Seismic Description of Deep Strike-Slip Fault Damage Zone by Steerable Pyramid Method in the Sichuan Basin, China

Qingsong Tang, Shuhang Tang (), Bing Luo, Xin Luo, Liang Feng, Siyao Li and Guanghui Wu ()
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Qingsong Tang: PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China
Shuhang Tang: School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
Bing Luo: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China
Xin Luo: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China
Liang Feng: Chongqing Division, PetroChina Southwest Oil & Gasfield Company, Chongqing 400707, China
Siyao Li: School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
Guanghui Wu: School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

Energies, 2022, vol. 15, issue 21, 1-13

Abstract: Large quantities of gas resources have been found in the Paleo-Mesozoic carbonate rocks in the Sichuan Basin. However, many wells cannot obtain high production in deep low porosity-permeability reservoirs. For this contribution, we provide a steerable pyramid method for identifying the fault damage zone in the Kaijiang–Liangping platform margin, which is infeasible by conventional seismic methods. The results show that steerable pyramid processing could enhance the seismic fault imaging and a series of NW-trending strike-slip faults are found along the trend of the carbonate platform margin. The steerable pyramid attribute presents distinct vertical and horizontal boundaries of the fault damage zone, and heterogeneous intensity of an un-through-going damage zone. The width of the fault damage zone is generally varied in the range of 100–500 m, and could be increased to more than 1000 m in the fault overlap zone, intersection area, and fault tips. Further, the fault damage zone plays a constructive role in the high gas production in the deep tight carbonate reservoir. The results suggest the steerable pyramid method is favorable for identifying the weak strike-slip faults and their damage zone. The width of the fault damage zone is closely related to fault displacement, and the much wider damage zone is generally influenced by the fault overlapping and interaction. The fractured reservoirs in the fault damage zone could be a new favorable exploitation domain in the Sichuan Basin.

Keywords: steerable pyramid processing; strike-slip fault; fault damage zone; fractured reservoir; carbonate exploitation; Sichuan Basin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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