礁灰岩储层孔隙流体敏感性参数分析——以阿姆河右岸区块生物礁储层为例

An analysis of pore fluid sensitivity parameters in reef limestone reservoirs:An example from Callovian-Oxfordian carbonate reef reservoirs in the Amu Darya Right Bank Block,Turkmenistan

储层流体敏感性参数的分析和提取是地震资料解释、反演和储层流体识别的基础。实验室含流体样品的岩石物理参数测试是寻找储层流体敏感性参数的重要研究手段之一。根据土库曼斯坦阿姆河右岸区块油气勘探需要,选取该区卡洛夫—牛津阶碳酸盐岩生物礁储层的石灰岩样品,利用MTS系统进行了岩石物理参数实验测试,通过相同测试条件下饱气和饱水岩样的测试分析,发现岩样含不同流体时地震响应特征有着明显的差异;进一步的分析结果表明:拉梅常数等参数对含气性较为敏感。同时,通过分析不同流体因子的组合,得到对含气性更为敏感的高灵敏度组合式流体识别因子。从Gassmann方程入手,分析了不同流体识别因子敏感性差异的内在机理。最后,利用实验获取的含气敏感性流体识别因子,对研究区的测井资料进行了定量交会图分析。结果表明,该方法对礁灰岩储层的气水识别有较好的效果。

Analysis and extraction of sensitivity parameters of reservoir fluids are the basis of seismic interpretation,inversion and reservoir fluid identification.Laboratory testing of physical parameters of rock samples containing fluids is one of the most important methods to study sensitivity parameters of reservoir fluids.The samples from the Callovian-Oxfordian carbonate reef limestone reservoirs in the Amu Darya Right Bank Block are selected to test rock physical parameters by using the MTS system.Samples saturated with gas and water are tested separately under the same experimental conditions.The test results show that seismic responses are significantly different from samples saturated with different fluids.Further analysis shows that the Lame constant parameter is relatively sensitive to gas.An integral fluid identification factor combination that is more sensitive to gas is obtained by analyzing combinations of different fluid factors.The intrinsic mechanism causing the sensitivity differences of different fluid recognition factors is also studied by using the Gassmann Equation.Finally,the gas-sensitive fluid recognition factors obtained from laboratory testing are used to perform quantitative cross-plot analysis of the log data in the study area.The results show that this method is effective in differentiating gas-bearing from water-bearing reef limestone reservoirs.