A rock-physical modeling method for carbonate reservoirs at seismic scale

A rock-physical modeling method for carbonate reservoirs at seismic scale
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地震尺度碳酸盐岩储层岩石物理模拟方法

DOI:
10.1007/s11770-013-0364-6
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发表时间:
2013-02
期刊:
影响因子:
0.7
通讯作者:
Chen Xiao-Hong
Chen Xiao-Hong
中科院分区:
地球科学4区
文献类型:
--
作者:
Li Jing-Ye;Chen Xiao-Hong

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碳酸盐岩储层具有很强的非均质性和复杂的孔隙系统,使得其岩石物理模型的建立和流体置换变得困难和复杂。然而,岩石物理模型将储层参数与地震参数联系起来,流体替代是储层预测和定量描述的最有效工具。在分析复杂的碳酸盐岩储集层孔隙结构和地震尺度非均质性的基础上,采用网格法将碳酸盐岩划分为具有独立岩石参数的均质区块,并根据孔隙成因和构造特征,采用不同的岩石物理模型逐步计算干岩单元的弹性模数。然后,基于不同的孔隙连通性,通过流体置换得到了不同流体饱和岩石的弹性模数。在计算岩石单元弹性模数的基础上,采用Hashin-Shtrikman-Walpole弹性边界理论计算了地震尺度下的碳酸盐岩弹性参数。通过对不同孔隙类型组合的碳酸盐岩模型的计算和分析,揭示了孔隙类型对岩石弹性参数的影响。模拟结果与我们对真实数据的认识是一致的。
Strong heterogeneity and complex pore systems of carbonate reservoir rock make its rock physics model building and fluid substitution difficult and complex. However, rock physics models connect reservoir parameters with seismic parameters and fluid substitution is the most effective tool for reservoir prediction and quantitative characterization. On the basis of analyzing complex carbonate reservoir pore structures and heterogeneity at seismic scale, we use the gridding method to divide carbonate rock into homogeneous blocks with independent rock parameters and calculate the elastic moduli of dry rock units step by step using different rock physics models based on pore origin and structural feature. Then, the elastic moduli of rocks saturated with different fluids are obtained using fluid substitution based on different pore connectivity. Based on the calculated elastic moduli of rock units, the Hashin-Shtrikman-Walpole elastic boundary theory is adopted to calculate the carbonate elastic parameters at seismic scale. The calculation and analysis of carbonate models with different combinations of pore types demonstrate the effects of pore type on rock elastic parameters. The simulated result is consistent with our knowledge of real data.
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