Oil and gas exploration potential of the Permian multi-stage platform-margin zone, western Sichuan Basin.

doi:10.13745/j.esf.sf.2022.8.22

Abstract

Abstract:

Situated in stable cratonic margins during the Permian the western Sichuan Basin experienced tectonic-sedimentary differentiation under jointly the actions of the Hercynian movement, Dongwu movement and Emei rift. Adopting the research idea that tectonic movement controls basin, basin controls facies, facies control reservoir-forming elements,a new round of research is carried out in the western Sichuan Basin to investigate the control of petroleum accumulation by Permian tectonic-sedimentary differentiation and determine the exploration potential of marine carbonate rocks in the western Sichuan Basin. During the Permian, the Sichuan Basin is dominated by tensional/extensional tectonic activities and a general sedimentary pattern of “uplift in the south, rift in the west, and tension in the north” is revealed. The Permian multi-stage tectonic movements lead to the formation of a series of intra-platform rifts in western Sichuan, which, combined with the Permian sea-level change, control the multi-stage platform-margin development from the Qixia to Changxing formations. The NE-SW and NW-SE fault systems developed in the northwestern basin control the lithofacies paleo-geographic pattern of this area. Among them, the Longmenshan fault belt largely controls the development of platform margins N-E along the northwestern edge of the upper Yangtze platform from the Devonian to Permian Qixia periods. From the Maokou to Changxing periods, the platform margins—spreading N-E in the western Sichuan Basin and N-W along rifts in the Zitong-Laoguanmiao areas—are jointly controlled by cratonic margins and intra-platform rifts, and the multi-stage platform margins of the Qixia, Maokou, Wujiaping and Changxing formations are superimposed in the Jiange area. In the western Sichuan Basin, the Permian multi-stage platform margins control the superposition of multi-layer, high-quality beach facies reservoirs and reef reservoirs, which is the main factor controlling the development of large-scale Permian porous reservoirs in this area. The coupling of multi-stage paleo-rift depression, multi-stage platform-margin zones and large-scale paleo-uplift in the reservoir-forming stage is conducive to the large-scale oil and gas accumulation. Vertically superimposed and spreading N-W over a wide range the multi-layer platform margins of western Sichuan possess trillion-ton petroleum resource potential and are an important replacement exploration target for marine carbonate rocks in the Sichuan Basin.

Key words: western Sichuan Basin, Hercynian, Permian system, platform-margin zone, oil and gas exploration potential

CLC Number:

P624

YANG Yu, WEN Long, CHEN Cong, WANG Hua. Oil and gas exploration potential of the Permian multi-stage platform-margin zone, western Sichuan Basin.[J]. Earth Science Frontiers, 2023, 30(1): 1-10.

Figures/Tables 9

Fig.1 Structural partition in Sichuan Basin

Fig.2 Planar location of large-scale Permian fault,western Yangtze block. Modified after [6]

Fig.3 Dynamic mechanism of the Permian structure in Sichuan Basin and its periphery(profile location as seen in Fig.2)

Fig.4 Diagrams of sedimentary facies in the Permian, Sichuan Basin

Fig.5 Sedimentary-facies profile in the multiple-stage Permian platform margin, western Sichuan Basin

Fig.6 Superimposition of the thickness of source rock in the Cambrian Qiongzhusi Formation and the multiple-stage Permian platform margin in Sichuan Basin and its periphery

Fig.7 Reservoir Characteristics of the multiple-stage Permian platform margin, western Sichuan Basin

Fig.8 Overlapping relation, source-reservoir assemblage, and hydrocarbon-charging mode in the multiple-stage platform margin, western Sichuan Basin

Fig.9 Comprehensive evaluation on the main factors affecting reservoir forming in the multiple-stage platform margin, western Sichuan Basin

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