Geological conditions, reservoir evolution and favorable exploration directions of marine ultra-deep oil and gas in China

LI Jianzhong,TAO Xiaowan,BAI Bin,HUANG Shipeng,JIANG Qingchun,ZHAO Zhenyu,CHEN Yanyan,MA Debo,ZHANG Liping,LI Ningxi,SONG Wei

Fig. 3. Comparison of carbon isotopic compositions of solid bitumen and kerogen in the Sinian-Cambrian natural gas in the Central Sichuan-Southern Sichuan region of the Sichuan Basin (modified after References [22-27]). —C1l—Longwangmiao Formation; Z2d—Dengying Formation; S1l—Longmaxi Formation; —C1q—Qiongzhusi Formation; Z2d3—third member of Dengying Formation).