Study on the Characteristics of Siliceous Rocks and Their Influence on Reservoir Karstification in Longnyusi Area of Central Sichuan

doi:10.3969/j.issn.1006-6535.2023.01.006

Abstract

Abstract: The siliceous rocks are commonly developed in the upper sub-section of the Fourth Member, Sinian Dengying Formation, Anyue Gasfield in central Sichuan, and their influence on reservoir karstification is still unclear, so it is necessary to conduct a corresponding study. For this reason, based on lithology, logging response characteristics, the cores and slices were described in details through observations, the study of the influence of siliceous rocks on reservoir karstification in the upper sub-section of the Fourth Member, Dengying Formation, in Longnyusi Area of Central Sichuan was carried out using basic characteristics of siliceous rocks, reservoir comparison diagram and siliceous plan, and the results show that The siliceous rocks in the study area are mainly algal laminated siliceous rocks, pure siliceous rocks and dolomitic siliceous rocks; the siliceous bed is divided into 2 sections in the upper sub-section of the Fourth Member, Dengying Formation, and the reservoirs above and below the siliceous bed are in good conditions, and the thickness of the siliceous rocks can be seen on the plane to be thinned to the northeast as well as to the southeast; the siliceous rocks are fractured by the Tongwan movement and suffer from dissolution enlargement, which cannot block the karst fluid infiltration; the fault cutting through the siliceous bed has no effect on the stimulation of the karst reservoirs. Therefore, siliceous rocks have less effect on the reservoir karstification. The research results have laid a foundation for finding favorable areas for reservoir development in the Longnyusi area within the platform.

Key words: Dengying Formation, siliceous rocks, reservoir, karst action, Sinian System, Longnyusi Area, Anyue Gasfield

CLC Number:

TE122

Lin Yi, Han Shaorui, Xia Maolong, Zeng Deming, Jia Song, Liao Mingguang. Study on the Characteristics of Siliceous Rocks and Their Influence on Reservoir Karstification in Longnyusi Area of Central Sichuan[J]. Special Oil & Gas Reservoirs, 2023, 30(1): 41-49.

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