塔河油田碳酸盐岩储层类型划分

The types of carbonate reservoir in Tahe oilfield.

对塔河油田奥陶系碳酸盐岩储层的储渗起决定作用的主要是裂缝和溶蚀孔洞。而储层的孔隙空间结构很大程度地决定着地层原始流体的分布以及储层的储量和产能,为此,提出了用常规测井资料计算导电效率、分数维及裂缝密度的方法。针对塔河油田碳酸盐岩储层的具体情况,利用交会图方式,确定了通过采用导电效率和裂缝密度来划分储层类型的标准,即导电效率大于0.03或裂缝密度大于1.4,储层裂缝发育;否则为孔洞性储层。此外,分维数越大高角度裂缝越发育。实际资料处理表明,该方法适用于塔河油田碳酸盐岩储层类型的划分。

Ordovician in Tahe oilfield belongs to carbonate reservoir, fracture and corrosion cavern are acting on oilfield reservoir and permeability. Besides, the distributing of the original fluids in the reservoir, production and product modes of reservoir are affected by pore structure of reservoir in great extent. The method is present that using common well logging data to calculate the electrical conduction efficiency, fractal dimension and fracture density. By the practicality in Tahe oilfield, the method and standard is referred to that distinguishing the reservoir types using the electrical conduction efficiency and fracture density. Namely electrical conduction efficiency is more than 0. 03 or fracture density is more than 1. 4. When reservoir fracture is well developed; otherwise, it is pore reservoir. Moreover, if the fractal is bigger and bigger, high angle fracture is even more developed. By actual data processing, it is indicated that this method and standard is suitable for Tahe oilfield.