朋海油田东营组东三段低电阻率油层下限的确定

Lower limit determination for Ed3 low-resistivity reservoirs of Dongying Formation in Penghai Oilfield

朋海油田位于渤海湾某浅海海域,东营组东三段是其主要目的层之一,该区地质背景复杂,油层电阻率普遍偏低,油气水识别难度大。在分析该区低电阻率油层主要成因并明确其有效厚度所涉及的岩性、物性、含油性以及对应的电性基础上,采用以岩心观察及其相关分析确定含油级别,岩石物理实验结合测井分析确定岩性、物性以及电性,对照试油结论,分别分析涉及低电阻率油层有效厚度的4性特征,据此确定符合该区地质特点的低电阻率油层下限。油水层划分图板表明油水分异效果明显。

Penghai Oilfield is located in a shallow sea of Bohai Bay,one of the main target layers is Ed3 member of Dongying formation,the area has a complex geological background with generally low-resistivity reservoirs,the identification of oil,gas and water is difficult.On the basis of analysis of the main causes of low-resistivity reservoirs in the area and making clear about lithology,physical property,oiliness and the corresponding electrical property that its net thickness involved,core observation and correlation analysis were used to determine the oil-bearing levels,petrophysical experiments were combined with well logging analysis to determine lithology,physical and electrical properties,referring to oil testing conclusion,the authors analyzed 4-property characteristics which involved the net thickness of low-resistivity reservoirs and determined the lower limit of low-resistivity reservoirs which fitted the geological features of the area.The chart of dividing oil and water layers showed that differences were obvious.