地质科技情报2018，Vol.37Issue(1)：169-176,8.DOI:10.19509/j.cnki.dzkq.2018.0123
鄂尔多斯盆地临兴A地区下石盒子组致密砂岩气成藏条件
Accumulation Conditions of Tight Sandstone Gas in the Lower Shihezi Formation in Linxing A Area, Ordos Basin
摘要
Abstract
This study discusses the source rock,reservoir,rock,cap rock and structural activity of Lower Shihezi Formation of Linxing A area in Ordos Basin based on numerous geochemical data and reservoir analysis.The study results show that the accumulation conditions of the Lower Shihezi Formation of Linxing A area are quite good for the formation of large-scale tight sandstone gas reservoirs.The widely distributed source rock mainly contains type Ⅱ2 and Ⅲ organic matters,and is characterized by large thickness,high total organic carbon content,high maturity and strong hydrocarbon generation capability.While the tight sandstone reservoir of the Lower Shihezi Formation is heterogeneous,generally with low porosity and permeability and high porosity-permeability zone developed partially.The mudstone in the Upper Shihezi Formation and the source rocks are good for the preservation of tight sandstone gas reserovoir providing favorable conditions for the development of the reservoir as it yields large-scale gas generation from source rock and structural faults as migration paths.The occurrence of peak gas expulsion from Late Jurassic to Early Cretaceous and the occurrence of densification of the reservoir form Late Triassic to Middle Jurassic demonstrate a favorable time series for the formation of tight sandstone gas reservoirs.The source rocks and widespread reservoirs are closely connected,and the gases accumulate in the sandstone body under the force of gas expansion and stored in reservoirs due to the time series.关键词
临兴A地区/下石盒子组/致密砂岩气/烃源岩/成藏条件Key words
Linxing A area/Lower Shihezi Formation/tight sandstone gas/source rock/accumulation condition分类
天文与地球科学引用本文复制引用
陈晓智,庞雄奇,邵新荷,姜福杰,刘铁树,李龙龙,郑定业,呼延钰莹..鄂尔多斯盆地临兴A地区下石盒子组致密砂岩气成藏条件[J].地质科技情报,2018,37(1):169-176,8.基金项目
国家自然科学基金项目(U12622005) （U12622005）
中海石油(中国)有限公司综合科研项目(YXKY-2016-ZY-04) （中国）
