Fluid sensitivity study of elastic parameters in low-medium porosity and permeability reservoir rocks
Pei Fa-Gen1, Zou Chang-Chun1, He Tao2, Shi Ge2, Qiu Gen-Gen1, and Ren Ke-Ying3
1. Key Laboratory of Geo-detection (China University of Geosciences, Beijing), Ministry of Education, Beijing 100083, China.
2. School of Earth and Space Sciences, Peking University, Beijing 100871, China.
3. Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang 524057, China.
Abstract：
In this article, based on the acoustic measurements of core samples obtained from the low to medium porosity and permeability reservoirs in the WXS Depression, the densities and P and S wave velocities of these core samples were obtained. Then based on these data, a series of elastic parameters were computed. From the basic theory and previous pore fluid research results, we derived a new fluid identification factor (F). Using the relative variations, Ag/w and Ao/w, of the elastic parameters between gas and water saturated samples and between oil and water saturated samples, λρ, σHSFIF, Kρ, λρ - 2μρ, and F as quantitative indicators, we evaluate the sensitivity of the different fluid identification factors to identify reservoir fluids and validate the effects by crossplots. These confirm that the new fluid identification factor (F) is more sensitive for distinguishing oil and water than the traditional method and is more favorable for fliud identification in low to medium porosity and permeability reservoirs.
PEI Fa-Gen,ZOU Chang-Chun,HE Tao et al. Fluid sensitivity study of elastic parameters in low-medium porosity and permeability reservoir rocks[J]. APPLIED GEOPHYSICS, 2010, 7(1): 1-9.
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