Compatibility rock physics modeling method

Abstract

The invention provides a compatibility rock physics modeling method and belongs to the oil and gas earth physics field. According to the method, synchronous inversion of various model parameters is carried out on the basis of all logging curve constraints; a rock physics model is taken as a base, a logging longitudinal wave speed or transverse wave speed and a density are taken as constraint conditions, shale content, porosity and water saturation acquired through routine logging calculation are taken as parameters of an initial model, inversion of the shale content, the porosity and the water saturation is carried out, rock physics modeling is further carried out on the basis of inversion of the shale content, the porosity and the water saturation; parameters of each type of models comprise the shale content, the porosity and the water saturation. The method facilitates to improve well-seismic correlation, facilitates to improve lithology and fluid prediction precision, facilitates to analyze relations between the longitudinal / transverse wave speeds, and seismic wave frequency dispersion and energy attenuation, and further facilitates to determine uncertain parameters in a calculation process of reservoir porosity, saturation and the shale content.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysics, and in particular relates to a compatible rock physics modeling method. Background technique [0002] The rock physical model is the basis for extracting parameters such as lithology, porosity and fluid composition from seismic data, and is the basis for studying the relationship between seismic response characteristics and rock elastic parameters, velocity, density and fluid. [0003] The main purpose of petrophysical research is to clarify the effects of lithology, porosity, pore pressure, fluid type, saturation, anisotropy, temperature and frequency on compressional and shear wave velocities and seismic wave attenuation. The relationship between seismic wave velocity and such important reservoir parameters is now well understood. Experimental studies such as Johnston&Toksoz (1981), Nur&Wang (1988), Wang&Nur (1992) reveal the influence of various factors on speed. Tao&King (1993) and Tao...

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Problems solved by technology

The relationship between these parameters and the petrophysical model of the calculated seismic velocity and density is not considered uniformly, which leads to the fact that no matter how the elastic parameters of each component are changed in the petrophysical simulation, the calculation results of the model cannot be guaranteed to be consistent with those of the rock physics model. All measured curves can be matched

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