Influence analysis of oil immersion on hydrocarbon source rock geochemical indicators

The analysis test of geochemical indicators,such as rock pyrolysis,total organic carbon and chloroform bitumen " A",total hydrocarbon content and saturated hydrocarbon before and after wash oil processing of oil soaked shale samples in Wangchang area of Qianjiang sag in Jianghan basin has been carried out,and then the influence of oil immersion on testing has been analyzed.The results indicate the influence of oil immersion in salt rhythm from Qianjiang formation is not big,while its influence on the amount of hydrocarbon potential,chloroform bitumen " A" content and hydrocarbon content is bigger.Therefore,based on the evaluation of the organic carbon abundance,the indicators are more practical.The hydrocarbon source rocks in Eq4 2 307.04~2324.04 m of Wangyun 12 Well are mainly of poor-non hydrocarbon source rocks,local source is less and the oil immersion in the hydrocarbon source rock is mainly caused by mature oil migration.These findings are of important guiding significance for oil shale exploration potential in Qianjiang formation.