Anisotropic petrophysical calibration method based on shale crystal geometrical factor orientation function

Abstract

The invention discloses an anisotropic petrophysical calibration method based on a shale crystal geometrical factor orientation function. The core of the method is to use multiple anisotropic petrophysical models in combination of the crystal geometrical factor function. The method, based on multiple disciplines such as petrophysics, crystallography, mathematical modeling and like, converts well logging and core data to P-wave and S-wave velocity models and solves the problem of simulation of equivalent velocities in underground anisotropic media.

Description

technical field [0001] The invention relates to a deep shale oil and gas geophysical exploration technology and method in the field of petroleum and geophysics. The specific technology is to obtain the strongly anisotropic shale velocity based on the anisotropic rock physics model of the shale crystal geometric factor orientation function The method of the model. Background technique [0002] The rock physical model (mud content, porosity, saturation, etc.) is a bridge between logging and seismic data (amplitude, impedance, reflection coefficient, etc.), and it abstracts the physical and chemical relationship between the two parameters into Mathematical models are very important tools in geophysical exploration. Because the logging parameters are detailed, but only single-point data. Seismic data has a wide range, but there are interference factors such as noise, surface undulation, and multiple waves in the data, and it needs to be interpreted before it can be used, and t...

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Problems solved by technology

However, in the current development of shale gas, these models will produce large errors, resulting in misalignment of well seismic data, etc., making it lose its role as a bridge. The reason is that the rock physical properties of the underground medium will cause seismic waves The propagation direction deflection of , that is, the seismic wave anisotropy

Previous rock physics ignored this phenomenon and considered that the subsurface medium is isotropic, but there will be strong earthquakes in the case of underground natural spaces (cracks, pores, caves, etc.) and their filling fluids and strong anisotropic matrix Anisotropy, which contradicts the assumptions of the original mathematical model

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