川东北巫溪地区五峰组—龙马溪组页岩气成藏条件与勘探前景

发布时间：2018-04-29 22:21

本文选题：页岩气 + 碳同位素　；参考：《天然气地球科学》2017年05期

【摘要】：川东北巫溪地区是四川盆地五峰组—龙马溪组页岩气勘探正在初步探索的新区。通过跟踪、评价巫溪地区最新探井的页岩气相关地质参数,以及页岩储层和含气性特征,页岩气地球化学特征和古生物特征,认为巫溪地区虽然具有良好的页岩气物质基础,但是遭受了非常严重的多期构造破坏。主要表现为乙烷碳同位素明显高于其他成熟度相似区块,以干酪根晚期裂解气为主,反映非常高的排油气效率;巫溪地区页岩孔隙度极低,与构造作用强和滞留油保存少有关;近断裂的页岩甚至出现微弱的变质作用,岩心劈理现象严重,笔石化石表皮遭受热解破坏。综合研究认为巫溪地区页岩气有远景资源,但是现阶段商业开发的可能性极低。
[Abstract]:Wuxi area in northeast Sichuan is a new area for shale gas exploration of Wufeng formation-Longmaxi formation in Sichuan Basin. By tracing and evaluating the shale gas related geological parameters of the latest exploration wells in Wuxi area, as well as the shale reservoir and gas bearing characteristics, shale gas geochemical characteristics and paleontological characteristics, it is concluded that although the Wuxi area has a good shale gas material foundation, But suffered a very serious multi-stage structural damage. The ethane carbon isotope is obviously higher than other similar maturity blocks, mainly in the late kerogen cracking gas, which reflects the very high oil and gas expulsion efficiency, the porosity of shale in Wuxi area is very low, which is related to the strong tectonic action and the preservation of the remaining oil. The near fault shale even shows weak metamorphism, the core cleavage phenomenon is serious, and the epidermis of the graptolite fossil is destroyed by pyrolysis. The comprehensive study shows that shale gas in Wuxi area has potential resources, but the possibility of commercial development is very low at the present stage.
【作者单位】：中国石油西南油气田勘探开发研究院;中国石油西南油气田公司;西南油气田公司重庆气矿;
【基金】：四川省科技厅重大科技专项“四川盆地下古生界页岩气资源评价及选区”(编号:2015SZ0001)资助
【分类号】：P618.13

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