松辽盆地大安油田纳米级孔隙研究

Study on nanopore throat in Da′an Oilfield, Songliao Basin

张月¹ 文慧俭¹ 白东来¹ 马世忠¹ 李跃¹ 王琦¹ 秦旗¹ 王海鹏²

东北石油大学地球科学学院，黑龙江 大庆 163318 中国有色金属长沙勘察设计研究院有限公司重庆分公司，重庆 410000

College of Geosciences, Northeast Petroleum University, Daqing 163318, China Chongqing Branch, Chinese Nonferrous Metal Survey and Design Institute of Changsha Co. Ltd. , Chongqing 410000, China

松辽盆地大安油田泉四段扶余油层为近期的接替储层，文中以此层位为研究对象，重点研究该层段储层微观孔喉特征，致密砂岩储层纳米级孔隙类型、大小、形态特征，单矿物表面面孔率及纳米级孔隙孔径分布特征。结果表明：泉四段扶余油层储层孔隙结构差，致密砂岩发育； 该区存在3种类型纳米级孔隙，即矿物晶间纳米级孔隙、颗粒内纳米级孔隙及微裂缝，且该区纳米级孔隙形态特征多样； 该区发育的主要矿物有石英和长石，对其进行单矿物表面纳米级孔隙面孔率分析，得知其面孔率平均值分别为0.36%和1.90%； 3块致密样品氮气等温吸附实验孔径分布表明，纳米级孔隙孔径分布与储层物性呈负相关。该区纳米级孔隙的发现对松辽盆地非常规油气勘探开发及增储具有重要意义。

Being the potential reservoir, K1q4, Fuyu oil layer of Da′an oil reservoir in Songliao Basin, research has focused on micro pore structure, the type, size and form of tight sandstone reservoir, also, the surface porosity of the mineral and pore size distribution of nanopore. The results show that: the pore structure of reservoir is poor and tight sandstone is developmental; three types of nanopore: mineral intragranular pore, grain micropore, microfracture are first found, twelve forms developed in this area; quartz and feldspar are the main mineral, the surface porosities are 0.36% and 1.9% respectively; three samples measured by nitrogen adsorption show that pore size distribution of nanopore correlated with physical property negatively. Thus, the discovery of nanopore is very important for the exploration and development of unconventional petroleum and increasing the potential of resources.

10.6056/dkyqt201504007