综合测录井信息的砂砾岩储集层流体性质识别方法

Identification method of fluid properties of glutenite reservoirs based on integrated information of well logging and mud logging

北部湾盆地乌石凹陷古近系流沙港组发育一套砂砾岩油气藏,油气层电阻率差异较大,高、低电阻率油气层并存,流体性质难以识别,给油田开发带来一定难度。为此,结合常规测井、气测录井、三维定量荧光录井资料,展开研究区测录井流体性质解释方法的研究。优先运用电阻率与中子密度幅度差交会法识别高电阻率油层、高电阻率气层,再基于录井资料创建了能量系数法、雷达图面积比值法两个气测解释图板,运用三维定量荧光参数解释图板识别低电阻率油层,建立了一套综合测录井资料的砂砾岩油气藏流体性质逐步识别法。在研究区已试油、取样的8口井验证结果表明,该综合评价方法与试油、取样资料吻合较好,对乌石凹陷储集层精细评价与后期整体开发具有一定指导意义。

There is a set of glutenite reservoirs developed in Paleogene Liushagang Formation in Wushi Sag,Beibu Gulf Basin.The resistivity of the hydrocarbon reservoir is quite different,hydrocarbon reservoirs with high and low resistance coexist,and fluid properties are difficult to identify,which brings certain difficulties to oilfield development.To this end,combined with conventional well logging,gas logging and 3D quantitative fluorescence logging data,the study on the interpretation method of fluid properties in the well logging and mud logging in the study area is launched.Resistivity and neutron density amplitude difference intersection were prioritized to identify high resistivity oil layers and high resistivity gas layers,two gas logging interpretation charts,energy coefficient method and radar map area ratio method,were created based on mud logging data,3D quantitative fluorescence parameter interpretation chart was used to identify low resistivity oil layers,and a set of identification method of fluid properties of glutenite reservoirs based on integrated data of well logging and mud logging was established.The verification result in 8 tested and sampled wells in the study area shows good correspondence between the comprehensive evaluation method and oil test and sampling data,which has certain guiding significance for fine evaluation and later overall development of reservoirs in Wushi Sag.