CB油田低阻油层成因及油水层识别

Genesis of Low Resistance Oil Layers and Identification of Oil-Water Layers in CB Oilfield

低阻油层的成因往往复杂多样而难以直接解释。本文的研究区域为位于苏北盆地的CB油田,研究区内低阻油层泥质含量大、岩石颗粒细导致束缚水饱和度高是油层低电阻率的主要控制因素,地层坡度较缓也是研究区域油层低阻的控制因素。地层电阻率受束缚水影响较大,应作为低阻油层进行针对性的识别。本次研究通过老区老井复查,针对研究区域内的可疑层开展低阻油层的识别,划分了新的有效厚度,对后续开发增产、调补层工作具有一定的意义。

The genesis of low resistance oil reservoirs is often complex and diverse, making it difficult to directly explain. The research area of this article is the CB oilfield located in the Northern Jiangsu basin. The high mud content and fine rock particles in the low resistance oil layer in the study area lead to high bound water saturation, which is the main control factor for low resistance of the oil layer. The gentle slope of the formation is also the control factor for low resistance of the oil layer in the study area. The formation resistivity is greatly affected by bound water and should be identified as a low resistance oil layer for targeted identification. This study identified a new effective thickness for a batch of low resistance oil layers in the study area through re examination of old wells in the old area, which has certain significance for subsequent development, production increase, and adjustment of layers.