四川盆地加里东期构造运动特征及其地质响应  

Characteristics and geological response of Caledonian tectonic movement in the Sichuan Basin

作　　者：谷明峰 刘冉[2] 张豪 和源 李堃宇 郝毅 姜华[3] 李文正 GU Mingfeng;LIU Ran;ZHANG Hao;HE Yuan;LI Kunyu;HAO Yi;JIANG Hua;LI Wenzheng(PetroChina Hangzhou Research Institute of Geology,PetroChina,Hangzhou,Zhejiang 310023,China;Exploration and Development Research Institute of PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610041,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]中国石油杭州地质研究院,310023 [2]中国石油西南油气田公司勘探开发研究院 [3]中国石油勘探开发研究院 [4]成都理工大学

出　　处：《天然气工业》2023年第2期32-43,共12页Natural Gas Industry

基　　金：中国石油天然气集团有限公司上游领域基础性前瞻性项目“残留型海相盆地构造—岩相古地理重建技术研究”(编号:2021DJ0501);中国石油天然气股份有限公司科学研究与技术开发项目“四川盆地震旦—寒武系重大勘探领域岩相古地理与有利储层分布研究”(编号:kt2020-01-02)、“碳酸盐岩油气藏高产控制因素研究”(编号:2021DJ1503)。

摘　　要：加里东运动是四川盆地重要的构造变形期,期间形成的乐山—龙女寺古隆起对震旦系、下古生界油气成藏具有重要的控制作用。但是,四川盆地内加里东运动的研究重点长期集中在志留纪—泥盆纪的构造旋回,对寒武纪—奥陶纪期间加里东运动的研究程度较低。为此,利用新采集及重新处理的区域地震资料,结合钻井、野外露头数据,通过区域地震对比解释,重新落实了早古生界的地层分布,研究了加里东多期构造运动的活动特征与地质响应,明确了加里东运动对古沉积、古构造控制下的天然气成藏有利区。研究结果表明:(1)加里东构造旋回,四川盆地受到了郁南运动、都匀运动和广西运动等3期构造运动的重要影响,持续的构造活动控制了四川盆地西部加里东期古隆起的演化;(2)四川盆地内的加里东古隆起是由川北的绵阳—广元古隆起与川西南—川中的乐山—龙女寺古隆起两个分支联合而成;(3)两大古隆起的差异演化及其地质响应对震旦系—古生界成藏具有重要的控制作用。结论认为,四川盆地西部加里东期发育中江—盐亭凹陷,凹陷周缘的加里东古隆起北侧构造轴(绵阳—广元地区)及东侧构造坡折带(南部—阆中—剑阁地区)长时间处于古地貌高部位,是油气运聚有利区,该有利区与乐山—龙女寺古隆起具有相似的成藏条件,是天然气勘探的重要新区和新领域。The Caledonian cycle is an important tectonic deformation period in the Sichuan Basin, during which the Leshan–Longnüsi paleo-uplift had an important controlling effect on oil and gas accumulation in Sinian and Lower Paleozoic strata. However, researches on the Caledonian movement in the Sichuan Basin have focused on the Silurian and Devonian tectonic cycles instead of the Caledonian movement during the Cambrian and Ordovician. Based on the newly collected and reprocessed regional seismic data, combined with the data from drilling wells and outcrops, the distribution of the early Paleozoic strata has been reinterpreted through regional seismic correlation, and the activity characteristics and geological response of the multi-stage tectonic movements in the Caledonian cycle have been studied, and the favorable areas of natural gas accumulation controlled by the Caledonian movement, such as paleo-deposition and paleo-structure, have been identified. The results show that:(1) During the Caledonian tectonic cycle, the Sichuan Basin was influenced by three tectonic movements, namely the Yunan movement, the Duyun movement and the Guangxi movement. The continuous tectonic activities controlled the evolution of the Caledonian paleo-uplifts in the western Sichuan Basin.(2) The Caledonian paleo-uplifts in the Sichuan Basin are composed of two branches, namely the Mianyang–Guangyuan paleo-uplift in the north of the Sichuan Basin and Leshan–Longnüsi paleo-uplift in the southwest of the Sichuan Basin.(3) The differential evolution of the two paleo-uplifts and their geological responses played an important role in controlling the hydrocarbon accumulation of Sinian–Paleozoic reservoirs. The conclusion is that: The Zhongjiang–Yanting sag was developed during the Caledonian period in western Sichuan Basin, and the northern axis of the Caledonian paleo-uplift(Mianyang–Guangyuan region) and the eastern slope break zone(Nanbu–Langzhong–Jiange region)on the periphery of the sag had been in the high position of palae

关 键 词：四川盆地 加里东运动 绵阳—广元古隆起 乐山—龙女寺古隆起 中江—盐亭凹陷 天然气勘探有利区 

分 类 号：P618.13[天文地球—矿床学]