鲁西地区上古生界页岩气成藏条件研究

Study on Upper Paleozoic Shale Gas Reservoiring Condition in Western Shandong

以鲁西地区上古生界海陆过渡相暗色泥页岩为研究对象,通过获取分析暗色泥页岩有机地球化学及岩石物性等资料,认为鲁西地区上古生界暗色泥页岩具备形成页岩气的物质基础,且成藏条件优越。暗色泥页岩厚度大,有机质丰度高,有机质类型以Ⅲ型为主,热演化程度适中,储层微孔隙-纳米孔发育,泥页岩中脆性矿物丰富,有利于页岩气的形成、富集和后期改造。在鲁西地区上古生界山西组、太原组有机质泥页岩发育的凹陷盆地中部,盖层保存完整,后期改造活动弱,有利于页岩气成藏,为鲁西地区上古生界的页岩气勘探潜力区。

Taking the upper Paleozoic marine -terrestrial transitional facies dark argillutite as subject investigated, through acquisition and analysis of dark argiUutite organic geochemical and rock physical property data, considered that the dark argiUutite has material ba- sis to form shale gas with advantageous reservoiring condition. The dark argillutite has large thickness, high organic matter abundance. The organic matter mainly belongs to type III medium thermal evolution degree, reservoir micropore, nanopore well developed, and a- bundant brittle minerals in argillutite, thus beneficial to shale gas formation, enrichment and later reformation. In the upper Paleozoic Shanxi and Taiyuan formations organic matter well developed argiHutite depression basin middle part, overburden is perfectly pre- served, later reformation weak, in favor of shale gas reservoiring, and therefore the area is potential shale gas exploration area in west- ern Shandong.