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裂缝通道是垂直贯穿整个储层厚度并在横向上延伸数十米到数百米不等的垂直板状体裂缝群。裂缝通道通常与断层或原生断层有关,它是中东地区许多断层系统的主要构造单元。这种裂缝可以从裸眼井水平井成像测井图像上识别出来,但是只有少数有限的井有成像测井资料,所以有必要使用一种间接的、探测裂缝通道的手段。裂缝通道在水平井的裸眼井测井曲线上表现为尖峰响应。在注水井区,裂缝通道可以通过饱和度测井曲线的尖峰识别出来,而在孔隙度测井曲线上则没有响应。已固井的裂缝通道在密度测井曲线上有尖峰响应。在许多情况下,裂缝通道通常与井径扩大、钻井液漏失有关。在中东的一些碳酸盐岩储层中,裂缝通道在自然伽马测井曲线上有尖峰响应。因为裂缝通道不是造成裸眼井测井曲线上有尖峰响应的唯一原因,所以有必要通过其他测井曲线与成像测井图像进行对比,来确定裂缝通道所对应的响应。假如特征响应可以识别出来,再结合堵漏数据,就可以定位那些没有成像测井图像的水平井的裂缝通道。如果有足够数量的含有裂缝通道的成像测井图像资料,就可以把测井曲线上的尖峰和实际的裂缝通道联系起来,从而确定出准确识别一个裂缝通道的概率。
The fracture channel is a group of vertical plate-like fractures that extend vertically throughout the entire reservoir thickness and extend in the horizontal direction from tens to hundreds of meters. Fissure channels are usually associated with faults or primary faults, which are the main tectonic units of many fault systems in the Middle East. Such fractures can be identified from borehole horizontal well imaging logs but only a limited number of wells have imaging logs, so it is necessary to use an indirect means of detecting the fracture channels. Crack channels appear as spikes in openhole logs in horizontal wells. In the injection well area, the fracture channel can be identified by the spike of the saturation well curve, but not in the porosity well log. Cementing fracture channels have a spike response on density logs. In many cases, the fracture path is usually related to borehole diameter expansion and fluid loss. In some carbonate reservoirs in the Middle East, crack channels have a spike response on natural gamma ray logging curves. Because the crack channel is not the only cause of spike response on the openhole log, it is necessary to compare the other logs against the imaging log to determine the response of the crack channel. If the signature response can be identified and combined with the plugging data, it is possible to locate the cracked channels in horizontal wells without imaged log images. If there is a sufficient amount of imaged well imagery with cracked channels, the spikes in the wellbore curve can be correlated with the actual cracked channel to determine the probability of accurately identifying a cracked channel.