大庆石油地质与开发2025，Vol.44Issue(3)：22-31,10.DOI:10.19597/J.ISSN.1000-3754.202402010
鄂尔多斯盆地延安气田山西组2段砂岩储层致密化与天然气成藏关系
Relationship between sandstone reservoir tightening and gas accumulation of Shan-2 Member in Shanxi Formation of Yan'an gas field in Ordos Basin
摘要
Abstract
In order to find favorable sandstone types of tight reservoir,the data of core cast thin section,XRD,high-pressure mercury injection,SEM and physical properties are used to finely classify sandstone reservoirs and to analyze diagenesis and pores evolution.Relationship between diagenetic evolution of different types of sandstone reservoirs and hydrocarbon charge is studied combining with analysis of fluid inclusion test.The results show that Shan-2 Member of Shanxi Formation is divided into 5 sandstone reservoir types.Among them,pure quartz sand-stone,quartz-rich and low-plastic debris sandstone formed in the first hydrocarbon charge stage in 220～190 Ma,with relatively high reservoir porosity of 20.1%～22.9%,being conductive to hydrocarbon charge.Reservoir en-tered tightening window in early Cretaceous,with much hydrocarbon charged and accumulated,being the stage of simultaneous tightening and accumulation.In early diagenetic stage,high-tuffaceous matrix quartz sandstone,plas-tic-rich grain lithic sandstone and carbonate cemented sandstone were generally compacted.In window period of 190～100 Ma with large-scale hydrocarbon accumulation,reservoirs with porosity of≤4.4%are tightened,being not conducive to hydrocarbon charge.Diagenetic process of different sandstone types leads to selectivity of hydrocar-bon charge and difference of hydrocarbon-bearing in reservoirs.The research provides geological basis for finding favorable gas-rich sandstone reservoirs in this area.关键词
储层致密化/成藏期次/山西组2段/延安气田/鄂尔多斯盆地Key words
reservoir tightening/hydrocarbon accumulation stage/Shan-2 Member/Yan'an gas field/Ordos Basin分类
石油、天然气工程引用本文复制引用
郭兰,郭顺,丁超,马志武..鄂尔多斯盆地延安气田山西组2段砂岩储层致密化与天然气成藏关系[J].大庆石油地质与开发,2025,44(3):22-31,10.基金项目
陕西省教育厅项目"流体包裹体约束下鄂尔多斯盆地上三叠统延长组油气成藏的构造物理化学参数研究"(20JS115) （20JS115）
陕西省自然科学基础研究计划项目"鄂尔多斯盆地南部奥陶系油气成藏年代及其临界转换参数"(2017JQ4013). （2017JQ4013）
