宁夏盐池地区延长组长A段超低渗Ⅲ类油藏储层评价  

Evaluation of ultra-low permeability classⅢreservoir in Chang A member of Yanchang formation in Yanchi area,Ningxia

作　　者：苏幽雅[1] 刘春林[1] 张永平[1] 杨申谷 SU Youya;LIU Chunlin;ZHANG Yongping;YANG Shengu(Oil Production Plant 3 of PetroChina Changqing Oilfield Company,Yinchuan Ningxia 750006,China)

机构地区：[1]中国石油长庆油田分公司第三采油厂,宁夏银川750006

出　　处：《石油化工应用》2022年第10期93-96,共4页Petrochemical Industry Application

摘　　要：宁夏盐池地区长A段储层砂岩表现为低孔、特低渗特征。储层岩心孔隙度7.52%,渗透率0.14 mD,孔隙结构以小孔微细-微喉道为主,为典型超低渗Ⅲ类油藏。长A段油藏未动用剩余储量丰富,该区长A油藏剩余未动用储量5928×104t。长A段油藏具有多层系复合连片成藏,纵向叠合的特征,但储层物性差、层内非均质性强,定向井开发普遍低产,大斜度井递减较大等问题。本文重点开展长A段储层岩石学特征、成岩岩相、储层物性特征、油层段含水下限、储层综合评价、油藏圈闭及甜点分类储量等研究,为下步寻找规模效益建产区提供资源保障。The reservoir sandstone of Chang A member in Yanchi area of Ningxia is characterized by low porosity and ultra-low permeability.The core porosity of the reservoir is 7.52%and the permeability is 0.14 mD.The pore structure is mainly small pores and micro throats.It is a typical ultra-low permeability classⅢreservoir.The remaining undeveloped reserves of Chang A reservoir are rich,and the remaining undeveloped reserves of Chang A reservoir in this area are 5928×10^(4)t.Chang A reservoir has the characteristics of multi-layer composite and contiguous reservoir formation and vertical superposition,but there are problems such as poor reservoir physical properties,strong intraformational heterogeneity,low production in directional well development,and large decline in highly deviated wells.This paper focuses on the study of reservoir petrological characteristics, diagenetic facies, reservoir physical properties, lower water cut limit of oil layers, comprehensive evaluation of reservoirs, reservoir traps and dessert classified reserves of Chang A member, so as to provide resource guarantee for the next step to find scale benefit production areas.

关 键 词：超低渗Ⅲ类油藏 储层综合评价 甜点储量 

分 类 号：TE122.24[石油与天然气工程—油气勘探]