致密砂岩储层微观孔隙结构及其对储层物性的影响:以鄂尔多斯盆地黄陵地区长6段为例  

Micro-pore Structure of Tight Sandstone Reservoir and Influence onReservoir Physical Properties: Chang 6 Member of Huangling Area,Ordos Basin as an Example

作　　者：郭春芬[1] 李爱荣 樊万红[1] 杨兴[1] 侯宾东 刘梦 赵凯丽 GUO Chun-fen;LI Ai-rong;FAN Wan-hong;YANG Xing;HOU Bin-dong;LIU Meng;ZHAO Kai-li(Yanchang Oil Field Co.,Ltd.,Yan'an 716000,China;School of Earth Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]延长油田股份有限公司,延安716000 [2]西安石油大学地球科学与工程学院,西安710065

出　　处：《科学技术与工程》2024年第34期14623-14631,共9页Science Technology and Engineering

基　　金：国家自然科学基金(41772140)。

摘　　要：应用岩心、铸体薄片和孔隙图像、扫描电镜和高压压汞等资料,对鄂尔多斯盆地黄陵地区长6段致密砂岩储集空间和微观孔喉结构特征进行精细表征,并分析其对储层物性影响。研究表明残余粒间孔、长石溶孔、晶间孔以及微裂缝为该研究区储层的主要储集空间。长6段储层孔隙度平均值为7.46%,渗透率平均为0.32 mD;孔喉半径分布范围0.150~2.597μm,呈单峰和双峰态分布,主流喉道半径为0.148~0.760μm;在致密砂岩储层中,大孔喉对应孔隙对渗透率贡献占10%~30%,中小孔喉占17%~53%,这两者对储层渗透率起主要贡献,而纳米级孔喉占35%~67%,对渗透率基本没有贡献,但对孔隙度有贡献和影响。引起渗透率非均质性主要是大孔喉半径对应的孔隙,而引起孔隙度非均质性主要是小孔喉对应的孔隙;对于渗透率大于0.1 mD储层,孔喉半径大于0.5μm是引起渗透率非均质性的主要原因。The reservoir space and pore structure of Chang 6 Member tight sandstone in Huangling area of Ordos Basin were characterized by using core,thin slice and pore image,scanning electron microscope and high pressure mercury injection data,and their influence on reservoir properties was analyzed.The results show that residual intergranular pores,feldspar pores,intergranular pores and microfractures are the main reservoir spaces in this study area.The average porosity and permeability of Chang 6 Member are 7.46%and 0.32 mD respectively.The radius distribution range of pore throat was 0.150μm to 2.597μm,showing unimodal and bimodal distribution,and the radius of main throat was 0.148μm to 0.760μm.In tight sandstone reservoirs,large pore throat corresponding pore contributes 10%~30%to permeability,and that of medium and small pore throats accounted for 17%to 53%,which are the main contributions to the permeability of the reservoir,while the nano-pore throat accounts for 35%~67%,which basically has no contribution to the permeability,but has contribution and influence on the porosity.The permeability heterogeneity is mainly caused by the pores corresponding to the radius of the large pore throat,and the porosity heterogeneity is mainly caused by the pores corresponding to the small pore throat.For reservoirs with permeability greater than 0.1 mD,pore throat radius greater than 0.5μm is the main cause of permeability heterogeneity.

关 键 词：孔隙结构 储层物性 致密砂岩 延长组 长6段 

分 类 号：TE122.24[石油与天然气工程—油气勘探]