Characteristics and Forming Processes of Reef-Shoal Reservoir in Changhsing Formation of the Eastern Sichuan Basin in Dianjiang, China

Luo, Wei; Shi, Zhou; Tian, Yamin; Hu, Xiuquan

doi:10.1007/s13369-021-05863-6

Cited by 1 publication

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“…The Ordovician began to water-transgress, and the Sichuan Basin was dominated by shelfto-basin facies. At the end of the Silurian, the Late Caledonian movement came the uplift and denudation of the Leshan-Longnusi paleo-uplift, resulting in an angular unconformity between the Cambrian and Permian strata in the southwestern Sichuan Basin (Su et al, 2020;Luo et al, 2022). The Xixiangchi Formation in the Southwestern Sichuan Basin is denuded (Gu et al, 2020;Li et al, 2020) (Figure 1B).…”

Section: Geological Settingmentioning

confidence: 99%

Key factors affecting hydrocarbon accumulation in ancient dolomite gas reservoirs of Xixiangchi formation (Southern Sichuan Basin, China)

Luo

Dianguang³

et al. 2023

Front. Earth Sci.

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The Upper Cambrian Xixiangchi Formation in the Southern Sichuan Basin, China, has favorable hydrocarbon accumulation conditions. The accumulation factors and enrichment conditions of this formation were key considerations in this study. By analyzing core, thin section, seismic, and geochemical data, the research shows that there are many sets of granular and crystalline dolomite reservoirs in the Xixiangchi Formation vertically, with thin thickness of single-reservoir. During the transformation of karst and tectonism, dissolution pores and fractures developed to form an ideal reservoir space. The reservoir of the Xixiangchi Formation is connected to the Lower Cambrian source rock through a fault system. The high-energy shoal facies of the Xixiangchi Formation are located on the oil and gas migration path, providing an appropriate reservoir space for forming the source reservoir configuration relationship between the lower generation and upper reservoir. The key factors affecting hydrocarbon accumulation in the Xixiangchi Formation are sufficient oil and gas supply, development of inherited paleo-uplift, effective transportation system, and favorable reservoir-forming combination. The inherited paleo-uplift controls the distribution of gas reservoirs. Owing to the short migration distance of oil and gas, hydrocarbon is found near source hydrocarbon accumulation, and the paleo-uplift slope area should be targeted for exploration in future studies.

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Section: Geological Settingmentioning

confidence: 99%