摘要
特低渗气藏的有效开发难度大,“甜点”预测及开发井位设计是低渗气藏有效开发的关键。使用梯度-90°相移技术对特低渗储集层进行了精细刻画,得到了砂体厚度图;在此基础上,通过微观和测井资料分析,明确“甜点”发育的类型及成因。在“甜点”发育模式的指导下,采用梯度波谷和属性定性识别孔隙型“甜点”发育区,采用最大似然属性和裂缝密度识别裂缝型“甜点”发育区。研究区H4层主要发育孔隙型“甜点”,平面上位于研究区北部和东部,纵向上位于H4b2和H4b3小层。H5层发育裂缝型和孔隙型“甜点”,平面上位于研究区南部,纵向上位于H5a3和H5a4小层。孔隙型“甜点”分布受控于有利沉积相带区,裂缝型“甜点”主要发育在靠近断裂附近和翼部构造强挤压区。基于“甜点”刻画结果,部署2口多底井,试验井大斜度段位于H5a层,水平段分支部署在H4b层,兼顾H4和H5“甜点”,实现特低渗气藏的有效开发。本研究方法对深层发育薄“甜点”的特低渗气藏“甜点”预测和开发方案编制具有参考意义。
The development of extra-low permeability gas reservoirs is difficult,and"sweet spot"prediction and well location design are the key to the effective development of low-permeability gas reservoirs.First,ultra-low permeability reservoir was finely characterized and the thickness of sand body was predicted using the gradient-90°phase shift of seismic data,and the types and causes of"sweet spot"development were identified through microscopic and logging data analysis.The gradient troughs and the attributes were identified qualitatively,and the maximum likelihood attribute and fracture density were used to identify the fracture type"sweet spot"devel-opment area,such as those in the H4 layer in the northern and eastern parts of the study area in horizontal direc-tion,and H4b2 and H4b3 sublayers in the vertical direction,while in the H5 layer developed fissure type and pore type"sweet spots"in the southern part of the study area on the plane and in the H5a3 and H5a4 sublayers in the vertical.The distribution of pore type"sweet spots"is controlled by favorable sedimentary facies zones,while fracture type"sweet spots"mainly develop near faults and the wing areas of strong compression zones.Based on the characterization of"sweet spots",two multi-bottom test wells were deployed in the H5a and the H4b layers,and achieved effective development of ultra-low permeability gas reservoirs.This study provided a reference for prediction of"sweet spots"in deep ultra-low permeability gas reservoirs and development plans.
作者
娄敏
段冬平
何贤科
李文俊
汪文基
李炳颖
荣乘锐
刘彬彬
LOU Min;DUAN Dongping;HE Xianke;LI Wenjun;WANG Wenji;LI Bingying;RONG Chengrui;LIU Binbin(Shanghai Branch of CNOOC(China)Ltd.,Shanghai 200335,China)
出处
《海洋地质前沿》
北大核心
2025年第1期57-69,共13页
Marine Geology Frontiers
基金
国家自然科学基金“东海深层低渗-致密气储层体系质量差异性成因机制及演化模式”(U19B2006)
中海石油(中国)有限公司重大科技项目“东海低渗大气田高效开发关键技术研究与示范应用”(KJZX-2024-0102)。
关键词
特低渗气藏
“甜点”预测
高效井型设计
有效开发
extra-low permeability gas reservoir
"sweet spot"prediction
efficient well design
gas reservoir de-velopment
