环江油田L158区块长8_(1)^(2)段水下分流河道单砂体空间组合样式及其对剩余油分布的影响  

Spatial combination modes of single sandbodies in underwater distributary channels and its influence on distribution characteristics of remaining oil of Chang8_(1)^(2) in L158 Block,Huanjiang Oilfield

作　　者：刘庆海 王博涛[2] 阮金凤 阎娜[2] 朱玉双[1] LIU Qinghai;WANG Botao;RUAN Jinfeng;YAN Na;ZHU Yushuang(State Key Laboratory of Continental Dynamics,Northwest University,Xi’an City,Shaanxi Province,710069,China;Fifth Oil Production Plant of PetroChina Changqing Oilfield Company,Xi’an City,Shaanxi Province,710018,China)

机构地区：[1]西北大学大陆动力学国家重点实验室,陕西西安710069 [2]中国石油长庆油田分公司第五采油厂,陕西西安710018

出　　处：《油气地质与采收率》2022年第2期23-33,共11页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“碎屑岩输导层结构模型中成岩演化过程与流体流动特征”(2017ZX05008-004-004-001);国家自然科学基金项目“高热与超压背景的成岩响应及流体活动对储层成岩-孔隙演化的影响”(41972129)。

摘　　要：以野外剖面及岩心观察为基础,结合测井及生产动态资料,建立水下分流河道砂体垂向隔夹层识别标准与侧向单砂体边界划分准则,对鄂尔多斯盆地环江油田L158区块长8_(1)^(2)段水下分流河道单砂体进行划分,剖析单砂体空间叠置关系及占比,分析单砂体叠置与连通性的关系,明确剩余油分布。结果表明:环江油田L158区块长8_(1)^(2)段水下分流单河道宽度为230~450 m,单砂体厚度为4~10 m。单砂体叠置类型分为垂向上的分离式、垂接式和垂切式及侧向上的间湾接触、堤岸接触、对接接触和侧切接触;空间组合样式共10种且以分离侧切式和垂接侧切式为主。双向弱连通式砂体的上方砂体侧翼与下方砂体顶部剩余油富集;侧向弱连通式砂体的上方砂体侧翼剩余油富集而下方砂体剩余油不富集;强连通性砂体剩余油不富集。On the basis of the field sections’data and results of core observation,we established the identification standards of interlayers in the vertical direction for underwater distributary channel sandbodies and the division standards of the single sandbodies in the lateral direction with logging and performance data in the study area.Further,we identified the single sandbodies in underwater distributary channels in Chang8_(1)^(2) of L158 Block,Huanjiang Oilfield,Ordos Basin,analyzed the spatial superposition types of the single sandbodies and calculated their proportions.At last,we studied the influence of these superposition relationship modes on the connectivity among the sandbodies and expounded the distribution characteristics of the remaining oil.The results show that the widths of single river channels of Chang8_(1)^(2) in L158 Block,Huanjiang Oilfield are 230-450 m,and the thicknesses of the single sandbodies are 4-10 m.Seven superposition types are found from the single sandbodies,i.e.,three in the vertical direction(separated type,vertical contact type,and vertical cutting type)and four in the lateral direction(interdistributary contact type,embankment contact type,butt contact type,and side cutting contact type).There are 10 spatial combination modes,dominated by separated-side cutting and vertical contact-side cutting combinations.The remaining oil is enriched in the flanks of the upper single sandbodies and the tops of the lower single sandbodies of the two-way weakly connected sandbodies,and the flanks of the upper single sandbodies of the weakly connected sandbodies in the lateral direction,but it is not enriched in the lower single sandbodies of the weakly connected sandbodies in the lateral direction and the strongly connected sandbodies.

关 键 词：水下分流河道 单砂体划分 砂体叠置 剩余油 环江油田 

分 类 号：TE122.2[石油与天然气工程—油气勘探]