Typical strike-slip fault zones in southeastern Sichuan: Fault characteristics and potential for fault-controlled fractured vuggy reservoirs

doi:10.13745/j.esf.sf.2024.6.32

Abstract

Abstract:

Controlled by the physical fracturing of medium and small-scale basement strike-slip fault zones fault-controlled fractured vuggy reservoirs are developed in Shunbei, Tarim Basin, where exploration breakthroughs have been made in recent years. Recent research has found that the NW-trending basement fractures in the southeastern Sichuan Basin also have typical strike-slip characteristics, while further analysis is needed to determine whether the area has undergone similar reservior development. Based on 3D seismic data, we start with the geometric and kinematic characteristics of strike-slip faults, and analyze and compare the deformation characteristics of typical strike-slip fault zones between Shunbei and the Fuling/Qijiang areas, southeastern Sichuan. Meanwhile, based on the analyses of fault movement direction, fault activity, and structural background, the formation and evolutionary history of basement faults in the study area is restored and compared with that of Shunbei. Finally, based on the proven seismic reflection characteristics of Shubei reservoirs, we sort out the seismic anomalies near typical strike-slip fault zones in the study area, and comprehensively analyze the area’s potential for reservoir development. The analyses suggest that the geometric and kinematic characteristics of the NW-trending basement strike-slip fault zone in the study area are similar to those in Shunbei that has undergone multi-periods of parallel strike-slip activities, while Fuling has experienced three periods of fault activities of different types. In addition, the seismic reflection characteristics corresponding to typical reservoirs in northern Shunbei can also be identified in the study area. It is generally believed that typical strike-slip fault zones in Fuling have great potential for the development of fracture-controlled fracture-cave reservoirs, and Qijiang also has certain development potentials.

Key words: southeastern Sichuan, strike-slip fault, geometric characteristics, kinetic characteristic, fault-controlled fractured vuggy reservoirs

CLC Number:

SHI Siyu, LI Bisong, LI Rangbin, ZOU Yutao. Typical strike-slip fault zones in southeastern Sichuan: Fault characteristics and potential for fault-controlled fractured vuggy reservoirs[J]. Earth Science Frontiers, 2024, 31(5): 288-300.

Figures/Tables 13

Fig.1 Distribution map of main strike-slip faults in northern Tarim Basin (left panel) and Sichuan Basin (right)

Fig.2 Distribution map of strike-slip faults in Fuling (a) and Qijiang (b) areas, southeastern Sichuan

Fig.3 Coherent attribute slices, segmentation characteristics, and typical seismic profiles of the No.15 strike-slip fault zone in Fuling

Fig.4 Coherent attribute slices, segmentation characteristics, and typical seismic profiles of the NW strike-slip fault zone in central Zhongliangshan-Simianshandong areas of Qijiang

Fig.5 Statistical diagram of vertical fault displacement of various stratigraphic interfaces along the No.15 fault zone

Fig.6 Statistics of vertical fault displacement of each stratum interface in the NW-trending strike-slip fault zone in Zhongliangshan-Simianshandong area

Fig.7 Slip displacement of the north (a), middle (b) and south (c) sections of the Piqiang strike-slip fault zone, northern Tarim Basin

Fig.8 Current slip displacement and strike-slip direction of the TS interface

Fig.9 Current slip displacement and strike-slip direction of TS interface in Zhongliangshan-Simianshandong area

Fig.10 Multiphase evolution model of strike-slip faults in the Sichuan Basin

Table 1 Comparison of geometric and kinematic parameters and evolution processes of strike-slip faults in the Shunbei, Fuling, and Qijiang regions

地区	几何学参数		运动学参数		主要演化过程
地区	叠接段平均长度/km	叠接段平均宽度/km	隆/凹幅度/ ms	滑移距/ km	主要演化过程
顺北地区 (NE向)	2.87( $T 7 4$ )	0.81( $T 7 4$ )	10~60 ( $T 7 4$ )	0.3~1.38 ( $T 7 4$ )	① 加里东中期左行走滑 ② 加里东晚期左行走滑 ③ 海西中—晚期左行走滑
涪陵地区 (15号带)	2.47(TP₂)	1.39(TP₂)	5~35 (TP₂)	0.6~1.3 (TS)	① 加里东早期较弱右行走滑 ② 海西晚期继承性拉张 ③ 晚燕山—早喜马拉雅期左行走滑
綦江地区 (中梁山-四面山东NW向)	4.18(TS)	1.03(TS)	10~35 (TS)	0.4~0.9 (TS)	① 早喜马拉雅期右行走滑 (是否为加里东晚期形成待研究)

Table 1 Comparison of geometric and kinematic parameters and evolution processes of strike-slip faults in the Shunbei, Fuling, and Qijiang regions

地区	几何学参数		运动学参数		主要演化过程
地区	叠接段平均长度/km	叠接段平均宽度/km	隆/凹幅度/ ms	滑移距/ km	主要演化过程
顺北地区 (NE向)	2.87( $T 7 4$ )	0.81( $T 7 4$ )	10~60 ( $T 7 4$ )	0.3~1.38 ( $T 7 4$ )	① 加里东中期左行走滑 ② 加里东晚期左行走滑 ③ 海西中—晚期左行走滑
涪陵地区 (15号带)	2.47(TP₂)	1.39(TP₂)	5~35 (TP₂)	0.6~1.3 (TS)	① 加里东早期较弱右行走滑 ② 海西晚期继承性拉张 ③ 晚燕山—早喜马拉雅期左行走滑
綦江地区 (中梁山-四面山东NW向)	4.18(TS)	1.03(TS)	10~35 (TS)	0.4~0.9 (TS)	① 早喜马拉雅期右行走滑 (是否为加里东晚期形成待研究)

Fig.11 Seismic response characteristics of Lower Permian fault-controlled fracture-cave reservoirs in the No.15 strike-slip fault zone

Fig.12 Seismic response characteristics of Silurian-Ordovician fracture-controlled fracture-cave reservoirs in the NW strike-slip fault zone in Zhongliangshan-Simianshandong area

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