郭兰,郭顺,丁超,马志武
GUO Lan,GUO Shun,DING Chao,MA Zhiwu

• 1:延长油田股份有限公司
• 2:陕西延长石油(集团)有限责任公司
• 3:西安石油大学地球科学与工程学院
• 4:陕西省油气成藏地质学重点实验室

摘要(Abstract)：

为了寻找致密储层的有利砂岩储层类型，利用岩心铸体薄片、X-衍射、高压压汞、扫描电镜、物性等资料，精细划分砂岩储层类型，分析成岩作用与孔隙演化，结合包裹体测试分析，对不同砂岩储层类型的成岩演化与烃类充注关系进行研究。结果表明：山西组2段划分为5种砂岩储层类型，其中纯石英砂岩和富石英低塑性岩屑砂岩形成于距今220～190 Ma的第1次油气充注时期，储层孔隙度相对较高，为20.1%～22.9%，有利于烃类充注；储层在早白垩世开始进入致密化窗口，此时烃类大量充注成藏，为边致密化边成藏阶段；在早成岩阶段，高凝灰质杂基石英砂岩、富塑性颗粒岩屑砂岩及碳酸盐致密胶结砂岩已基本被压实，在距今190～100 Ma的烃类大规模成藏的窗口期，孔隙度小于等于4.4%的储层被致密化，不利于烃类充注；不同砂岩类型的成岩过程导致油气充注的选择性与储层含油气的差异性。研究成果可为该区寻找天然气富集的有利砂岩储层提供地质依据。
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 sandstone, 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 entered 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, plastic-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 hydrocarbon 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(KeyWords)： 储层致密化;成藏期次;山西组2段;延安气田;鄂尔多斯盆地
reservoir tightening;hydrocarbon accumulation stage;Shan-2 Member;Yan'an gas field;Ordos Basin

Abstract:

Keywords:

基金项目(Foundation): 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）;; 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）

作者(Author): 郭兰,郭顺,丁超,马志武
GUO Lan,GUO Shun,DING Chao,MA Zhiwu

DOI: 10.19597/J.ISSN.1000-3754.202402010

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