Formation and evolution of strike-slip fault zones in the eastern Sichuan Basin and identification and characterization of the fault zones: A case study of the Fuling area

被引：0
|
作者：
Zeng T. [1 ]
Fan R. [1 ]
Xia W. [1 ]
Zou Y. [1 ]
Shi S. [1 ]
机构：
[1] Sinopec Exploration Company, Chengdu
来源：
Earth Science Frontiers | 2023年 / 30卷 / 03期
关键词：
Eastern Sichuan Basin; evolution mode; formation; geometric features; kinematic characteristics; strike-slip faults;
D O I：
10.13745/j.esf.sf.2022.12.58
中图分类号：
学科分类号：
摘要：
Basement strike-slip fault zones of petroliferous basins are newly recognized high-yield hydrocarbon enrichment zones with broad prospects for oil/gas exploration and development. Increasingly more attention has been paid to the identification and geometrical/kinematical characterization of basement strike-slip faults as well as the role of “reservoir/pool controls” in this type of fault systems. This paper reports the new discovery of large-scale NW and NE-trending basement strike-slip fault zones in Fuling area, eastern Sichuan Basin, and establishes the identification criteria for strike-slip faults in this area based on characteristic fault patterns. The characteristic fault patterns include vertical faults and flower-like structures on the profile; planar linear extension of fault with staggered geological boundaries; and obvious segmentation of master faults in “ribbon-like” or “dolphin-like” strike-slip fault patterns and with changing mechanical properties. A new method is proposed for determining the strike-slip directions based on seismic analysis to measure the change of vertical displacements and the difference in tectonic-activity intensities between the two sides of the fault. It is found that the NW-trending basement strike-slip fault zone generally presents left-lateral slip but with variable strike-slip deformations in different evolutionary stages. Since its formation, the NW-trending faults zone has experienced at least 5 left-lateral and 3 right-lateral slip events which can be characterized by left-lateral slip in the deep crust, right-lateral slip in the shallow crust, high activity-intensity in the north and low activity-intensity in the south, with a cumulative left-lateral strike-slip offset reaching up to 1400 3400 m. In comparison, the NE-trending basement strike-slip fault zone is characterized by right-lateral strike-slip, and the cumulative strike-slip offset is about 1930 m. It suggests that there are significant differences in the formation and evolution of the two fault zones controlled mainly by regional tectonic movements, evolution of stress field environment in different evolutionary stages as well as stress release of regional detachment layers where the NW-trending strike-slip fault zone is affected by Lower-Triassic gypsum-salt detachment layer and the NE-trending strike-slip zone is affected by Middle-Lower-Silurian shale detachment layer. © 2023 Science Frontiers editorial department. All rights reserved.
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页码：366 / 385
页数：19
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