Abstract
Summary The rock physics model is a significant tool for characterization of reservoir. Pore geometry of shale reservoir is usually complicated and pore aspect ratio is an important parameter which can be used to characterize the pore geometry. Hence, we intend to build a rock physics model for shale reservoir, and use it to inverse pore aspect ratio and predict S wave velocity. However, we find the error between predicted S wave velocity and measured S wave velocity increase as clay volume increase. In addition, the lamination of clay make a big contribution to shale anisotropy and it has a great effect on elastic properties. Hence we propose a double scan procedure in order to take clay lamination into consideration during S wave velocity prediction. In summary, we firstly propose a shale rock physics model for shale reservoir, and we introduce a new parameter (CL), the standard deviation of the distribution function, to model the degree of lamination of clay. Then we introduce a double scan procedure to inverse the CL and pore aspect ratio simultaneously which can be used to evaluate the lamination situation and pore geometry of target zone. And the predicted S wave velocity coincides well with measured data from Southwest China.
Published Version
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