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杭锦旗地区上古生界的勘探和生产资料证实该区发育较多低阻气层,但低阻成因目前尚不明确,给该区低阻气层的流体识别和测井评价,尤其是含水饱和度的计算带来较大困难。为此,利用分析化验资料和测井资料,分析并总结出该区低阻气层的成因为黏土矿物附加导电、微孔隙发育和地层水矿化度的影响;并基于该区低阻成因,总结了影响地层水导电性能的3类导电流体,即泥质(束缚水)、微孔隙导电流体(毛细管水)和大孔隙导电流体(自由水),建立了改进的“双水模型”及相关参数估算方案来计算低阻气层的饱和度。实际应用结果表明,该方法在杭锦旗地区低阻气层的测井解释评价中效果良好,与测试结果符合较好;可为低阻气层测井评价提供一种技术方案。
The exploration and production data of the Upper Paleozoic in Hangjinqi area confirm that there are more low-resistance gas layers in this area, but the cause of low-resistance is not clear yet. Fluid identification and logging evaluation of the low-resistance gas reservoirs in this area, especially the water saturation Degree calculation brings greater difficulty. Based on the analysis of laboratory data and well logging data, the causes of low resistivity gas layers in this area are analyzed as the additional conductivity, micropore development and formation water salinity of clay minerals. Based on the genesis of low resistivity in this area, Three types of conductive fluids that affect conductivity of formation water are summarized, namely muddy water, microporous conductive fluid (capillary water) and macroporous conductive fluid (free water) And related parameter estimation scheme to calculate the saturation of low gas barrier. The practical application results show that the method is effective in logging interpretation and evaluation of low resistivity gas reservoirs in Hangjinqi area, and is in good agreement with the test results. It can provide a technical solution for the logging evaluation of low resistivity gas reservoirs.