砂质辫状河储层构型表征方法——以苏丹穆格莱特盆地Hegli油田为例  

A quantitative method for architectural characterization of sandy braided-river reservoirs:taking Hegli oilfield of Muglad Basin in Sudan as an example

作　　者：孙天建[1] 穆龙新[1] 吴向红[1] 赵国良[1] 徐锋[1] 王振军[2] 覃志[2] 方子奇[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油吉林油田公司勘探开发研究院,吉林松原138000 [3]石油工业出版社有限公司,北京100011

出　　处：《石油学报》2014年第4期715-724,共10页Acta Petrolei Sinica

基　　金：中国石油天然气集团公司重大科技专项(2011E-2507)资助

摘　　要：分析了苏丹穆格莱特盆地Hegli油田S1A单层砂质辫状河沉积微相特征,识别了砂质辫状河储层不同层次的构型界面,将其划分为辫流带、单砂体和心滩内增生体3个层次,明确了目的层辫状河道具有泥质充填、半泥质充填和砂质充填3种模式.依据砂质辫状河储层不同层次构型单元规模的计算公式,实现了砂质辫状河储层的辫流带、单砂体和心滩内增生体规模的定量表征,形成了一套砂质辫状河储层不同层次构型单元定量表征的方法.定量表征的结果表明,研究区辫流带宽度约3 200 m,心滩宽度350～900m,心滩长度1 200～3 200m,单河道宽度100～300m,增生体的宽度和长度分别为100～400m和700～2 000m.以不同构型单元定量表征的规模为约束条件,采用相控与人机交互的方法,建立了能够反映辫状河储层构型空间分布特征的三维地质模型.The characteristics of microfaces in single-layer sandy braided-river deposits of the SIA of the Hegli oilfield, Muglad Basin, Sundan are analyzed, and three hierarchical levels of architecture interfaces in sandy braided-river reservoirs are identified, including single braided channel belt, single sand body, and single accretion of channel bar. The target braided channels are filled in three models with mudstone, semi-mudstone, and sand bodies, respectively. The scales of architectural units at different hierarchical lev- els in sandy braided-river reservoirs are quantitatively characterized using specific calculation formulas, and a set of methods for quantitative characterization of architectural units in sandy braided-river reservoirs is developed. The results of sing-level quantitative characterization show that single belts are approximately 3 200 m wide; single channel bars are 350-900 m wide and 1 200-3 200 m long;single channels are 100-300 m wide; and single accretions are 100-400 m wide and 700-2 000 m long in S1A of the study area. With the constraint of the scale for quantitative characterization of different architectural units, a three-dimensional geological model is built using facies-control and man-computer interaction method to accurately delineate spatial distribution pattern of architectural u- nits in sandy braided-river reservoirs.

关 键 词：苏丹 砂质辫状河 层次分析 储层构型 构型建模 

分 类 号：TE122.14[石油与天然气工程—油气勘探]