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中上扬子区志留系龙马溪组是在局限的浅海环境下发育的一套优质烃源岩,尤以川南、川北及渝东南—黔北几个沉积中心黑色页岩最为发育,厚度大、有机质含量高。川南及川北地区干酪根类型以Ⅰ型为主,有机质成熟度为高成熟中晚期,以生成裂解气-湿气为主;渝东南—黔北地区干酪根类型以Ⅱ1型为主,有机质成熟度为过成熟,以生成干气为主。通过分析这几个地区该套地层的有机地球化学参数及钻遇该层位井的录井资料,借鉴北美地区页岩气勘探实践,认为中上扬子区志留系龙马溪组具有形成页岩气气藏的有利条件。建深2井在龙马溪组见到了气测异常及多个异常压力带,这些都显示了中上扬子区龙马溪组页岩气巨大的勘探潜力。
The Longmaxi Formation of the Silurian in the Upper Yangtze Region is a set of high-quality source rocks developed in a limited shallow sea environment. Especially, the black shales in the south, north Sichuan and southeastern South-Qianbei sedimentary centers are most developed with large thickness, High organic matter content. The type of kerogen in the south of Sichuan and the north of Sichuan is mainly type I, and the maturity of organic matter is middle and late maturity, with the formation of pyrolysis gas and moisture. The type of kerogen in southeastern-north Guizhou is mainly Type II1, organic matter maturity To mature, to generate dry gas-based. By analyzing the organic geochemical parameters of the set of strata in these areas and logging data encountered in this layer of well and drawing lessons from the exploration of shale gas in North America, it is considered that the Silurian Longmaxi Formation in the Upper Upper Yangtze Region has the characteristics of shale formation Gas reservoirs favorable conditions. The Jianshen-2 well met the gas abnormalities and multiple abnormal pressure zones in the Longmaxi Formation, all of which showed the huge exploration potential of the Longmaxi Formation shale gas in the Upper-Upper Yangtze region.