塔中寒武—奥陶系白云岩储层特征及主控因素

Reservoir characteristics of Cambrian-Ordovician dolomite and main controlling facrors in middle area of Tarim Basin

综合岩心、镜下、结构组分及宏观地质背景等各种特征,将塔中地区寒武—奥陶系白云岩储层划分为5种类型：潮缘带白云岩储层、与蒸发潮坪/泻湖有关的潮上白云岩储层、与盆地蒸发盐有关的潮下白云岩储层、台缘高能相带白云岩储层及深部混合水成因白云岩储层。结合地球化学和岩石物性分析结果,对塔中地区白云岩储层特征、成因及分布进行了探讨,认为该区深层白云岩储层发育具有以下特点：深埋藏白云岩化作用在有热液影响的局部构造地带尤其明显;白云岩化程度与地层深度成正比;白云岩化过程中受到了海水和淡水的共同作用等。

Based on the characteristics of cores,micro-endoscopic features,structural constituent and macro-geological background,the dolomite reservoirs from Cambrian to Ordovician are divided into five genetic types,which are dolomite reservoir with wave edge,supratidal dolomite reservoir with the evaporation of tidal flat or tidal lagoon,subtidal dolomite reservoir with evaporite salt,dolomite reservoir with tableland edge of high-energy facies and deep mixed-water genetic dolomite reservoir.Combined with the results of geochemical analysis and petro-physical analysis,this paper discusses the dolomite reservoir characteristics,genesis and distribution in middle area of Tarim Basin.It is considered that the development of dolomite reservoir in study area has some characteristics.For example,the role of deep-burial dolomitization is particularly obvious in the local tectonic zone affected by heat fluid,the degree of dolomitization is directly proportional to the strata depth and the process of dolomitization in middle area of Tarim Basin is effected by the common role of sea water and fresh water.