羌塘盆地页岩气成藏地质条件初探

Study on Geological Condition of Shale Gas Accumulation in Qiangtang Basin

页岩气作为一种前景巨大的清洁能源资源,近年来迅速成为油气地质领域研究的热点,而发育有多套优质泥页岩质烃源岩的羌塘盆地页岩气勘探还处于探索阶段。通过分析国内外主要页岩气盆地勘探开发关键地质参数,归纳总结了有利页岩气勘探区评价标准。在对羌塘盆地主要泥页岩质烃源岩层厚度、有机质成熟度、有机质类型、有机碳含量等已知关键页岩气地质参数进行综合评价的基础上,提出了羌塘盆地主要发育有两套有利页岩气勘探层:上三叠统泥页岩层、下侏罗统曲色组泥页岩层;遴选了5个有利页岩气勘探区:藏夏河有利区、沃若山有利区、土门格拉有利区、毕洛错有利区、木苟日王有利区。

Shale gas, as a clean energy of great prospects, has become the research hotspot in petroleum geology field, recently. Shale gas exploration of Qiangtang Basin, where several high quality mud-shale source rocks developed, is still in initial stage. Through the analysis of key geological parameters of domestic and international main shale gas basins in exploration and development, we sum up the evaluation standard of favorable shale gas exploration targets. Based on the comprehensive evaluation of the main mud-shale hydrocarbon source rock thickness, organic matter maturity, organic matter type, organic carbon content of Qiangtang Basin, we discover that in Qiangtang Basin, two sets of favorable shale gas exploration layer developed： mud-shale layer of the upper Triassic, mud-shale layer of lower Jurassic Quse Formation. And we select five favorable shale gas areas： Zangxiahe favorable area, Woruoshan favorable area, Tumengela favorable area, Biluocuo favorable area, Mugouriwang favorable area.