砂岩的弹性模量与孔隙率、泥质含量、有效压力和温度的经验关系

Empirical relationship among elastic modulus, porosity, clay content, effective pressure and temperature in dry core sample of sandstone.

本文对干岩石弹性模量的计算方法进行了归纳和总结 ,并对各种方法的特点、实用性进行了简要分析。在此基础上 ,综合利用大庆油田 (1996)和 Phillips等人 (1989)的岩石物理实验结果以及大庆油田的部分测井资料 ,研究了砂岩中孔隙率、泥质含量、有效压力以及温度对干岩石弹性模量的影响 ,并给出了两个最佳拟合公式。这两个公式克服了以往经验公式的局限性 ,使得在缺乏岩石物理实验结果的地区 ,利用 Gassmann方程分析储层条件下砂岩速度的变化规律成为可能 ,特别是对油藏强化开采时移地震监测可行性的模拟分析具有重要的意义。

The paper summed up and summarized calculating method for elastic modulus of dry core sample and gave brief analysis for feature and practicelity of different methods. Comprehensively using the results in petrophysical laboratory of Daqing Oil field (1996) and Phillips et al (1989) and a part of logging data in Daqing Oil field on that basis, the effects of porosity, clay content, effective pressure and temperature in sandstone on elastic modulus of dry core sample has been studied and two optimal fitting formulas have been obtained. These two formulas overcome the limits in former empiric formulas and made it possible that uses Gassmann equation to analyze changing rule of sandstone velocity in a condition of reservoir in a area where results in petrophysical laboratory are absent. There is of great significance especially to model and analyze feasibility of time-lapse seismic monitoring for enhancing oil recovery of reservoir.