苏北盆地曲塘次凹阜宁组三段储层特征及主控因素  

Reservoir characteristic and main control factors of the 3rd member of Funing Formation in Qutang Sub-sag,Subei Basin

作　　者：仲米剑 刘喜杰 万欢 刘玉明 逄建东 郭清正 石雪峰 葛岩 ZHONG Mijian;LIU Xijie;WAN Huan;LIU Yuming;PANG Jiandong;GUO Qingzheng;SHI Xuefeng;GE Yan(Energy Technology Branch of Drilling and Production Company,CNOOC,Tianjin 300452,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《东北石油大学学报》2022年第1期36-46,I0003,I0004,共13页Journal of Northeast Petroleum University

基　　金：中海油能源发展股份有限公司海油发展科研项目(HFKJ-CGXM-GJ2020-02)。

摘　　要：曲塘次凹阜宁组三段(阜三段)是苏北盆地海安凹陷增储上产的重要储层。利用粒度分析、X线衍射、铸体薄片、压汞实验等方法,结合测井资料、沉积类型、孔隙结构、成岩演化等,研究优质储层形成的主要控制因素,提出适合研究区生产实际的储层分类评价标准,并对储层进行综合评价。结果表明:阜三段储层为中孔、超低—特低渗储层;孔隙类型主要为粒间孔、粒内溶蚀孔隙、颗粒溶蚀孔隙;喉道对储层渗流能力控制明显,当0.400μm<孔喉半径<1.000μm时,对渗透率的贡献最大;平均孔喉半径、排驱压力、相对分选因数可作为储层分类评价的参考依据。阜三段处于中成岩阶段A期,原始孔隙度保存较少,胶结作用较强且微孔率较高,是储层物性降低的主要因素;溶蚀作用对储层的物性具有明显的改善作用,是优质储层形成的重要因素。储层主控因素表现为受沉积相带及成岩作用控制,坝砂的储集物性及含油性相对优越于滩砂的。曲塘次凹阜三段储层可划分为4类,其中Ⅰ、Ⅱ类储层处于坝砂沉积相带,物性较好,孔隙度大于16.00%,渗透率大于0.40×10^(-3)μ ^(2),孔隙结构条件相对优越,平均孔喉半径大于0.100μm,排驱压力小于1.50 MPa,粒间孔、粒内溶蚀孔隙较为发育,是研究区优质储层和主要勘探目标。该结果对研究区下一步勘探部署具有参考意义。The 3rd member of Funing Formation in Qutang Sub-sag is the important reservoir for increasing reserves and production of Haian Sag,Subei Basin.We summarized the main control factors of high quality reservoir and put forward the classification evaluation standard suitable for production on the basis of particle size,X ray,casting thin section and mercury injection combing with well log,sedimentary and pore structure in diagenetic evolution.The results show that the reservoir property of the 3rd member of Funing Formation is mesoporous ultra-low permeability,the type of pore is mainly corrosion in intragranular and intergranular.The seepage capacity is controlled by pore throat and radius between 0.400 and 1.000μm give a very positive contribution to the permeability.The average pore-throat radius,expulsion pressure and relative separation coefficient can be the reference for reservoir evaluate classification.The 3rd member of Funing Formation is in mid-diagenetic period stage A with less original porous and intensive cementation for the reason of decreasing the property and the dissolution is improving on the other hand.The reservoir is mainly controlled by facies belt and diagenesis for the bar is better than beach from property to oiliness.The reservoir is classified into 4 types in which typesⅠandⅡare in bar with porosity of more than 16.00%and permeability is more than 0.40×10^(-3)μ ^(2).The pore structure is relative advantageous with average pore-throat radius is more than 0.100μm and expulsion pressure is less than 1.50 MPa.The erosional pore of intragranular and intergranular is development.Reservoir typesⅠandⅡare the exploration target for the next step as the sweet point.The result is significant for the next exploration deployment of the research area.

关 键 词：孔隙结构 成岩作用 成岩演化 储层评价 阜三段 曲塘次凹 苏北盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]