论文部分内容阅读
柴达木盆地西部地区油砂山组碳酸盐岩储层是油气富集的重要层位。本文结合岩心、薄片观察及物性分析表明,储层以泥晶灰岩、颗粒灰岩和藻灰岩为主,其中颗粒灰岩是最好的储集岩;形成了溶孔型、微缝-溶孔溶缝型和构造裂缝型储层,储层非均质性强,受沉积、成岩及构造作用影响,主要分布在英雄岭凹陷东部地区,溶蚀作用是储层孔隙发育的重要因素,胶结作用则对储层的渗透性能造成破坏,构造运动形成的大型构造裂缝使储层的渗透能力得到很大改善,是地层流体重要的渗流空间。该研究可为该地区油砂山组碳酸盐岩储层有利区评价和优选提供依据。
The carbonate reservoir in the Youshashan Formation in the western Qaidam Basin is an important reservoir for oil and gas accumulation. In this paper, core, thin slice observation and physical property analysis show that the reservoirs are mainly composed of micritic limestone, granular limestone and algal limestone, in which granular limestone is the best reservoir rock. The dissolved pore type, Dissolved pore type and structural fractured reservoirs, reservoir heterogeneity is strong, affected by sedimentation, diagenesis and tectonism, mainly distributed in the eastern part of the Yingxiong sag, dissolution is an important factor for reservoir pore development, cementation Which will cause damage to the permeability of the reservoir. The large structural cracks formed by tectonic movement greatly improve the permeability of the reservoir, which is an important seepage space for formation fluids. This study can provide a basis for the evaluation and optimization of favorable areas for carbonate reservoirs in the Youshashan Formation in this area.