奈曼凹陷东部斜坡带下白垩统九佛堂组下段储层特征  

Reservoir characteristics of lower Jiufotang Formation of lower Cretaceous in the eastern slope zone of Naiman Sag

作　　者：刘海艳[1] 冉波[1] 裴家学[1] 周铁锁[1] 郝亮[1] 李德华 LIU Haiyan;RAN Bo;PEI Jiaxue;ZHOU Tiesuo;HAO Liang;LI Dehua(Exploration&Development Research Institute of Liaohe Oilfield Company,PetroChina,Panjin,Liaoning 124010,China;Gas Storage Co.,Ltd.,Liaohe Oilfield Company,PetroChina,Panjin,Liaoning 124010,China)

机构地区：[1]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010 [2]中国石油辽河油田分公司储气库有限公司,辽宁盘锦124010

出　　处：《石油地质与工程》2023年第1期43-49,共7页Petroleum Geology and Engineering

基　　金：中国石油重大科技专项“辽河探区可持续规模增储勘探关键技术研究”(2017E-1601)。

摘　　要：通过岩石薄片鉴定、储层物性和孔隙结构特征分析,对奈曼凹陷东部斜坡带下白垩统九佛堂组下段储层特征进行研究。结果表明:九佛堂组下段储层岩石类型主要为不等粒岩屑砂岩、中-粗粒岩屑砂岩、中-细粒岩屑砂岩、碳酸盐质含泥粉砂岩等。储集空间以残余原生粒间孔、次生粒间溶孔、粒内溶孔为主,还有部分铸模孔、微裂缝、成岩缝等;平均孔隙度为14.13%,平均渗透率为13.42×10^(-3)μm^(2),喉道分选程度差,最大孔喉半径主要分布在0.04~55.93μm,孔隙结构为中-低孔、低渗-特低渗、细喉-特细喉不均匀型。平面上,主要受沉积相带控制,辫状河三角洲前缘水下分流河道砂岩储层物性好,前缘席状砂储层物性中等;纵向上,受成岩作用影响,1 000~1 900 m范围内产生了3个次生溶蚀孔隙发育段,在一定程度上改善了储集性能。The reservoir characteristics of lower Jiufotang Formation of lower Cretaceous in the eastern slope belt of Naiman sag are studied through rock thin section identification, reservoir physical properties and pore structure characteristics analysis.The results show that the reservoir rock types of lower Jiufotang Formation are mainly unequal grain lithic sandstone, medium coarse grain lithic sandstone, medium fine grain lithic sandstone, carbonate argillaceous siltstone, etc.The reservoir space is mainly composed of residual primary intergranular pores, secondary intergranular dissolved pores, intragranular dissolved pores, and some mold holes, micro fractures, diagenetic fractures, etc.The average porosity and permeability are 14.13% and 13.42×10^(-3)μm^(2) respectively.The throat sorting degree is poor, and the maximum pore throat radius is mainly distributed in 0.04~55.93 μ m.The pore structure is of medium-low porosity, low-ultra low permeability, and fine-ultra fine throat uneven type.In plane, it is mainly controlled by sedimentary facies belt.The underwater distributary channel sandstone reservoir in braided river delta front has good physical properties, while the front sheet sand reservoir has general physical properties.Vertically, due to diagenesis, three secondary dissolution pore development sections were formed within 1 000~1 900 m, which improved the reservoir performance to a certain extent.

关 键 词：奈曼凹陷 九佛堂组下段 沉积作用 孔隙结构 储层特征 

分 类 号：TE112.23[石油与天然气工程—油气勘探]