巴麦地区晚石炭世碳酸盐岩台内滩储层综合评价

碳酸盐岩台内滩是重要的油气勘探目标，但关于台内滩储层的形成与评价研究相对薄弱。以巴麦地区先巴扎区块上石炭统小海子组作为研究碳酸盐岩台内滩的典型实例，“露头-岩心-镜下-测井-地震”五位一体综合分析表明，小海子组发育-蜓-类生屑滩、藻核形石滩、生屑滩、砂屑滩和薄皮鲕粒滩等5种碳酸盐岩台内滩，形成于海侵背景下、内缓坡台地中的微低古隆起环境，受控于构造变形和海平面变化。优质储层受开阔台地浅滩沉积作用和（准）同生期成岩作用控制；纵向上小海子组下亚段的储层物性比上亚段好；平面上Ⅰ类储层自Bt8井沿北东东向至西南向呈条带状展布，与台内古地貌较高区域相对应；Ⅱ类储层主要发育在台内古地貌较低区域，呈零散的片状分布。

Integrated Reservoir Characterization of Late Carboniferous Carbonate Inner Platform Shoals in Bamai Region,Tarim Basin

Both domestic and abroad petroleum production demonstrate that carbonate inner platform shoals have been the most important targets for hydrocarbon exploration. But domestic researches on the creation and development of inner platform shoal reservoirs are relatively inadequate, the authors provide a new typical case of inner-platform shoals concerning Xiaohaizi Formation of Late Carboniferous in Bamai region, Tarim basin. Based on the integrative investigation of outcrops, cores, thin sections, logs, and seismic data, it is found that inner platform buildup is composed of fusulinid bioclastic, algal oncoid, and bioclastic and superficial oolitic, and sand shoals, and thereby deduced that these shoals formed in inner ramp micro-paleo-uplift environment under the global transgression setting, and controlled by tectonic deformation and sea level change. Also it is inferred that most high-quality reservoir rocks occur vertically in the lower part of Xiaohaizi Formation, and that horizontally the excellent reservoir rocks (reservoir rock typeⅠ) extend from the northeastern well Bt 8 to the southwestern corresponding to the highest relief in the open-marine inner platform paleoenvironment，and the good reservoir rocks (reservoir rock typeⅡ) appear scatteredly corresponding to the higher relief. Ultimately, it is concluded that the formation and distribution of high-quality inner platform shoal reservoirs are primarily influenced by open marine inner platform shoal sedimentation and the early diagenesis.