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塔中 I号断裂构造带是塔里木盆地中的一个重要油气聚集带 ,中奥陶统灰岩是其最主要的储集层。中奥陶统沉积时期 ,该带位于碳酸盐台地边缘 ,发育粒屑滩、生物礁和灰泥丘沉积。这一沉积相带决定了该带中奥陶统灰岩储层明显好于其周缘地区。岩心及薄片观测结果表明 ,该区灰岩储层的主要储集空间包括孔隙、裂缝和溶洞等 ,它们在不同部位构成不同的组合类型。岩石物性分析显示 ,灰岩储层的基质孔隙度较低 ,绝大部分属低孔、特低孔储层 ,渗透率分布较宽 ,但总体仍偏低。沉积相类型、构造作用和成岩作用是影响该区储层发育程度的主要因素 ,在它们的共同影响下 ,不同层位、不同井区间的储层差别也较大。
The Tazhong I fault zone is an important hydrocarbon accumulation zone in the Tarim Basin. The Middle Ordovician limestone is the most important reservoir. During the Middle Ordovician deposition, the belt was located on the margin of the carbonate platform and developed the deposition of debris beaches, reefs and plaster mounds. This sedimentary facies belt determines that the Ordovician limestone reservoir in this zone is significantly better than its periphery. The observation results of core and thin sections show that the main reservoir space of limestone reservoirs in this area includes pores, fractures and caves, which form different types of assemblages in different parts. Petrophysical analysis shows that the matrix porosity of limestone reservoirs is relatively low, most of them are low-porosity and ultra-low-porosity reservoirs, and their permeability distributions are relatively wide, but the overall values are still low. Sedimentary facies types, tectonism and diagenesis are the main factors affecting the degree of reservoir development in this area. Under the common influence of these types of reservoirs, the reservoirs differ in different layers and different well zones.