Earth Science Frontiers ›› 2015, Vol. 22 ›› Issue (3): 161-173.DOI: 10.13745/j.esf.2015.03.014
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WANG Hua-Jun, YANG Zhi-Ru, HAN Bing
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Abstract:
According to previous research and petroleum exploration data, the Sichuan Basin existing in the Yangtze Plate has been researched. The basin has undergone five evolution stages: Sinian faulted basin evolution, CambrianSilurian faulted basin evolution and inversion, CarboniferousPermianMiddle Triassic basin evolution, Late Triassic foreland basin and JurassicEarly Cretaceous large intracontinental basin evolution and the Late CretaceousCenozoic uplift evolution. Sinian, CambrianSilurian basin evolution was controlled by the peripheral NEtrending faults; basin strata are clastic, evaporite and carbonate rocks; the basement has a structural pattern of west uplifting and east depressing. The late Middle Ordovician tectonic events formed the Chuanzhong Uplift, and the late Silurian tectonic events led to the uplift and erosion of the basin as a whole. After a late Silurian tectonic deformation and uplift, the CarboniferousMiddle Triassic basin was characterized by epicontinental sedimentary evolution of carbonates and gypsumsalt rock; the basement has a structural pattern of southwest uplifting and northeast depressing in this stage. In the end of Maokou sedimentary stage, tectonic events led to the uplift and erosion of the basin; in the end of Middle Triassic, tectonic events formed the LuzhouKaijiang palaeohigh. The Late Triassic foreland basin was superimposed on the early marine basins; the basement has a structural pattern of east uplifting and west depressing in this stage. The JurassicEarly Cretaceous basin is a large intracontinental faulted basin; in the end of the Jurassic, tectonic events formed eastern Sichuan structural zone; in the end of early Cretaceous, tectonic events led to the demise of the basin and the overall uplift. The Late CretaceousCenozoic sediment was confined in the southwest of the Sichuan Basin. The evolution of superposed basins formed several sets of organicrich source rocks, such as Sinian, Lower Cambrian, Wufeng Formation of Upper Ordovician, Longmaxi Formation of Lower Silurian, Liangshan Formation and Longtan Formation of Permian, coalbearing formation of upper Triassic and lower Jurassic. The gypsum, salt, mud and coalbearing rocks developed in the Cambrian, Silurian, Permian, LowerMiddle Triassic, Upper Triassic and Jurassic were distributed with vertical superimposition and horizontal composite joint. These seal and source rocks formed highquality combinations within the basin, which is the basis of hydrocarbon enrichment. A highquality reservoir was developed under each set of highquality cap.The good reservoirtraps combination has become a necessary condition of oil and gas accumulation. There formed lower, middle and upper assemblages of exploration formations in the basin. Exploration results show that the palaeohigh, paleoslopes and ancient source rocks controlled the oil and gas distribution of the basin
Key words: Sichuan Basin, passive continental margin basin, palaeouplift, superimposed evolution, petroleum accumulation
CLC Number:
P618.1302
WANG Hua-Jun, YANG Zhi-Ru, HAN Bing. Superposed evolution of Sichuan Basin and its petroleum accumulation.[J]. Earth Science Frontiers, 2015, 22(3): 161-173.
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URL: https://www.earthsciencefrontiers.net.cn/EN/10.13745/j.esf.2015.03.014
https://www.earthsciencefrontiers.net.cn/EN/Y2015/V22/I3/161