Abstract
In recent years, the shale gas development boom around the world has made finegrained sedimentary rocks become the focus and hotspot of sedimentological research. Lithofacies are rock types and assemblages formed in a certain sedimentary environment, and are important parameters in formation evaluation. The lithofacies classification of fine-grained sedimentary rocks is an important basis for the study of hydrocarbon source rocks, shale oil and gas and tight oil reservoirs. Anchored in the previous studies, the lithofacies classification scheme of fine grained sedimentary rocks in study area based on mineral composition was established in this paper. The results prove that the main lithofacies of Qiongzhusi formation in study area are mainly felsic clay rocks and clayey felsic fine-grained sedimentary rocks, and a small number of which are dolostone, limestone, felsic fine-grained sedimentary rocks, dolomitic felsic fine-grained sedimentary rocks, clayey felsic fine-grained sedimentary rocks, felsic dolostone, and dolomitic mixed fine-grained sedimentary rocks. This study can provide some geological basis for the evaluation and regional election of shale gas in this area.
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