鄂北S井区盒8上亚段砂体叠置类型及其对气藏分布的影响  

Superposition types of sand bodies in the upper section of He 8 in S well area of northern Ordos Basin and its influence on gas reservoir distribution

作　　者：杜家满 赵永刚 申荣荣[1,2] 于明航 阴旭航 DU Jiaman;ZHAO Yonggang;SHEN Rongrong;YU Minghang;YIN Xuhang(School of Geosciences and Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Shaanxi Provincial Key Laboratory of Petroleum Accumulation Geology,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院 [2]西安石油大学陕西省油气成藏地质学重点实验室

出　　处：《录井工程》2024年第1期119-126,共8页Mud Logging Engineering

基　　金：国家自然科学基金项目“泥质纹层对致密砂岩油藏中构造缝垂向扩展的抑制机理”(编号:42002176);中国石油天然气股份有限公司长庆油田分公司项目“苏东41⁃33区块剩余储量评价及稳产对策研究”(编号:2022⁃12699)。

摘　　要：为明确鄂北S井区盒8上亚段地层砂体叠置类型及其与气藏分布的关系,通过岩心观察、测井解释等方法对研究区盒8上亚段沉积微相类型、砂体的垂向叠置及侧向接触关系进行深入研究,再结合试气资料探讨不同砂体叠置类型的气藏分布特征。结果表明:鄂北S井区盒8上亚段为曲流河三角洲平原亚相,有利砂体对应的沉积微相类型为边滩与河道充填微相;砂体垂向叠置类型可划分为分离式、叠加式、切叠式、替代式,侧向接触关系可划分为间湾接触、堤岸接触、对接式、侧切式、替代式;鄂北S井区盒8上亚段砂体垂向叠置类型主要为侧向切叠式和替代式,增加了砂体在侧向上的连通性;盒8上亚段砂体侧向接触关系主要为侧切式,提升了砂体侧向上的连通程度,气藏储存关系较好;单一、孤立存在的砂体,其连通性较差,整体的含气性也较差。该研究对寻找低渗透背景下产能高、潜力大的砂体分布区具有重要指导意义。In order to clarify the relationship between sand body superposition types and gas reservoir distribution in upper member of He 8 in S well area of northern Ordos Basin,the sedimentary microfacies types,vertical superposition and transverse contact relations of sand bodies in upper member of He 8 in the study area were studied by core observation and logging interpretation,and the gas reservoir distribution characteristics of different sand body superposition types were discussed combined with gas test data.The results show that the upper section of He 8 in S well area of northern Ordos Basin is meander river delta plain subfacies,and the sedimentary microfacies corresponding to the favorable sand bodies are the microfacies filled by the edge beach and the channel.Sand body vertical superposition types can be divided into separate,superposition,cut superposition and substitute,lateral contact modes can be divided into bay contact,bank contact,butt type,side cutting type and substitute type.The vertical superposition types of sand bodies in the upper section of He 8 in the S well area of northern Ordos Basin are mainly lateral shear superposition and substitution,which increases the lateral connectivity of sand bodies.The transverse contact relationship of the sand body in the upper section of He 8 is mainly lateral,which improves the lateral connectivity of the sand body,and the gas reservoir storage relationship is good.The single and isolated sand body has poor connectivity and the overall gas bearing is also poor.The study has important guiding significance for finding sand body distribution areas with high productivity and great potential under the background of low permeability.

关 键 词：鄂北S井区 盒8上亚段 砂体垂向叠置 砂体侧向接触 气藏分布 

分 类 号：TE132.1[石油与天然气工程—油气勘探]