Prediction of Structural Fractures in Deng 4 Member Reservoirs in the Shehong-Yanting Block, Penglai Gas Field, Sichuan Basin

doi:10.7657/XJPG20250202

Abstract

Abstract:

In order to determine the distribution of the fractures in the fourth member of the Dengying formation (Deng 4 member) in the Shehong-Yanting block of the Penglai gas field, Sichuan Basin, a statistical analysis was conducted on the structural fracture parameters. Based on rock rupture criteria, occurrence evolution conditions, and present-day stress field characteristics, a quantitative prediction of fractures in the ultra-deep carbonate reservoirs of the Deng 4 member were performed through tectonic stress field inversion. The results show that structural shear fractures are well developed in the Deng 4 member, oblique fractures are concentrated in the southeastern structural highs, while high-angle and vertical fractures are mostly distributed near faults. The fracture strikes are predominantly NW-SE, NE-SW and NNW-SSE. The linear density of fracture is generally low in the southeast and high in the northwest, while the fracture aperture shows an opposite distribution pattern. The fracture porosity reflects a relatively small variation. Fracture parameters exhibit different distribution characteristics within fault zones, near faults, and in non-fault areas, with the predicted results being largely consistent with the measured data. The fracture dip, aperture, and porosity significantly influence gas well productivity.

Key words: Sichuan Basin, Penglai gas field, Shehong, Yanting, Dengying formation, Deng 4 member, mechanical model, structural fracture

CLC Number:

TE122.1

LI Gao, SHANGGUAN Ziran, YANG Xu, LI Hongtao, LI Ze, WANG Qiutong. Prediction of Structural Fractures in Deng 4 Member Reservoirs in the Shehong-Yanting Block, Penglai Gas Field, Sichuan Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 136-143.

Figures/Tables 9

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地质力学单元	密度/ （g·cm^-3）	弹性模量/ GPa	泊松比	内聚力/ MPa	内摩擦角/ （°）
上覆地层	2.72	38	0.225	22	35
筇竹寺组	2.65	30	0.235	15	30
灯四段	2.78	55	0.230	38	40
基底	2.78	55	0.230	40	36
断层	2.58	33	0.250	28	30

井名	裂缝线密度/（条·m^-1）		裂缝开度/μm		裂缝孔隙度/%
井名	预测	实测	预测	实测	预测	实测
DB1井	0.81	0.89	9.93	14.56	0.002 1	0.001 8
PS15井	0.73	0.80	8.00	11.78	0.001 6	0.001 4
PS13井	0.86	0.81	6.95	8.89	0.002 2	0.001 9
PS6井	1.17	1.03	2.53	3.72	0.001 8	0.001 5