Shale gas accumulation conditions and favorable zones of Silurian Longmaxi Formation in south Sichuan Basin,China
Abstract：Based on latest drilling data,outcrop geologic survey around the area and laboratory test results of lots of rock samples,analysed shale gas generation conditions and potential of Silurian Longmaxi shale in south of Sichuan Basin with the regional distribution,organic geochemical and reservoir characteristics,gas concentration and reservoir pressure of organic-rich shale rock.Through integrated study,it is thought that：Silurian Longmaxi Formation in the study area features high organic content（TOC：0.35%～18.40%,average of 2.52%）,high net shale thickness（20～260 m）,high brittle mineral content（more than 40%～70%）,lots of nanoporosity in organic and high gas content（0.3～5.1 m3/t,average of 1.9 m3/t）,Moderate burial depth（2 000～3 600 m） is favour of the generation and accumulation of shale gas.Silurian Longmaxi Formation is one of the favorable stratas of shale gas exploration and development in China,that accessed frequently gas show in drilling processes and obtained industrialization breakthrough;areas of Weiyuan,Longchang-Yongchuan and Changning-Gongxian are three realistic and favorable targets for Silurian Longmaxi shale gas exploration and development.
Keywords：shale gassouth of Sichuan BasinLongmaxi Formationorganic nano-porosityfavorable exploration zones
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 782-787 )