Geometry, kinematic characteristics and evolution of No.15 strike-slip fault zone in Fuling area, eastern Sichuan

doi:10.13745/j.esf.sf.2023.2.18

Abstract

Abstract:

There are many NW-trending hidden strike-slip faults in the central and northern Sichuan Basin, and their control on the carbonate reservoirs is revealed by the recent oil and gas explorations. In order to better understand the geometry, kinematic characteristics and evolution of such faults, the No. 15 strike-slip fault in Fuling area, eastern Sichuan is investigated to determine the deformation characteristics and fault structure styles of different structural layers using the latest processed 3D seismic data. Based on the temporospatial variation patterns of stratum thicknesses on both sides of the strike-slip fault, the mechanism of strike slip faulting is analyzed, and the strike slip displacement is determined. Finally, the evolution of the hidden strike-slip fault zone is described in combination with the tectonic deformation events. The structural layer of No. 15 strike-slip fault below the Cambrian salt is mainly a single vertical fault with linear distribution on the plane, showing weak compressive torsional strength in the middle-Lower Cambrian to Ordovician with the development of branch faults at the top and a narrow pressure uplift section. The branch faults are most developed in the structural layer below the Silurian to Lower Triassic salt, with positive and negative flower-like structural styles with echelon distribution on the plane. According to kinematic analysis, the strike-slip fault experienced three main evolutionary stages: right strike slip in the middle-late Caledonian, synsedimentary activity in the late Hercynian, and left strike slip in the late Yanshan-early Himalayan periods. The research results provide a basis for in-depth studies of the strike-slip faults in Fuling area, and a reference for the study of reservoir control models and oil and gas accumulation in strike-slip faults in general.

Key words: Fuling area, strike-slip fault, delamination deformation, kinetic characteristics, tectonic evolution

CLC Number:

DUAN Jinbao, PAN Lei, SHI Siyu, JIANG Zhenxue, LI Pingping, ZOU Yutao, ZHANG Wenrui. Geometry, kinematic characteristics and evolution of No.15 strike-slip fault zone in Fuling area, eastern Sichuan[J]. Earth Science Frontiers, 2023, 30(6): 57-68.

Figures/Tables 11

Fig.1 Distribution map of Silurian bottom boundary faults in Fuling area, East Sichuan (a), structural unit division map of Sichuan Basin (b) and coherence attribute of Silurian bottom of No.15 strike-slip fault (c)

Fig.2 Division of stratigraphic structural layers in Fuling area, eastern Sichuan Basin

Fig.3 Vertical structure sequence and layered deformation characteristics of No.15 strike-slip fault

Fig.4 Coherence attribute and fault distribution map of different stratigraphic interfaces of No.15 strike-slip fault in Fuling area

Fig.5 Statistical diagram of vertical fault distance of different layers of No.15 strike-slip fault in Fuling area

Fig.6 Typical seismic profile of strata thickness variation characteristics on both sides of No.15 strike-slip fault in Fuling area

Fig.7 Schematic diagram of thickness variation of strata on both sides of No.15 strike-slip fault in Fuling area

Fig.8 The time slices near different stratigraphic interfaces of No.15 strike-slip fault in Fuling area

Fig.9 Statistical diagram of strike slip distance of different stratum interfaces of No.15 strike-slip fault in Fuling area

Fig.10 Schematic diagram of seismic facies change on both sides of hidden strike-slip fault in Fuling area

Fig.11 Evolution model of No.15 strike-slip fault in Fuling area

References 24

[1]	王斌, 赵永强, 何生. 塔里木盆地顺北5号断裂带北段奥陶系油气成藏期次及其控制因素[J]. 石油与天然气地质, 2020, 41(5): 965-974.
[2]	周铂文. 塔里木盆地顺北地区下古生界走滑断裂带内部构型及其控储作用[D]. 武汉: 中国地质大学(武汉), 2021.
[3]	张继标, 张仲培, 汪必峰, 等. 塔里木盆地顺南地区走滑断裂派生裂缝发育规律及预测[J]. 石油与天然气地质, 2018, 39(5): 955-963, 1055.
[4]	韩剑发, 苏洲, 陈利新, 等. 塔里木盆地台盆区走滑断裂控储控藏作用及勘探潜力[J]. 石油学报, 2019, 40(11): 1296-1310. DOI
[5]	韩俊, 曹自成, 邱华标, 等. 塔中北斜坡奥陶系走滑断裂带与岩溶储集体发育模式[J]. 新疆石油地质, 2016, 37(2): 145-151.
[6]	杨光, 汪华, 沈浩, 等. 四川盆地中二叠统储层特征与勘探方向[J]. 天然气工业, 2015, 35(7): 10-16.
[7]	张健, 周刚, 张光荣, 等. 四川盆地中二叠统天然气地质特征与勘探方向[J]. 天然气工业, 2018, 38(1): 10-20.
[8]	汪华, 沈浩, 黄东, 等. 四川盆地中二叠统热水白云岩成因及其分布[J]. 天然气工业, 2014, 34(9): 25-32.
[9]	刘建强, 郑浩夫, 刘波, 等. 川中地区中二叠统茅口组白云岩特征及成因机理[J]. 石油学报, 2017, 38(4): 386-398. DOI
[10]	潘磊, 徐祖新, 李让彬, 等. 川东南涪陵地区走滑断裂带特征与油气成藏[J]. 特种油气藏, 2020, 27(4): 19-25. DOI
[11]	王新岚, 梁虹, 朱亚东, 等. 川中-川南走滑断裂带展布特征及与油气成藏关系[C]// 《石油地球物理勘探》编辑部. 中国石油学会2021年物探技术研讨会论文集. 北京: 中国石油学会, 2021: 964-967.
[12]	杨平, 丁博钊, 范畅, 等. 四川盆地中部高石梯地区柱状下拉异常体分布特征及成因[J]. 石油勘探与开发, 2017, 44(3): 370-379. DOI
[13]	杨柳, 赵容容, 梁虹, 等. 川西南部二叠系火山岩相地震预测及分布主控因素[J]. 成都理工大学学报(自然科学版), 2022, 49(1): 94-103.
[14]	焦方正, 杨雨, 冉崎, 等. 四川盆地中部地区走滑断层的分布与天然气勘探[J]. 天然气工业, 2021, 41(8): 92-101.
[15]	邹玉涛, 张文睿. 川东南LZ地区走滑断裂特征与油气成藏作用[J]. 中国石油和化工标准与质量, 2021, 41(16): 128-129.
[16]	樊春, 王二七, 王刚, 等. 龙门山断裂带北段晚新近纪以来的右行走滑运动及其构造变换研究: 以青川断裂为例[J]. 地质科学, 2008, 43(3): 417-433.
[17]	管树巍, 梁瀚, 姜华, 等. 四川盆地中部主干走滑断裂带及伴生构造特征与演化[J]. 地学前缘, 2022, 29(6): 252-264. DOI
[18]	汪泽成, 赵文智, 李宗银, 等. 基底断裂在四川盆地须家河组天然气成藏中的作用[J]. 石油勘探与开发, 2008, 35(5): 541-547.
[19]	邓尚, 李慧莉, 韩俊, 等. 塔里木盆地顺北5号走滑断裂中段活动特征及其地质意义[J]. 石油与天然气地质, 2019, 40(5): 990-998, 1073.
[20]	况安鹏, 余一欣, 朱秀香, 等. 塔里木盆地顺北地区11号走滑断裂带变形及其活动特征[J]. 现代地质, 2021, 35(6): 1809-1817.
[21]	林波, 张旭, 况安鹏, 等. 塔里木盆地走滑断裂构造变形特征及油气意义: 以顺北地区1号和5号断裂为例[J]. 石油学报, 2021, 42(7): 906-923. DOI
[22]	云露, 邓尚. 塔里木盆地深层走滑断裂差异变形与控储控藏特征: 以顺北油气田为例[J]. 石油学报, 2022, 43(6): 770-787. DOI
[23]	杨晓利, 张自力, 孙明, 等. 同沉积断层控砂模式: 以南堡凹陷南部地区Es¹段为例[J]. 石油与天然气地质, 2014, 35(4): 526-533.
[24]	李震. 同沉积构造发育特征及其油气地质意义[J]. 断块油气田, 2008, 15(4): 1-4.