鄂尔多斯盆地上古生界致密砂岩气藏储层特征及控制因素——以苏里格气田桃2区块为例  

Reservoir Characteristics and Controlling Factors on Upper Paleozoic Tight Sandstone Gas Reservoir in Ordos Basin ——By Taking Block Tao 2 in Sulige Gasfield for Example

作　　者：马志欣[1] 张吉[1] 孙卫锋[1] 赵忠军[1] 孙艳辉[1] 朱亚军[1] 张志刚[1] 刘艳侠[1] 郝骞[1] 

机构地区：[1]中石油长庆油田分公司苏里格气田研究中心低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《石油天然气学报》2014年第9期16-21,3,共6页Journal of Oil and Gas Technology

摘　　要：结合镜下薄片鉴定、扫描电镜、压汞曲线、岩心分析化验等资料对鄂尔多斯盆地上古生界致密砂岩气藏储层特征进行了深入研究。结果表明,研究区储层岩石类型以岩屑砂岩和岩屑石英砂岩为主;孔隙类型以次生粒间孔、粒内溶孔为主,晶间孔和填隙物内溶孔次之;孔隙度平均为8.6%,渗透率平均为0.62mD,总体表现出低孔、低渗的特征。储层发育受沉积作用、成岩作用、构造作用等因素共同影响,其中沉积作用是基础,不仅决定了储层岩石的原始组分和结构,控制储层宏观分布,而且影响后期的成岩作用;成岩作用是关键,影响储集空间的保存、演化和发展,并最终决定了储层物性的好坏;构造作用形成裂缝,对改善储层渗透性起到了积极的作用。In combination with the data of thin slice analysis,scanning electron microscopy,mercury intrusion curve and core analysis,the characteristics of tight sandstone reservoirs in the upper Paleozoic of Ordos Basin were deeply studied.The results show that the reservoirs in the studied area are mainly of lithic sandstone and lithic quartz sandstone.The main pore types are secondary intergranular pores and intragranular dissolved pore,intercrystalline pore and dissolved holes within the interstitial material are next.Coring data show that the average porosity is 8.6%and the average permeability is 0.62 mD.The reservoirs generally present the characteristics of low porosity and low permeability.The main controlling factors on the reservoir development are sedimentation,diagenesis and tectonic process.The sedimentation is the foundation,it not only determines the original composition and structure of the reservoir rocks and controls the reservoir distribution,but also affects the reservoir diagenesis at the late stage.The diagenesis is the key factor affecting the preservation of reservoir space,evolution and development,and ultimately it determines the quality of reservoir properties.Tectonics create cracks for the improvement of reservoir permeability.

关 键 词：苏里格气田 桃2区块 储层特征 成岩作用 

分 类 号：P618.13[天文地球—矿床学]