鄂尔多斯盆地东缘临兴地区盒8段储层微观孔隙结构及渗流特征  

Microscopic Pore Structure and the Seepage Characteristics in Tight Sandstone Reservoir of the 8th Member of Lower Shihezi Formation in Linxing Area of East Ordos Basin

作　　者：王赞惟[1] Wang Zanwei(China United Coalbed Methane Co.,Ltd.,Beijing 100018,China)

机构地区：[1]中联煤层气有限责任公司,北京100018

出　　处：《非常规油气》2020年第1期59-64,共6页Unconventional Oil & Gas

基　　金：国家科技重大专项资助项目“煤层气/页岩气/致密砂岩气共采先导性试验研究”(2016ZX0566)资助。

摘　　要：临兴地区盒8段储层属于陆相河道沉积,是该地区的主力气层之一。为了达到高效开发,解决在生产过程中出现的后期产水量较大、井筒积液严重等问题,本文通过铸体薄片、扫描电镜、核磁共振T 2谱、高压压汞等方法,研究临兴地区盒8段储层微观孔隙结构和渗流特征。研究认为:①盒8段砂岩储层束缚水饱和度为55.88%,含水饱和度为60.60%,等渗点相对渗透率值平均为0.034 mD,气相相对渗透率随着含水饱和度增加而快速下降。②盒8层气相渗透率对含水饱和度的敏感程度较高,容易受到水相圈闭伤害。该研究对在气井生产过程中避免气井水锁、加强排水采气措施具有指导意义。Reservoir is mainly composed in the 8th member of the lower Shihezi in Linxing area.In order to solve the problems that output of liquid decreased gas production greatly,based on the experimental data such as casting thin section,scanning electron microscope and constant rate mercury injection,NMR of reservoir were analyzed,to research microscopic pore structure characteristics,movable fluid on development effects of low permeability reservoir.The study shows that:①The irreducible water saturation is 55.88%,water saturation is 60.60%,the relative permeability value of the isotonic point is 0.034 mD,the relative permeability of the gas phase decreases rapidly with the increase of water saturation.②Gas phase permeability of reservoirs is sensitive to water saturation and is vulnerable to aqueous phase trapping-damage.The study is of guiding significance to avoid water blocking damage and strengthen drainage measures in gas well production.

关 键 词：微观孔隙结构 可动流体 致密砂岩 

分 类 号：P618.11[天文地球—矿床学]