Shale anisotropic rock physical model modeling method

Abstract

The invention discloses a shale anisotropic rock physical model modeling method. The shale anisotropic rock physical model modeling method comprises the steps that regarding a shale matrix as a mixture composed of brittle minerals, organic matters and clay; regarding clay particles as anisotropic elements with a fixed invariant elastic stiffness matrix, and introducing clay particle orientation indexes to represent the orientation arrangement degree of the clay particles; dividing shale total pores into brittle pores, clay pores and organic matter pores; obtaining elastic parameters of a mixture of porous brittle minerals and porous organic matters; calculating elastic parameters of the mixture of the brittle minerals and the organic matters; calculating elastic parameters of the pore claymedium containing bound water; solving equivalent elastic parameters of the shale matrix and a shale dry rock framework; and obtaining fluid saturated shale equivalent elastic parameters based on theshale matrix and the shale dry rock skeleton equivalent elastic parameters, and completing the construction of the shale anisotropic rock physical model in the fluid saturated state. According to themethod, the longitudinal and transverse wave velocity and anisotropy parameters of the shale can be predicted more accurately.

Description

technical field [0001] The invention belongs to the field of petrophysical model modeling, and more specifically relates to a shale anisotropic rock physical model modeling method. Background technique [0002] The microstructure of shale is relatively complex, and there are various factors affecting the elastic properties of shale. Complex mineral components, organic matter, directional arrangement of clay particles, and the development of micro-cracks will all affect the elastic properties of shale. Shale has typical strong anisotropy characteristics, which are difficult problems not encountered in conventional reservoir rock physics modeling. At present, there is no effective petrophysical model modeling method to describe the elastic properties of shale. [0003] Based on the research on the microstructure and anisotropy characteristics of shale, it is shown that the clay mineral content and its directional arrangement are the main factors for its anisotropy, such as th...

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Problems solved by technology

However, most domestic shale petrophysical models do not consider the orientation of clay minerals, adding clay minerals to the model as an isotropic medium, and do not consider the microstructural characteristics of shale.

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