文献类型：期刊文献

中文题名：先存构造对川东北部侏罗山式褶皱运动学的影响及油气地质意义

英文题名：Influence of Pre-existing Structures on the Kinematics of Jura-type Folds in Northeastern Sichuan and Its Implications for Hydrocarbon Exploration

作者：陈友智 臧殿光 陈颖 夏铭 郭海洋 陈娜 王兰英 于宁

第一作者：陈友智

机构：[1]中国石油集团东方地球物理勘探有限责任公司西南物探研究院,四川成都610213;[2]中国石油集团西南油气田公司开发事业部,四川成都610000;[3]贵州理工学院资源与环境工程学院,贵州贵阳550003

第一机构：中国石油集团东方地球物理勘探有限责任公司西南物探研究院,四川成都610213

年份：2025

卷号：49

期号：6

起止页码：1286-1295

中文期刊名：大地构造与成矿学

外文期刊名：Geotectonica et Metallogenia

收录：;北大核心:【北大核心2023】；

基金：中国石油东方地球物理勘探有限责任公司科研项目(12-02-13-2024);贵州省科技计划项目(黔科合JZ字[2015] 2005)联合资助。

语种：中文

中文关键词：川东北部;侏罗山式褶皱;先存构造;运动学;灯影组;须家河组

外文关键词：northeastern Sichuan;Jura-type folds;pre-existing structures;kinematics;Dengying Formation;Xujiahe Formation

摘要：川东北部侏罗山式褶皱带是重要的油气聚集区,前人对其运动学进行研究时未考虑基底先存构造的影响,常将基底设置为向东缓倾斜坡,褶皱带逐渐向西扩展。本次研究综合川东北部地震反射资料、钻井资料、野外露头以及区域地质研究成果,讨论先存构造对沉积地层分布、褶皱带运动过程以及油气成藏的影响。研究获得如下认识:(1)川东北部新元古代灯影期裂陷边界断层,在早古生代继承性发育,控制寒武系-奥陶系塑性岩层分布;先存构造位于相变区,岩石力学性质的差异利于后期构造形成。(2)川东北部新元古代裂陷边界断层附近在中-新生代构造变形强,背斜隆升早,不同段褶皱带的扩展方式受先存断裂控制的基底楔角和地层力学性质共同影响。(3)川东北部先存构造控制灯影组-寒武系台缘带/台内滩储层的分布,华蓥山、南门场-云安场、方斗山-齐岳山灯影期裂陷边界断层附近可能存在灯影组台内滩,先存构造也可沟通南华系和志留系烃源岩,形成构造-岩性圈闭。(4)先存构造附近背斜处,须家河组砂岩致密化前、后各有一期油气充注;先存构造之间隆升稍晚的低幅度背斜,油气聚集时间可能早于砂岩致密化,是有利的勘探区;远离先存构造的区域,背斜形成晚,油气聚集时间晚于砂岩致密化,气藏主要受控于断层-裂缝。研究认为四川盆地东北部先存构造影响塑性滑脱层的分布、褶皱运动学、灯影组储集层分布与成藏模式、须家河组油气充注期次与构造控储形式,对川东北部油气勘探具有重要参考价值。
The Jura-type fold belt in northeastern Sichuan is an important hydrocarbon accumulation area.Previous kinematic studies have largely overlooked the influence of pre-existing basement structures,often assuming the basement to be a gentle east-dipping slope with westward propagation of the fold belt.Based on seismic reflection profiles,drilling data,field outcrop observations,and regional geological studies in the northeastern Sichuan Basin,this study investigates the influence of these pre-existing structures on the distribution of sedimentary strata,the propagation of the fold belt,and hydrocarbon accumulation.The following conclusions are obtained:(1)Neoproterozoic Dengying stage rift boundary faults in northeastern Sichuan were inherited and reactivated in the Early Paleozoic,controlling the distribution of Cambrian-Ordovician ductile layers.These pre-existing structures,located within the facies transition zone,facilitated the development of subsequent structures.(2)Intense Meso-Cenozoic tectonic deformation occurred near the Neoproterozoic rift boundary,characterized by early-stage anticlinal uplift.The propagation styles of the fold belt segments were influenced by the geometry of basement wedges,which were controlled by pre-existing faults,and the mechanical properties of the strata.(3)The pre-existing structures in northeastern Sichuan controlled the distribution of reservoirs in the Dengying Formation and the Cambrian platform margin and intra-platform shoals.Furthermore,they likely served as conduits,linking the Nanhua and Silurian source rocks to form structural-lithological traps near the Dengying-era boundary faults in the Huaying Mountain,Nanmenchang-Yunanchang,and Fangdoushan-Qiyueshan areas.(4)For anticlines near the pre-existing structures,hydrocarbon charging occurred both before and after the densification of the Xujiahe Formation sandstones.Low-amplitude anticlines with late uplift between pre-existing structures may be favorable exploration targets for pre-densification hydrocarbon accumulation.In contrast,anticlines located farther from pre-existing structures formed later,with hydrocarbon accumulation post-dating sandstone densification,resulting in gas reservoirs primarily controlled by faults and fractures.In conclusion,pre-existing structures in the eastern Sichuan Basin exerted a significant control on the distribution and folding kinematics of the Dengying Formation,and the timing and structural control of hydrocarbon charging in the Xujiahe Formation.These findings provide important insights for oil and gas exploration in northeastern Sichuan.