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Assessment of mudstone compaction in exploration wells in the Rovuma Basin offshore Mozambique

机译:莫桑比克近海鲁伍马盆地勘探井的泥岩压实评估

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摘要

In order to develop an improved pore pressure prediction model for the overburden mudstones in the Rovuma Basin, offshore Mozambique, we apply Eaton's method to example well data from three exploration wells, which intersect Quaternary, Tertiary and Cretaceous sediments over depth intervals down to ∼3 km below seafloor. The predictive method only included the effects of mechanical compaction, which is a reasonable assumption for the low-temperature shallow sections. We found that Eaton's method applied to resistivity and acoustic log attributes works well and can be used to identify the mudstones that display over-pressured or normally pressured sections. The predicted pore pressures showed a good match to pore pressures in permeable formations. Using this calibration, we derived an improved pore-pressure prediction method for these wells and for the Rovuma Basin in general. The resulting model should give a good basis for future analysis of compaction processes and pore pressure in this basin.
机译:为了开发莫桑比克近海Rovuma盆地上覆泥岩的改进的孔隙压力预测模型,我们采用伊顿的方法对来自三个勘探井的井眼数据进行举例,这些勘探井相交深度约3至3的第四纪,第三纪和白垩纪沉积物。海底以下公里。预测方法仅包括机械压实的影响,这是对低温浅层断面的合理假设。我们发现,应用于电阻率和声波测井属性的伊顿方法效果很好,可用于识别显示超压或正压剖面的泥岩。预测的孔隙压力显示出与渗透性地层中孔隙压力的良好匹配。使用此校准,我们得出了这些井和一般Rovuma盆地的改进的孔隙压力预测方法。所得模型应为该盆地的压实过程和孔隙压力的未来分析提供良好的基础。

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