Characteristics of fluid substitution in porous rocks |
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Authors: | Li Shengjie |
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Affiliation: | School of Resource and Information Technology, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;Key Laboratory of CNPC Geophysical Exploration,China University of Petroleum,Beijing 102249,China |
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Abstract: | Analysis of the effect of changes in fluid properties of rocks on the compressional-wave velocity V
P and shear-wave velocity V
S is very important for understanding the rock physical properties, especially in oilfield exploration and development. The
fluid substitution process was analyzed by using ultrasonic measurement and theoretical calculations. The results showed that
the effect of fluid substitution on the rock elastic modulus was mainly controlled by fluid properties, saturation, and confining
pressure. For a rock with specific properties and porosity, the result of theoretical prediction for fluid substitution accorded
with the experimental result under high confining pressure (higher than 60 MPa for our experimental data), but failed to describe
the trend of experimental result under low confining pressure and V
P predicted by Gassmann’s equation was higher than that measured by experiment. A higher porosity resulted in stronger sensitivity
of the bulk modulus of saturated rocks to the change of fluid properties. |
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Keywords: | Fluid substitution velocity bulk modulus porosity saturation |
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