陇东地区长82砂体结构特征及成因模式  

Sandbody structural characteristics and genetic model of Chang 82 in Longdong area

作　　者：马瑶 史涛 王冠男 吴越 李文厚[5] MA Yao;SHI Tao;WANG Guannan;WU Yue;LI Wenhou(School of Earth Sciences and Engineering/Key Laboratory of Shaanxi Province For Oil and Gas Accumulation Geology,Xi′an Shiyou University,Xi′an 710065,China;Department of Development,Tarim Oilfield Company,CNPC,Korla 841000,China;Research Institute of Shaanxi Yanchang Petroleum(group)Co.,Ltd.,Xi′an 710065,China;The Eleventh Oil Production Plant,Changqing Oilfield Company,PetroChina,Qingyang 745000,China;State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi′an 710069,China)

机构地区：[1]西安石油大学地球科学与工程学院/陕西省油气成藏地质学重点实验室,陕西西安710065 [2]中国石油塔里木油田公司开发处,新疆库尔勒841000 [3]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [4]长庆油田分公司第十一采油厂,甘肃庆阳745000 [5]西北大学地质学系/大陆动力学国家重点实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2019年第5期765-771,共7页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学青年基金资助项目(41702117);国家自然科学重点基金资助项目(41330315);国家科技重大专项专题基金项目(2017ZX05005-002-004);陕西省自然科学基础研究青年项目(2017JQ4018)

摘　　要：利用岩心、测井等资料,在沉积环境和水动力分析研究的基础上,对陇东地区延长组长82小层的砂体类型、砂体结构特征进行分析,总结砂体结构成因模式。结果表明,长82小层发育3类砂体,分别为水下分流河道砂体、席状砂以及滩砂;构成4类砂体结构,分别为正常水道型、叠加水道型、改造水道型和孤立砂体型。平面上,西南部辫状河三角洲前缘主力砂体呈条带状展布,浅湖线附近主力砂体沿浅湖线一带呈坨状、片状分布。剖面上,辫状河三角洲前缘砂体连通性整体较好,砂体结构类型以叠加水道型及正常水道型为主,浅湖线附近砂体连通性明显变差,单砂体呈现底平顶凸或者双凸透镜体状,砂体结构类型以改造河道型为主,多期次叠加呈现出平面上砂厚总和大、呈坨状分布的特点。研究后认为,陇东地区长82小层砂体结构的发育主要受物源供给、沉积环境、水动力条件及湖盆底形的影响。Using the core and logging data,based on the sedimentary environment and hydrodynamic analysis,we analyzed the sandbody types and sandbody structure characteristics of Chang 82 subayer of Longdong area,and the genetic model of the sandbody structure was summarized.The results show that three types of sandbodies are developed in Chang 82 subayer,which are subaqueous distributary channel sandbodies,sheet sands and beach sands.These sandbodies constitute four types of sandbody structures,which are normal channel type,superimposed channel type,modified channel type and isolated sandbody type.On the plane,the main sandbodies in the braided river deltas front subfacies in the southwest are strip-shaped.And the main sandbodies near the shallow lake line are distributed in a braided and patchy shape along the line.In the section,the connectivity of the sandbody in the braided river delta front subfacies is generally good.The sandbody structure type is mainly superimposed channel type and normal channel type.The sandbody connectivity near the shallow lake line is obviously deteriorated,which single sandbody has the shape of flat top convex or double convex lens.Its sandbody structure type is mainly modified channel type.The sandbodies are multistage superposition which shows the characteristics of large sum of sandbody thickness on the plane and the braided distribution.The sandbody structure of the Chang 82 subayer of Longdong area is mainly affected by the source supply,sedimentary environment,hydrodynamic conditions and the shape of the basin basin.

关 键 词：砂体结构 砂体类型 成因模式 长8_2小层 陇东地区 鄂尔多斯盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]