Analysis of shale gas potential of carboniferous Jinling formation in Yixing area

The sedimentary environment of carboniferous Jinling formation in Yixing-Xuancheng area, is littoral facies, with layer thickness rich in organic being about 10 m. Organic geochemistry data show that the Jinling formation black shales are rich in organic with average total organic carbon contents being around 0.8%, and with high maturation around 1.62% ∼ 1.8% of organic matter.In terms of kerogen types, the organic matter is mostly II₂- and III-type. The shale porosity of Jinling Formation is 2.99%, and Micron level microfissures and micropores mainly inter and intra granular. Organic pores are weakly developed, but microfractures are well developed. Methane maximum absorbance of mudstone from Jinling formation is 2.95 cm³/g in the condition of 30℃ and 10 MPa. The shales gas of Jinling formation in Yixing area have certain exploration prospect through the present integrated study. (authors)