扇三角洲前缘沉积特征及对油藏有效开发的影响——以辽河西部凹陷某试验区于楼油层油藏为例  

Depositional characteristics of fan delta deposits and their impacts to reservoir development-An example from Liaohe Basin

作　　者：陈欢庆[1] 王珏[1] 胡海燕[2] 杜宜静[1] 樊涛[3] CHEN Huanqing;WANG Jue;HU Haiyan;DU Yijing;FAN Tao(Research Institute of Petroleum Exploration and Development,Petro China,Beijing 100083,China;Petrochina Exploration and Development Company,Beijing 100007,China;Institute of Exploration and Development,PetroChina Liaohe Oilfield Company,Panjin 124010,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油天然气股份有限公司勘探与生产分公司,北京100007 [3]中国石油辽河油田分公司勘探开发研究院,盘锦124010

出　　处：《海洋地质与第四纪地质》2018年第5期156-170,共15页Marine Geology & Quaternary Geology

基　　金：国家科技重大专项"CO2驱油与埋存关键技术"(2011ZX05016-006);中国石油天然气股份有限公司勘探与生产分公司"精细油藏描述项目"(2018-40217-000001)

摘　　要：以辽河盆地西部凹陷某试验区于楼油层为例,综合7口取心井岩心、镜下薄片和分析测试资料,400口井测井资料以及工区地震资料,在建立高分辨率等时地层格架和确定沉积相类型的基础上,划分沉积微相,刻画不同沉积微相发育特征,同时分析了沉积微相对开发的影响。通过岩性、层理构造、泥岩颜色、化石特征和粒度概率曲线等相标志,确定研究区目的层为扇三角洲前缘沉积,物源呈北西-南东和南北向,可划分为水下分流河道、河口沙坝、水下分流河道间砂、水下分流河道间泥和前缘席状砂等5种沉积微相。储层以水下分流河道、水下分流河道间砂沉积为主。自底部的单层yII36b至顶部的单层yI11a,目的层整体上为向上逐渐变粗的反旋回特征。河道宽200~300m,长度可达数百米,砂体数量多,规模小。受水下分流河道的频繁分流改道,砂体相互切叠,储层非均质性强烈。蒸汽驱热采时应该充分考虑单砂体沉积微相空间组合模式和平面展布规律。The Yulou oil bearing sets from one of the experimental areas in the south end of western slope of the West Depression of the Liaohe Basin is selected in this paper as a case to study the depositional characteristics of a fan delta and their impacts to reservoir development.Core and slice data,geochemical data of seven wells and logging data for 400 wells in addition to seismic data are collected for interpretation.On the basis of the high resolution stratigraphic framework,sedimentary facies are identified and described.At the same times,the influences of sedimentary facies to reservoir development are analyzed.The target layer is divided into 29 single sublayers according to well data and seismic data.The conclusion of facies analysis of the target layer is further confirmed as a fan delta front by lithology,beddings,colour of mudstone,fossil assemblage and grain size distribution patterns.Sediments came from NW and north.Five types of sedimentary facies,i.e.the underwater distributary and channel sands,river mouth bar,underwater distributary channel mudstone and delta front sheetlike sand are well developed in the study area.In general,underwater distributary channel and underwater distributary channel sand dominate the sequence with the river mouth bar and delta front sheet-like sand as the next.From the bottom single layer of yII36 b to the top single layer of yI11 a,the target layer shows an inversed cyclic characteristic and becomes coarsening up from bottom to top.Effected by frequent rechannelization of underwater distributaries,sandstone deposits become more heterogeneous.Distribution pattern and composition of depositional facies should be sufficiently considered in thermal recovery of oil with steam.

关 键 词：辽河盆地西部凹陷 于楼油层 沉积微相 扇三角洲前缘 油藏开发 

分 类 号：P618.13[天文地球—矿床学]