松辽盆地北部扶余油层致密油地质特征及勘探潜力  

Geological characteristics and exploration potential of the tight oil in Fuyu oil reservoirs of North Songliao Basin

作　　者：林铁锋[1] 康德江[1] 姜丽娜[1] LIN Tiefeng;KANG Dejiang;JIANG Lina(Exploration and Development Research Institute of Daqing Oilfield Co Ltd,Daqing 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院

出　　处：《大庆石油地质与开发》2019年第5期94-100,共7页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司“十三五”科技攻关项目“松辽盆地北部石油精细勘探技术完善与规模增储”(2016E-01)

摘　　要：为了进一步明确松辽盆地北部源下致密油地质特征及剩余资源分布,采用岩心实验数据、钻井资料及岩心三维CT扫描数据综合分析方法,对扶余油层致密油地质条件进行综合分析。结果表明:扶余油层烃源岩是上覆青山口组一段暗色泥岩,R o一般大于0.75%,排烃强度超过4×10^6t/km^2,储层具有砂体层数多、连续性差、纵向叠置、单层厚度薄等特点;孔喉以微纳米级为主,孔隙直径主要为3~8μm,喉道直径主要为1~3μm,随着孔隙度的增大,孔隙和喉道的数量、直径、连通体积空间均有所增大;扶余油层致密油藏主要是近距离的源下聚集油藏,无统一油水界面,多形成“甜点区”富集;松辽盆地北部长垣南及三肇凹陷中心区储层埋藏相对较深,物性较差,孔隙度普遍小于12%,为典型的致密砂岩储层,勘探潜力大。In order to further clarify the geological characteristics and the distribution of remained resources of tight oil in the north of Songliao Basin,the geological conditions of the tight oil in Fuyu oil reservoirs were comprehensively analyzed by the methods of the comprehensive analysis of the core experimental data,drilling data and 3D CT scanning data.The results show that the source rocks of Fuyu oil reservoirs are dark mudstone of the first member of the overlying Qingshankou Formation,with the maturity(R o)generally greater than 0.75%,the hydrocarbon expulsion intensity over 4×10^6t/km^2,many sandbody reservoirs,poor continuity,vertical overlap,thin single-layer thickness,etc;the pore throat is mainly of micro-nanometer scale,and the pore diameter is mainly 3-8μm.The throat channel diameter is mainly 1-3μm.With the increase of the porosity,the number,size and connected volume space of the pore and throat channel increase as well.The comprehensive analysis shows that Fuyu tight oil reservoirs are mainly under-source accumulated reservoirs with no uniform oil-water interface,thus many“sweet spots”are prone to enrich;the reservoirs in South Placanticline of North Songliao Basin and the central area of Sanzhao Sag are relatively deep,their physical properties are generally poor—the porosity is generally less than 12%,which are typical tight sandstone reservoirs with great exploration potential.

关 键 词：扶余油层 致密油 地质特征 储层微观孔喉特征 油藏特征 勘探潜力 

分 类 号：TE122.1[石油与天然气工程—油气勘探]