本文選題：頁巖氣　切入點：流體包裹體　出處：《石油學報》2017年11期

【摘要】：柴達木盆地東部石炭系頁巖氣儲層中多發(fā)育薄層粉細砂巖夾層,部分頁巖氣在形成后便近距離聚集在砂巖夾層中,因而賦存于砂巖夾層不同期次成巖礦物中的流體包裹體便成為研究頁巖氣儲層流體形成與演化過程的"活化石"。從頁巖有機地球化學特征、儲層顯微偏光/熒光特征、流體包裹體的溫度及成分特征等方面入手,系統(tǒng)分析了研究區(qū)頁巖氣的形成和保存條件。結(jié)果表明,研究區(qū)石炭系泥頁巖有機質(zhì)豐度高,有機質(zhì)類型為Ⅱ2—Ⅲ型,普遍處于成熟—高成熟階段。頁巖氣儲層存在2期次的油氣充注過程:第1期發(fā)生在早二疊世末期,油氣的成分成熟度較低,為砂巖夾層中環(huán)石英顆粒加大邊內(nèi)側(cè)分布的重質(zhì)油包裹體及現(xiàn)今儲層中殘留的褐色、灰褐色稀油瀝青;第2期發(fā)生在新近紀早期—現(xiàn)今,為砂巖夾層中沿石英顆粒成巖期后微裂隙成帶分布的凝析油及天然氣包裹體,是現(xiàn)今頁巖氣儲層油氣的主體。盆地東緣及東北緣部分砂巖夾層中氣體包裹體成分多為CH4+CO2、CO2+CH4+N2,屬于巖漿熱液作用下的變質(zhì)流體。研究區(qū)中部石炭系頁巖有機碳含量高、成熟度適中(Ro均值約為1.0%)、油氣保存條件較好,現(xiàn)今仍存可動輕質(zhì)油氣,具有良好的頁巖氣勘探前景。
[Abstract]:In the eastern part of Qaidam Basin, there are many thin layers of silty sand intercalation in the Carboniferous shale gas reservoir, and some shale gas is gathered in the sandstone intercalation at close range after its formation. Therefore, fluid inclusions that occur in diagenetic minerals of sandstone intercalation at different times become "living fossils" to study the fluid formation and evolution of shale gas reservoirs. The formation and preservation conditions of shale gas in the study area are systematically analyzed in terms of temperature and composition characteristics of fluid inclusions. The results show that the organic matter abundance of Carboniferous shale shale in the study area is high, and the type of organic matter is type 鈪，

本文編號：1678951