Rock core feature size determination method and device

Abstract

The invention provides a rock core feature size determination method and device applied to the field of data processing. The method comprises steps of obtaining a plurality of rock core numerical models with different diameters, and obtaining compressive strength through simulation, the sizes of all gravels in the rock core numerical models being a preset circular fixed particle size; establishing a fitting function of the relation between the rock core diameter and the compressive strength according to the compressive strength of the rock core numerical models with different diameters; and calculating the characteristic size of the rock core under the circular fixed particle size through the fitting function; obtaining the characteristic compressive strength corresponding to the rock core sample entity under the characteristic size. Therefore, during conglomerate stratum coring and field conglomerate core drilling sampling in the later period, the process is simplified; according to the characteristic size, core drilling sampling is carried out, a rock mechanics experiment is carried out, the obtained rock compressive strength is irrelevant to the conglomerate sample size, the compressive strength under the specific particle size in the actual stratum can be represented, the experiment workload of geologists is effectively reduced, and more reliable rock mechanics parameters are obtained.

Description

technical field [0001] The present application relates to the field of data processing, in particular to a method and device for determining the characteristic size of a rock core. Background technique [0002] The mechanical parameters of the conglomerate in the geological layer are important basic data in engineering construction. The conventional method of obtaining the mechanical parameters of the geological layer is to core the reservoir, and then drill the rock sample on the full-diameter core, and perform rock mechanics analysis on the rock sample. Test to obtain the strength parameters and elastic parameters of the reservoir rock. This method of obtaining the mechanical parameters of conglomerate in the geological layer is feasible for sandstone and mudstone with good homogeneity, but it has great limitations for conglomerate with complex structure, mainly because the gravel in conglomerate causes The strength of conglomerate has a strong size effect, and the mechan...

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Problems solved by technology

This method of obtaining the mechanical parameters of conglomerate in the geological layer is feasible for sandstone and mudstone with good homogeneity, but it has great limitations for conglomerate with complex structure, mainly because the gravel in conglomerate causes The strength of conglomerate has a strong size effect, and the mechanical parameters obtained through small-sized rock samples are not only inconsistent with the mechanical parameters of the actual geological layer, but also have a very strong discreteness.

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