吴起油田吴仓堡地区下组合致密储层特征及影响因素分析  

Tight reservoir of lower assemblage in Wucangbao area of Wuqi Oilfield analysis of characteristics and influencing factors

作　　者：杨水胜 白江[2] 陈刚[2] 刘大鹏 贠玉平 王天翔 周武 YANG Shuisheng;BAI Jiang;CHEN Gang;LIU Dapeng;YUN Yuping;WANG Tianxiang;ZHOU Wu(Exploration and Development Technology Research Center of Yanchang Oilfield Co.,Ltd.,Shaanxi Yan’an 716000,China;Wuqi Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Shaanxi Yan’an 716000,China)

机构地区：[1]延长油田股份有限公司勘探开发技术研究中心,陕西延安716000 [2]延长油田股份有限公司吴起采油厂,陕西延安716000

出　　处：《非常规油气》2025年第2期41-53,共13页Unconventional Oil & Gas

基　　金：延长油田股份有限公司项目“吴仓堡东部毛砭油区综合地质研究”(ycsy2021ky-C-05-01)。

摘　　要：为了进一步推进鄂尔多斯盆地吴仓堡地区延长组下组合致密油的勘探开发,基于目的层岩心观测取样和多种岩心实验分析手段,在分析储层岩石学、物性和孔隙结构特征的基础上,对储层物性影响因素进行了研究。结果表明:研究区下组合储层岩石类型以长石砂岩和岩屑长石砂岩为主,其中长10层的粒度相对较粗,中砂含量相对较高,其余各层以细-极细粒为主,储集空间以粒间孔为主。纵向上,长10层的物性最好,长7层次之,长9层和长8层相对较差。储层性能的差异主要受沉积和成岩因素影响,其中压实和胶结作用使储层致密化,而溶蚀和破裂作用不仅能改善储集空间,还能提高原有孔隙的连通性,提供运移通道。从储层物性与含油性关系来看,油层的物性整体优于水层和干层,油层平均孔隙度为8.32%,平均渗透率为0.38 mD。In order to further promote the exploration and development of tight oil in the lower assemblage of Yanchang Formation in Wucangbao area of Ordos Basin,the influence factors of reservoir physical properties were studied through the core observation of target reservoirs and core experimental analysis methods based on the analysis of reservoir petrology,physical properties and pore structure.The results show that the lower assemblage reservoirs in the study area are mainly feldspar sandstone and lithic feldspar sandstone.Among them,the grain sizes of Chang10 are relatively coarse,the content of medium sand is relatively high,the other layers are mainly fine-very fine grains,and the reservoir space is dominated by intergranular pores.Longitudinally,the physical property of Chang10 is the best;Chang7 follows,and Chang9 and Chang8 are relatively poor.The difference in reservoir properties is dominated by sedimentary and diagenetic,in which compaction and cementation make the reservoir tight.Dissolution and fracture improve the reservoir space and enhance the connectivity of the original pores,providing migration channels.According to the relationship between reservoir physical properties and oil-bearing properties,the physical properties of oil layers are better than those of water and dry layers;The average porosity of oil layers is 8.32%,and the average permeability is 0.38 mD.

关 键 词：延长组下组合 致密储层特征 控制因素 含油性 吴起油田 

分 类 号：TE122[石油与天然气工程—油气勘探]