Features of cavity-type carbonate reservoirs in the Lower Permian of the southern Sichuan region
The Lower Permian carbonate reservoirs in the southern Sichuan region exhibit significant natural gas resource potential.This study provides a detailed analysis of the reservoir characteristics in the Qixia and Maokou formations of the southern Sichuan region,revealing the rock types,storage spaces,and reservoir physical properties of the Lower Per-mian carbonates.The results indicate that the primary reservoir rocks in the region include microbial binding limestone,granular limestone,and dolomite.Among these,the Qixia for-mation predominantly consists of microbial binding limestone modified by karst processes,followed by dolomite.The Maokou formation is primarily composed of granular limestone,with dolomite as a secondary component.The storage spaces are mainly classified into pores,caves,and fractures.Data on porosity and permeability reveal that both the Qixia and Maokou formations generally exhibit low porosity and low permeability characteristics,with some ar-eas showing higher porosity segments.Although geological data for the Lower Permian dolomite reservoirs are limited,available data suggest that the porosity of dolomite is gener-ally higher than that of other rock types,indicating superior reservoir performance.This study provides a crucial foundation for the exploration and development of the Lower Permi-an reservoirs in the southern Sichuan region.
biogenic limestonedolomiteporosity typesstorage space
万方数据
维普
