三角洲平原分流河道单砂体叠置特征及其对剩余油分布的影响——以瓦窑堡油田水晶沟区块长2油藏为例  

Characteristics of Single Sand Body Superimposition in Distributary Channels of Delta Plain and Their Influence on Distribution of Remaining Oil——A Case Study of Chang 2 Reservoir of Shuijinggou Block of Wayaopu Oilfield

作　　者：何俊昊 田正兰 杨哲恒 He Junhao;Tian Zhenglan;Yang Zheheng(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi'an Shaanxi 710065)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《中外能源》2023年第4期38-46,共9页Sino-Global Energy

摘　　要：以鄂尔多斯盆地瓦窑堡油田水井沟区块长2油藏为例,通过岩心观察、铸体薄片并结合钻井、测井和试油动态资料,对三角洲平原分流河道单砂体叠置特征展开了研究,明确了单砂体垂向叠置类型、侧向接触关系,定量分析了研究区单砂体空间组合类型及其占比,厘清了单砂体叠置特征对研究区剩余油分布的控制作用。结果表明:(1)研究区长2段为三角洲平原亚相沉积,以分流河道砂体为骨架砂体,三角洲平原分流河道单砂体厚度2~9m,宽度100~395m,平均宽厚比为44;(2)受沉积环境和物源供给影响,单砂体垂向上发育分离型、垂切型、垂叠型等三种叠置类型,侧向上存在侧切接触、侧叠接触、间湾接触和堤岸接触等四种接触关系;(3)不同单砂体空间组合类型砂体的连通性和剩余油分布规律存在差异,受夹层(泥质和钙质夹层)影响较大。Chang 2 reservoir in Shuijinggou Block of Wayaopu Oilfield in Ordos Basin is studied as a case.Through core observation,casting thin sections,and dynamic data of drilling,logging and oil test,the superposition characteristics of single sand bodies in distributary channel of delta plain are studied,and the vertical superposition type and lateral contact relationship of single sand bodies are clarified.The spatial combination type and proportion of single sand bodies in the study area are quantitatively analyzed,and the control effect of superposition characteristics of single sand bodies on the distribution of remaining oil in the study area is clarified.The results show that:(1)In Chang 2 Member of the study area,delta plain subfacies deposit was developed,and the distributary channel sand body is the skeleton one.The thickness of the single sand body of the distributary channel of delta plain is 2-9m,the width is 100-395m,and the average width-thickness ratio is 44.(2)Affected by sedimentary environment and provenance supply,three types of superposition was developed for the single sand body in the vertical direction:separation type,vertical cut type and vertical superposition type.There are four contact relationships in the lateral direction:side-cutting contact,lateral superposition contact,bay contact and embankment contact.(3)The connectivity of sand bodies and the distribution of remaining oil are different in different spatial combination types of single sand bodies,which are greatly affected by interlayers(argillaceous and calcareous interlayers).

关 键 词：瓦窑堡油田 长2 单砂体 砂体叠置 剩余油 

分 类 号：TE327[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]