Comprehensive Evaluation Method for Vertical Sealing of Fault and Its Application

Abstract

Abstract: Based on the in-depth study of vertical sealing mechanism of fault and its influencing factors and using Darcy’s law, this paper established a comprehensive evaluation index v_D by calculating percolation velocity of oil and gas at target zones through fault under the given action of external stress, and applied it in evaluation of vertical sealing properties of W1 and W5 faults in Wangjiatun gas field of northern Songliao basin as well as No.1 to No.7 faults (Qingshankou formation) in Nanshanwan- Dalai area, obtaining v_D of W1 and W5 is 7.0% and 8.6%, respectively, showing good vertical sealing capacity; No.1 to No.5 faults in Nanshanwan-Dalai area are of good vertical sealing property; while No.6 and No.7 faults are of medium one. It is indi-cated that this method can be used for quantitative tvaluation of verlical sealing feature of faults as an effective evaliating tool.

Key words: Songliao basin, Wangjiatun gas field, fault, sealing property, comprehensive evaluation

CLC Number:

TE111.2

FU Guang, LY Yan-fang, MA Fu-jian, FU Xiao-fei. Comprehensive Evaluation Method for Vertical Sealing of Fault and Its Application[J]. Xinjiang Petroleum Geology, 2003, 24(5): 451-454.

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