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Improvement of petrophysical evaluation in a gas bearing carbonate reservoir-A case in Persian Gulf

机译:含气碳酸盐岩储层岩石物性评价的改进-以波斯湾为例

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摘要

Significant digenetic processes such as dolomitization, chemical dissolution, reprecipitation, fracturing, etc. create complex pore size distribution in carbonate reservoirs. Contrary to sandstones, the pore size distribution in carbonates is bimodal or trimodal. The existence of organic material increases the complexity, too. The dominant carbonate minerals are dolomite and calcite, commonly associated with a variable content of anhydrite. Anhydrite content negatively impacts the well log interpretation and complicates carbonates behavior compared to sandstones. In addition, the existence of gas affects the whole interpretation by underestimating porosity, due to low hydrogen index. Therefore, to have an accurate hydrocarbon in place estimation, we have to reduce the abovementioned problems in the interpretation.
机译:重要的成岩过程,如白云石化,化学溶解,再沉淀,压裂等,在碳酸盐岩储层中产生了复杂的孔径分布。与砂岩相反,碳酸盐的孔径分布是双峰或三峰的。有机材料的存在也增加了复杂性。主要的碳酸盐矿物是白云石和方解石,通常与可变含量的硬石膏有关。与砂岩相比,硬石膏含量会对测井解释产生不利影响,并使碳酸盐岩行为复杂化。此外,由于氢指数低,气体的存在会通过低估孔隙率来影响整个解释。因此,为了获得准确的碳氢化合物到位估算,我们必须减少解释中的上述问题。

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