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Fluid substitution in a shaley sandstone reservoir at seismic scale

Petroleum Science 2012年第1期9卷 31-37页

作者： Li Jingye State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumBeijing 102249China CNPC Key Laboratory of Geophysical Exploration China University of PetroleumBeijing 102249China

Shaley sandstone is heterogeneous at a seismic scale. Gassmann＇s equation is suited for fluid substitution in a homogeneous medium. To study the difference between shaley sandstone effective elastic moduli calculated by mean porosity as a homogeneous medium, and those calculated directly from the sub-volumes of the volume as a heterogeneous medium, computational experiments are conducted on Han＇s shaley sand model, the soft-sand model, the stiff-sand model, and their combination under the assumption that the shaley sandstone volume is made up of separate homogenous sub-volumes with independent porosity and clay content. Fluid substitutions are conducted by Gassmann＇s equation on rock volume and sub-volumes respectively. The computational data show that at seismic scale, there are minor differences between fluid substitution on rock volume and that on sub-volumes using Gassmann＇s equation. But fluid substitution on sub-volumes can take consideration of the effects of low porosity and low permeability sub-volumes, which can get more reasonable data, especially for low porosity reservoirs.

关键词： Fluid substitution Gassmann's equation shaley sandstone seismic scale

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

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Applied Geophysics 2013年第1期10卷 1-14,117页

作者：李景叶陈小宏中国石油大学(北京)油气资源与探测国家重点实验室北京102249 中国石油大学CNPC物探重点实验室北京102249

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.

关键词： seismic scale fluid substitution carbonate rock rock physics modeling^heterogeneity |

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