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四川盆地新元古代构造属性及其油气地质意义

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前人利用四川盆地周缘及内部新元古代火成岩地球化学信息分析其构造背景,存在伸展和挤压两种截然不同的认识.地球物理资料显示盆地深部裂陷广布,而至陡山沱组沉积时期盆地中-西部存在明显的隆升剥蚀,两者之间的构造转换过程不清.针对这些问题,通过对四川盆地地震反射剖面构造解释,结合岩石地球化学、钻井数据与盆缘露头沉积层序分析,探索四川盆地新元古代构造演化过程与油气有利区.结果表明罗迪尼亚超大陆裂解至冈瓦纳汇聚阶段洋-陆俯冲是导致川西-川中裂谷向隆升剥蚀转化的原因,而川东新元古代中后期(820～551 Ma)始终处于构造沉降.川西-川中新元古界可能仅存在乌叶组同期的有机质岩,川中隆升区与川东沉降区之间发育碎屑岩储集体.
Neoproterozoic Tectonic Attributes and Their Petroleum Geological Significance in Sichuan Basin
According to geochemical information analysis of Neoproterozoic igneous rocks in the periphery and interior of Sichuan basin,there are two completely different understandings of extension and extrusion.The geophysical data show that the deep rifting of the basin is widespread,and there are obvious uplift and denudation in the central and western parts of the basin until the deposition period of Doushantuo Formation.The tectonic transformation process between the two is unclear.To solve these problems,in this paper it explores the Neoproterozoic tectonic evolution and favorable oil and gas areas of the Sichuan basin through the interpretation of seismic reflection profiles and the analysis of petrogeochemistry,drilling data and outcrop sedimentary sequences.The results in this study show that the oceanic subduction was the cause of the rift-uplift denudation transformation in the western and central Sichuan during the period from the breakup of the Rodinia supercontinent to the convergence of the Gondwana supercontinent,while the eastern Sichuan area was always in tectonic subsidence in the middle and late Neoproterozoic(820-551 Ma).There may only be organic rocks of Wuye Formation at the same time in the Neoproterozoic of western Sichuan and central Sichuan,and clastic reservoirs are developed between the uplift area of central Sichuan and the subsidence area of eastern Sichuan.

Sichuan basinNeoproterozoicstructure attributeRodinia supercontinentChengjiang movementpetroleum geology

陈友智、杨晓、吴建学、巫芙蓉、梁虹、吴育林、郭海洋、赵振伟、李晨睿、陈颖、王晓阳、于宁、王鹏、应倩、张帅、单宝玺

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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

中国石油集团西南油气田公司开发事业部,四川成都 610000

中国石油集团东方地球物理勘探有限责任公司西南物探分公司,四川成都 610213

贵州理工学院资源与环境工程学院,贵州贵阳 550003

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四川盆地 新元古代 构造属性 罗迪尼亚超大陆 澄江运动 石油地质

国家科技重大专项中国石油东方地球物理公司油气勘探新领域综合研究项目四川盆地下古生界-震旦系重点勘探领域研究与目标优选项目贵州省科技计划项目

2017ZX05035003黔科合JZ字[2015]2005

2024

10.3799/dqkx.2023.111

地球科学
中国地质大学

地球科学

CSTPCD北大核心
影响因子：1.447
ISSN：1000-2383
年,卷(期)：2024.49(6)