中坝气田须二气藏致密砂岩储层特征及开发潜力再认识  

Recognition of tight sandstone reservoir characteristics and development potential of the 2nd member of Xujiahe gas reservoir in Zhongba Gas Field

作　　者：张本健 王兴志[1] 张楚越[2] 王旭丽 桑琴 ZHANG Benjian;WANG Xingzhi;ZHANG Chuyue;WANG Xuli;SANG Qin(College of Geosciences and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Northwest Sichuan Gas Mine of Southwest Oilfield,Southwest Oil and Gas Field Company,PetroChina,Jiangyou,Sichuan 621709,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]中国石油西南油气田公司川西北气矿,四川江油621709

出　　处：《油气藏评价与开发》2019年第6期10-15,共6页Petroleum Reservoir Evaluation and Development

摘　　要：中坝气田致密砂岩气藏受构造、裂缝因素控制,属于裂缝—孔隙型气藏。在分析储层基本特征的基础上,重点探讨了裂缝的控制因素,旨在弄清裂缝分布对储层的影响,预测剩余气分布区域。储层岩性致密时,以浅灰—灰色细—中粒岩屑长石石英砂岩为主。岩心分析孔隙度、渗透率平均分别约为6.29%、0.19×10^-3μm^2,属于低孔—低—特低渗储层,裂缝和次生溶孔是储层发育的关键。基于此,采用构造曲率法以及岩石力学实验两种方法对裂缝展开了研究,结果表明:面上裂缝主要沿构造轴线发育,并靠近东南翼弧突及北鞍部的枢纽带,岩性与裂缝关系密切。结合气藏数值模拟结果,对气藏开发潜力进行了分析,为下一步开发调整方案提供了一定的依据。The tight-sandstone gas reservoir in Zhongba gas field is a fracture-pore type reservoir controlled by structures and fractures.On the basis of analyzing the basic characteristics of reservoirs,the factors controlling the fractures are discussed to figure out the effect of fractures distribution on the formations and predict the distribution of residual gas.The reservoir is mainly composed of light gray-gray fine-medium lithic feldspar quartz sandstone with its average porosity and permeability being 6.29%and 0.19×10^-3μm^2,respectively.It belongs to low porosity and permeability formations.And based on this,the fracture was studied by means of tectonic curvature method and rock mechanics experiment.The results showed that the fractures on the surface were mainly developed along the structural axis and close to the southeast arc and the northern conjunction of the saddle.The developments of fractures were tightly related with lithology.Combined with the numerical simulation results of gas reservoir,the potentials of the gas reservoir are analyzed to support the scheme adjustment in the next stage of development.

关 键 词：致密砂岩 裂缝—孔隙型 裂缝分布 构造曲率法 岩石力学 开发潜力 

分 类 号：TE122[石油与天然气工程—油气勘探]