Transverse isotropy stratum elastic coefficient well logging calculation method and device

Abstract

The invention relates to a transverse isotropy stratum elastic coefficient well logging calculation method and device. The method comprises the steps that coring in different directions is carried out on a rock core, and a rock core sample is obtained; the rock core sample is measured, the longitudinal wave speed and the transverse wave speed of the rock core sample are obtained, and elastic coefficients C11, C13, C33, C44 and C66 are obtained by calculation of the longitudinal wave speed and the transverse wave speed; the elastic coefficients C33, C44 and C66 are obtained through array acoustic logging data and density logging data of a coring well; a combination relational expression between the measurable logging elastic coefficients C33, C44 and C66 and the unmeasurable logging elastic coefficients C11 and C13 is built by the utilization of the elastic coefficients C11, C13, C33, C44 and C66 obtained by calculation of the longitudinal wave speed and the transverse wave speed; the elastic coefficients C33, C44 and C66 obtained through the array acoustic logging data and the density logging data of the coring well are substituted to the combination relational expression, the unmeasurable logging elastic coefficients C11 and C13 are obtained, and finally the elastic coefficients representing the transverse isotropy stratum are obtained.

Description

technical field [0001] The invention relates to the field of well logging and engineering technology in petroleum exploration and development, in particular to a well logging calculation method and device for the elastic coefficient of a transversely isotropic formation. Background technique [0002] The isotropic model is mainly used in conventional reservoir elastic property evaluation. With the continuous development of oil and gas exploration and development, unconventional oil and gas such as tight gas, shale gas, coalbed methane, and tight oil have shown great potential under economic and technical conditions, and global oil and gas resources will usher in a second expansion. Exploration targets are becoming more and more complex, reservoir heterogeneity is becoming stronger and stronger, and unconventional reservoirs generally have transverse isotropy. The so-called transverse isotropy is characterized by consistent properties in the layered plane and different prope...

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Problems solved by technology

Predecessors have carried out some experimental research on the elastic properties of mud and shale (see "Sound Velocity Anisotropy of Mudstone and Shale and Its Influencing Factors" by Deng Jixin, Shi Ji, etc., in the "Journal of Geophysics" in September 2004. "Analysis", which recorded the systematic experimental research on the elastic properties of mud and shale), and also discussed the method of calculating the elastic coefficient in theory (see "Acta Petroleum Sinica" in January 1999, Wang Yuezhi, Li Zijun's "Study on In-situ Stress in Transversely Isotropic Formation", which records the derivation of the elastic coefficient of transversely isotropic formation), but none of them combined the core experiment with the logging data, let alone using the logging data Carrying out the study of continuous depth calculation of elastic coefficient

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