown, the reservoir seepage model was analyzed by seepage equation which was established for tight sandstone fractured reservoirs with apparent homogeneity, linear fracture and complex fracture, and the reservoir fracture morphology was analyzed with G function, so as to comprehensively evaluate the fracture complexity in the network fracturing and develop a method to quickly evaluate the fracture complexity of the network fracturing. The microseismic test results proved that this method was reliable. The study results can technically provide support for the network fracturing effect evaluation and productivity prediction of tight sandstone fractured gas reservoirs.

Key words: tight sandstone, fractured gas reservoir, fracture network fracturing, fracture network complexity, pump-off pressure drop data, G function

CLC Number:

TE357.2

Xiao Yang, Liu Shouyu, He Yongzhi, Li Zhigang, Wang Jiahao, Yang Jinyuan, Ma Zhonghui. Evaluation Method of Fracture Complexity of Fracture Network Fracturing for Tight Sandstone Fractured Gas Reservoir[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 157-163.

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