天然气勘探与开发2026，Vol.49Issue(2)：41-59,19.DOI:10.12055/gaskk.issn.1673-3177.2026.02.003
四川盆地新元古代裂谷体系发育的大地构造背景
Tectonic setting of the Neoproterozoic rift system development in the Sichuan Basin
摘要
Abstract
As the successive discovery of large Sinian gas fields such as Weiyuan,Anyue and Penglai in the Sichuan Basin,deep to ultra-deep strata have demonstrated attractive prospects of petroleum exploration.The primary task of deep to ultra-deep petroleum exploration in this basin is to determine the distribution and characteristics of the prototype basin,thereby revealing its early stage tectonic background.Based on the latest data such as gravity,magnetic,electrical methods,seismic surveys,drilling,paleomagnetism,magmatic rock ages,and geochemistry,the basement structure and tectonic position of the Sichun basin were clarified.This study reveals the peripheral tectonic processes and deep geological background,systematically analyzing the tectonic setting of the Upper Yangtze Block during different periods of the Neoproterozoic.The study suggests that the Yangtze Block may have formed through the amalgamation of the Shennong terrane in the northwest and an oceanic plateau in the southeast.The Yangtze Block and the Cathaysia Block collided between 820 and 810 Ma to form the South China Block.The Sichuan Basin exhibits a dual-basement configuration,comprising the Late Archean to Paleoproterozoic crystalline basement and the Mesoproterozoic folded basement.During the Neoproterozoic to Early Paleozoic,the Yangtze Block was located on the northwestern margin of the Rodinia supercontinent,close to the Australian or Indian continent.The Yangtze Block experienced three tectonic-magmatic events in the Neoproterozoic,reflecting the entire process of subduction and back-arc extension of the Proto-Tethys Ocean.After approximately 810 Ma,the Upper Yangtze Block entered an extensional tectonic regime,developing a series of"wide rift"basins in a back-arc setting.The Yangtze Block underwent a complete convergence-extension cycle during the Neoproterozoic,with the extensional rift basins being the primary target for deep to ultra-deep exploration studies.关键词
四川盆地/新元古代/板块构造位置/拼合基底/构造—岩浆事件/宽裂谷体系/扬子地块Key words
Sichuan Basin/Neoproterozoic/Tectonic position/Amalgamated basement/Tectonic-magmatic event/Wide rift system/Yangtze Block分类
能源科技引用本文复制引用
何登发,张自力,鲁国,黄涵宇,邓诗琦,杨志坤..四川盆地新元古代裂谷体系发育的大地构造背景[J].天然气勘探与开发,2026,49(2):41-59,19.基金项目
国家自然科学基金重点项目"上扬子克拉通盆地深层新元古代裂谷体系的结构、成因及其控油气作用"(编号:42330810),中国石油西南油气田公司科技攻关项目"四川盆地前震旦系裂谷特征与形成机制研究"(编号:JS2024-148). （编号:42330810）
