摘要
针对A油田沙三下段混积岩不同类别储层特征认识不清的问题,利用钻测井、分析化验资料及开发井投产数据,对研究区混积岩储层特征进行了综合研究,并引入开发井产能评价指数,对储层进行分类评价。结果表明:1)研究区沙三下段同时发育三角洲沉积体系和滨浅湖混积滩坝沉积体系。2)储集岩类型主要为灰质砂岩、云质砂岩、砂质灰岩和砂质云岩。3)储集空间类型以粒间孔为主,同时发育溶蚀孔和裂缝;储层平均孔隙度为25.4%,平均渗透率为55.1 mD。4)以渗透率、电阻率和碳酸盐含量3个测井参数加权的混积岩储层产能评价指数与开发井初期产能相关性好。产能评价指数大于20,单井初期产能大于110 m^(3)/d;产能评价指数为6~20,单井初期产能为40~70 m^(3)/d;产能评价指数小于6,单井初期产能小于20 m^(3)/d。5)可将储层划分为3类,Ⅰ类储层为中高孔、中高渗储层,主要分布在混合滩坝相的云质混积区,Ⅱ类储层为中孔、中低渗储层,主要分布在混合滩坝相的灰质混积区,Ⅲ类储层为中低孔、低渗储层,主要分布在混合滩坝相的泥质混积区。
Due to an unclear understanding of the characteristics of different types of diamictite reservoirs in the Lower Submember of the 3^(rd) Member of the Econe Shahejie Formation(Es^(L)_(3))in A Oilfield,the characteristics of diamictite reservoirs were comprehensively studied with data from drilling,logging,laboratory and production of development wells in the study area,and the productivity evaluation index of development wells was introduced to classify and evaluate the reservoirs.The results showed that:1)The delta sedimentary system and the shore-shallow lake mixed beach-bar sedimentary system are developed in Es^(L)_(3) in the study area.2)The types of reservoir rocks are mainly calcareous sandstone,dolomitic sandstone,sandy limestone,and sandy dolomite.3)Most reservoir spaces are intergranular pores,dissolution pores and fractures are developed,the average porosity of the reservoir is 25.4%,and the average permeability is 55.1 mD.4)The productivity evaluation index of diamictite reservoirs weighted by three logging parameters of permeability,resistivity and carbonate content has a good correlation with the initial productivity of development wells.The initial productivity of a single well is greater than 110 m^(3)/d when the productivity evaluation index is greater than 20.The initial productivity of a single well ranges from 40 to 70 m^(3)/d when the productivity evaluation index is between 6 and 20.The initial productivity of a single well is less than 20 m^(3)/d when the productivity evaluation index is less than 6.5)The reservoir can be divided into three categories:type I reservoirs with medium-high porosity and medium-high permeability are mainly distributed in the mixed dolomitic area of mixed beach-bar facies;type II reservoirs with medium porosity and medium-low permeability are mainly distributed in the mixed dolomitic area of mixed beach-bar facies;type III reservoirs with medium-low porosity and low permeability reservoirs are mainly distributed in the mixed argillaceous area of mixed beach-bar facies.
作者
张红臣
穆朋飞
张立安
李桂仔
王海涛
ZHANG Hongchen;MU Pengfei;ZHANG Li’an;LI Guizai;WANG Haitao(CNOOC Energy Technology Drilling&Production Company,Tianjin 300452,China;Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)
出处
《非常规油气》
2024年第5期28-36,共9页
Unconventional Oil & Gas
基金
国家科技重大专项“大型油气田及煤层开发-近海大中型油气田形成条件及勘探技术(三期)——渤海海域勘探新领域及关键技术研究”(2016ZX05025-003)。
关键词
储层特征
分类评价
混积岩
沙三下段
reservoir characteristic
classification evaluation
diamictite
Es^(L)_(3)
