鄂尔多斯盆地杏河地区长6油组不同微相储层孔隙结构特征  

Pore structure of Chang 6 reservoir group in different mi-crofacies reservoir at Xinghe area in Ordos basin

作　　者：孟宪富[1] 陈堂锁[2] 洛跃雄[2] 张金[2] 张遂[2] 付玉丽[3] 

机构地区：[1]油气资源与勘探技术教育部重点实验室.长江大学,湖北荆州434023 [2]中国石油长庆油田分公司采油一厂 [3]中国石化江汉油田分公司勘探开发研究院

出　　处：《石油地质与工程》2009年第4期20-22,共3页Petroleum Geology and Engineering

基　　金：国家自然科学基金项目(40602013);油气资源与勘探技术教育部重点实验室研究成果

摘　　要：安塞油田杏河地区长6油层组沉积期发育三角洲前缘亚相,储集岩为水下分流河道、河口砂坝及三角洲前缘席状砂等微相沉积体。储集岩主要由长石砂岩和岩屑长石砂岩组成,根据岩心铸体薄片、扫描电镜、图像分析、常规物性、压汞分析及测井资料进行研究表明,该地区各微相砂岩储集空间主要为次生孔隙和原生粒间孔;次生孔隙主要是沸石、长石溶孔,少量岩屑及杂基溶孔。储层孔喉特征均为小孔隙微喉道;物性特征为低孔隙、低渗透的基本特点;排驱压力和饱和度中值压力较高,孔喉半径小且分选性较差,溶蚀作用对改善喉道连通性的效果不佳,孔隙结构参数总体较差。储层物性水下分流河道砂体较好,河口砂坝次之,三角洲前缘席状砂第三。Chang 6 oil group at Xinghe area in Ordos basin prima-rily is at the deltaic front subfacies,and its reservoir rocks consist of the sandstones of underwater distributary chan-nels,distributary mouth bar,delta front sheet sand deposit.Reservoir rocks at Xinghe area in Ansai oilfield are mainly composed of arkose and lithic arkose.Form the data of core analysis,casting thin-section,scanning electron micro-scope,the normal physical properties analysis,mercury in-jection test and logging,it is revealed that the pore space of reservoir mainly includes the primary residual intergranular pores and the secondary pores,of which the secondary pores in most parts are zeolite and feldspar-dissolved pores with a small amount as lithic-dissolved pores,so the sandstone reservoir is characterized by low permeability and porosity,high displacement and saturation median point pressure,small pore throat radius,poor pores throat sorting.Dissolu-tion for pore throat connectedness does not improve obvious-ly,so the pore structure parameters are poor in accumulation properties.The sandbodies of underwater distributary chan-nels sedimentary microfacies deposit are the main reservoir at Chang 6 area,and the distributary mouth bar sedimentary microfacies are next,and delta front sheet sand sedimentary microfacies the third.

关 键 词：鄂尔多斯盆地 杏河 长6油组 孔隙特征 

分 类 号：TE112.23[石油与天然气工程—油气勘探]