安塞浅水三角洲前缘复合单砂体精细识别与划分  

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

作　　者：赵晔 师永民[1] 刘新菊 万琳 冯博 Zhao Ye;Shi Yongmin;Liu Xinju;Wan Lin;Feng Bo(Peking University,Beijing,100871,China;PetroChina Changqing Oilfield Company,Xi＇an,Shaanxi 716000,China;China University of Geosciences（Beijing）,Beijing 100083,China)

机构地区：[1]北京大学,北京100871 [2]中国石油长庆油田分公司,陕西延安716000 [3]中国地质大学(北京),北京100083

出　　处：《特种油气藏》2018年第3期56-60,共5页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2017ZX05013005-009)

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、宏观剩余油分布具强分散等问题。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。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。The relatively high migration frequency of Chang6 single-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 Basin.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,7 types of 12 contact 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 controlled by the present well pattern.This research could provide certain geological reference for the recovery of remaining oil in the middle-late development stage.

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 

分 类 号：TE122.2[石油与天然气工程—油气勘探]