安塞浅水三角洲前缘复合单砂体精细识别与划分

一一收稿日期:20171229;改回日期:20180318一一基金项目:国家科技重大专项大型油气田及煤层气开发 (2017ZX05013005-009)一一作者简介:赵晔(1993 ),女,2015年毕业于中国地质大学(北京)资源勘查与工程(能源)专业,现为北京大学石油地质学专业在读硕士研究生,主要从事油气田勘探与开发方向的研究三DOI :10．3969/j．issn．1006-6535．2018．03．011

赵一晔1,师永民1,刘新菊2,万一琳2,冯一博3

(1．北京大学,北京一100871;2．中国石油长庆油田分公司,陕西一延安一716000;3．中国地质大学(北京),北京一100083)摘要:鄂尔多斯盆地东缘安塞浅水三角洲前缘长6储层单期河道砂体中心迁移频率较快,导致

储层物性差异较大,由于对砂体展布规律认识不足,普遍存在注采不对应二宏观剩余油分布具

强分散等问题三在野外露头的指导下,依据测井数据,以三大类单一成因砂体的7种12类接

触组合关系,对研究区复合单砂体进行表征:水下分流河道砂体作为骨架砂体发育最广,强分

流改道与汇流区域普遍发育水下分流河道-水下分流河道型;席状砂沟通其他类型砂体时

油层连片分布,但侧向切叠的席状砂不具备挖潜条件;分离型砂体在下游区最为发育,砂体直

接接触泥岩,却不为井网所控制三该项研究为油田开发中后期剩余油的挖潜提供可操作的地

质依据三

关键词:浅水三角洲前缘相;复合单砂体构型;单一成因砂体组合;测井曲线;鄂尔多斯盆地

中图分类号:TE122．2一一文献标识码:A 一一文章编号:1006-6535(2018)03-0056-05

Precise Identification and Classification of Composite Single Sandbodies in the Ansai Shallow Water Delta Front

Zhao Ye 1,Shi Yongmin 1,Liu Xinju 2,Wan Lin 2,Feng Bo 3

(1.Peking University ,Beijing ,100871,China ;

2.PetroChina Changqing Oilfield Company ,Xi 'an ,Shaanxi 716000,China ;

3.China University of Geosciences (Beijing ),Beijing 100083,China )Abstract :The relatively high migration frequency of Chang 6single -phase channel sandbodies in the front margin of Ansai shallow water delta results in a large difference in reservoir properties in the eastern margin of the Ordos Ba-sin.The lack of understanding in sandbody distribution usually leads to injection -production imbalance ,disperse

distribution of macroscopic residual oil and other problems.Based on the field outcrop observation and logging data ,

7types of 12contact combinations in the three main types of monogenetic sandbody are used to characterize the composite single sandbody in this area.The well -developed underwater distributary channel sandbody is served as the skeleton sandbody.The strong shunt diversion and confluence areas are dominated by the type of underwater distributary channel -underwater distributary channel .The oil layer is contiguous when the sheet sand connects to other sandbody types.However ,there is no recovery potential for the laterally -inflected sheet sand.The separated sandbody is most developed in the downstream area.The sandbody directly contacts with mudstone cannot be con-trolled by the present well pattern.This research could provide certain geological reference for the recovery of remai-ning oil in the middle -late development stage.

Key words :shallow water delta front ;composite single sandbody configuration ;monogenetic sandbody combina-

tion ;logging curve ;Ordos Basin 0一引一言

安塞油田上三叠统延长组安塞三角洲是大型内陆淡水湖盆河控的浅水三角洲,主要含油层系长61形成于三角洲建设高峰期,油层厚度达20余米,具有河口坝发育少二改造强烈二水下分流河道摆万方数据