摘要
鄂尔多斯盆地储层非均质性较强,含油层系众多,纵向上储层物性、储集性能存在较大差异。以鄂尔多斯盆地中西部地区延安组和延长组上、中、下组合储层为研究对象,通过岩心观察、铸体薄片、阴极发光、物性测试、高压压汞等分析测试,对储层岩石学、储集性能差异等展开研究,明确控储因素,分析不同优势储层之间的差异性。研究结果表明:研究区储层在岩性、物性、储集空间类型、孔喉大小等方面均存在较大差异。延安组储层在物性、储集性能上明显优于延长组,延长组上、中、下组合随埋深增加,其储层物性及储集能力逐渐变差。研究区地层纵向上自上而下水动力条件逐渐变弱,粒度变细,地层原始物性受其沉积环境的影响也自上而下逐渐变差。延长组上组合孔隙受溶蚀作用和绿泥石胶结作用影响较大,中组合受绿泥石和碳酸盐胶结作用影响较大,下组合则以碳酸岩胶结及压实填充作用为主。延安组与延长组上、中组合中微裂缝与微裂隙相对欠发育,下组合中微裂隙发育。
The reservoirs in the Ordos Basin are highly heterogeneous,with numerous oil-bearing layers,and there are great differences in reservoir physical properties and reservoir properties in the vertical direction.The reservoirs of Yan'an Formation and the upper,middle,and lower combination of the Yanchang Formation in the central and western Ordos Basin are taken as the research objects.Through core observation,castingthin sections,cathode luminescence,physicalproperty testing,high-pressure mercury injection,and other analytical tests,the differences in reservoir petrology and reservoir properties are studied,the reservoir-controlling factors are defined,and the differences between different dominant reservoirs are analyzed.The results show that there are large differences in lithology,physicalproperties,reservoir space types,pore throat sizes,and other aspects of the reservoirs in the study area.The physical properties and reservoir properties of the Yan'an Formation are better than those of the Yanchang Formation.The reservoir physical properties and storage capacity of the upper,middle,and lower combinations of the Yanchang Formation gradually deteriorate with the increase of burial depth.The hydrodynamic conditions in the study area gradually weaken from top to bottom,the grain size becomes finer,and the original physical properties of the formations gradually deteriorate from top to bottom due to the influence of their sedimentaryenvironment.The pores of the upper combination of the Yanchang Formation are affected by dissolution and chlorite cementation,the middle combination is affected by chlorite and carbonate cementation,and the lower combination is dominated by carbonate cementation and compaction filling.Microcracks and micro-fissures are relatively underdeveloped in the upper and middle combinations of Yan'an and Yanchang Formations,while microcracks are well developed in the lower combinations.
作者
邓国政
姚志刚
陈峰
杜治伟
高攀明
Deng Guozheng;Yao Zhigang;Chen Feng;Du Zhiwei;Gao Panming(School of Geosciences and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065;Shaanxi Provincial Key Laboratory of Petroleum Accumulation Geology,Xi'an Shiyou University,Xi'an Shaanxi 710065;Wuqi Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Yan'an Shaanxi 717600)
出处
《中外能源》
CAS
2024年第7期40-49,共10页
Sino-Global Energy
基金
国家自然科学基金项目“不同应力系统作用下陆相页岩油储层纳米孔缝变形及扩展微观机理研究”(编号:51974253)。
关键词
储层物性
储集性能
储集空间类型
控储因素
水动力条件
压实作用
reservoir physicalproperty
reservoirproperty
reservoir spacetype
reservoir-controlling factors
hy-drodynamic conditions
compaction
