利用地层测试资料计算储层泥浆侵入半径

钻井泥浆滤液储层侵入研究有助于正确识别油气水层。泥浆侵入较浅时,可以利用测井响应识别部分油层;但泥浆滤液侵入较深时,利用电阻率识别油气层就十分困难。L区实测资料说明A组油气层原油由于压缩系数大,极易造成严重泥浆侵入,增大了油气层识别的难度。运用试油与测压等资料可以较准确计算泥浆侵入半径,并对泥浆侵入校正图板进行校正,从而在泥浆侵入深的地区较为准确地识别油气层。通过应用结果证明了该方法的有效性,为综合利用测井、测试资料进行储层评价提供了新的有效手段。

Calculating Invasion Radius on Oil Reservoir by Using Well

Study of mud filtrate invasion on reservoir is helpful to identify oil,gas and water zones correctly.For the oil-gas zones with less serious mud invasion,parts of oil zones can be identified by log response,but for the oil-gas zones with heavy mud invasion,it is very difficult to distinguish oil zones by resistivity method.The practical data in Block L show that the heavy mud filtrate invasion is easily found in A oil-gas formation because of high oil compressibility coefficient of crude oil in this formation,which causes the difficulty to identify oil-gas zones.The mud invaded radius calculated by using production test and pressure measurement data is more accurate than by using dual laterolog method in heavy mud invasion zones.The result can be used to correct the conventional mud invasion correction chart,and to improve the reliability of oil-gas zone identification in such zones,The application of this calculation method of mud invasion radius in Blocd L area proves that it is a reasonable and effective method for reservoir evaluation by using integrated data of well testing and wireline log.