Method for obtaining rock matrix bulk modulus

Abstract

The invention provides a method for obtaining a rock matrix bulk modulus. The method comprises: (A), an equivalent rock matrix bulk modulus of a target logging depth point is determined according to logging information of the target logging depth point and a preset number of logging depth points adjacent to each other in an up-down mode; (B), a changing interval and a changing increment of a dry rock poisson ratio of the target logging depth point are determined; (C), a changing interval and a changing increment of the ock matrix bulk modulus of the target logging depth point are determined; (D), inversion is carried out by using an adaptive matrix mineral modulus inversion method on the condition of double convergence so as to obtain an optimum adaptive rock matrix bulk modulus of the target logging depth point; and (E), average processing is carried out on the equivalent rock matrix bulk modulus and the optimum adaptive rock matrix bulk modulus of the target logging depth point to obtain a rock matrix bulk modulus of the target logging depth point. With the method, a rock matrix bulk modulus with high precision and stability can be obtained; and a favorable foundation is laid for follow-up oil and gas reservoir prediction.

Description

technical field [0001] The present invention relates generally to the field of rock physics, and more particularly to a method for obtaining the bulk modulus of a rock matrix. Background technique [0002] With the improvement of the degree of oil and gas exploration, my country has entered the stage of exploration of stratigraphic and lithological reservoirs on land, in which the petrophysical parameter model plays an important role as a bridge in the exploration of reservoirs: the petrophysical parameter model can effectively explain earthquake Linked with the characteristic parameters of oil and gas reservoirs, for example, the basic criteria established through the analysis of petrophysical parameter models can be quantitatively or semi-quantitatively derived from seismic data. degree, pore structure characteristics, etc.), and the oil and gas reservoirs can be predicted by the above characteristic parameters. Therefore, the study of rock physics is the physical basis for...

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Problems solved by technology

[0011] The purpose of the exemplary embodiment of the present invention is to provide a method for obtaining the bulk modulus of the rock matrix, so as to overcome the difficulty in obtaining the bulk modulus of the rock matrix accurately and conveniently in the prior art, and the obtained bulk modulus of the rock matrix has low accuracy and poor stability

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