Structure characteristics and deep hydrocarbon significance of Nanhua rift in central area of Sichuan Basin
Received date: 2023-01-02
Revised date: 2023-02-23
Online published: 2023-07-13
Supported by
The National Natural Science Foundation Enterprise Innovation and Development Joint Fund Project(U19B6003-01)
Affected by the breakup of Rodinia supercontinent, rift basins were widely developed in the Yangtze block, North China block and Tarim block during the Nanhua Period. The existence of deep rift basins played an important role in controlling the late tectonic evolution of the basin and the distribution of deep oil and gas. The Sichuan Basin is located in the western margin of the Yangtze block. Because there are few wells in the basin that reveal the stratigraphic characteristics of the Nanhua System, the research on the structural characteristics and genetic mechanism of the Nanhua rift in the Basin is relatively low. This paper takes the Nanhua rift in central area of Sichuan Basin as the research object, uses the method of drilling and seismic combination to analyze the geometric characteristics of the rift basin, recover the kinematic process, and preliminarily explore the genetic mechanism of the rift basin under the constraints of the regional tectonic background. The research reveals that: (1)NE trending narrow and long rifts dominated by extensionism developed in Nanhua Period in the central area of Sichuan Basin, the boundary of which is mostly “fault overthrust” or “double fault”, The internal horst graben type and ladder type faults are developed. (2)The tectonic evolution of the rift valley is divided into three main stages: the opening stage of the rift basin, the synsedimentary stage and the sedimentary overlap stage. The formation and evolution of the Nanhua rift valley has an obvious control effect on the structural deformation of the overlying strata, and then affects multiple sets of source-reservoir associations and oil and gas distribution in the basin. (3)Based on the results of previous petrogeochemical studies, it is comprehensively believed that the Nanhua rift in Sichuan Basin developed in the environment of continental crust thinning after plate subduction and collision, showing the nature of intracontinental rift. The fault activity under the extensional tectonic background is the key factor affecting the development of Cambrian carbonate hydrothermal solution reservoir and the formation of natural gas reservoir.
Shunqi CHAI , Chuanxin LI , Congsheng BIAN , Tian GAO , Zheng SUN . Structure characteristics and deep hydrocarbon significance of Nanhua rift in central area of Sichuan Basin[J]. Natural Gas Geoscience, 2023 , 34(7) : 1203 -1217 . DOI: 10.11764/j.issn.1672-1926.2023.03.001
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