砂岩储层孔隙度影响因素研究

Research on Influential Factors of Sandstone Reservoirs

以岩心孔隙度分析和测井数字化资料为基础,以威利公式为理论依据,研究影响砂岩储层声波时差的因素,指出砂岩储层的声波时差与孔隙度之间并不是一一对应关系,其中泥质填隙物含量、压实程度以及流体成分是声波时差的重要影响因素。针对不同影响因素,提出了相应的校正方法,校正后的岩心分析孔隙度与声波孔隙度的相关性显著提高;而校正后的优越性进一步体现在渗透率计算结果上,解释渗透率与岩心渗透率相关系数高达0.9597。由于给出了各影响因素的具体校正方法,因此,该方法具有广泛的应用价值,对于提高储层孔隙度和渗透率解释精度具有重要意义。

Based on core porosity analysis and logging digitalization data,as well as Time Average Formula in acoustic wave propagation put forward by Willey,the factors affecting sandstone reservoir acoustic interval transit time(AC for short) were studied.And it was pointed out that there was no one-to-one correspondence between AC and porosity of sandstone reservoirs,and the argillaceous interstitial material content in sandstone reservoir,degree of compactness together with fluid components were important factors affecting AC.Moreover,correspondent correcting methods are put forward for different influential factors,after correction and core analysis,porosity and acoustic porosity correlation improve significantly;and the superiority is reflected in the permeability results,explained permeability coefficient of permeability and core related is as high as 0.9597.Because the model refers to many influential factors and specific correcting methods of all influential factors are put forward.Therefore,the method can be widely used and it is of great significance for improving the accuracy of reservoir porosity and permeability interpretation.