Method for obtaining transverse wave time difference section through logging and core data

Abstract

The invention discloses a method for obtaining a transverse wave time difference section through logging and core data. The method comprises the following steps that (A) a target well is layered and sectioned according to lithologic characteristics; (B) the logging data of the target well and the core rock mechanical testing data of a corresponding target well section of the target well or each well adjacent to the target well are prepared; (C) the data are collated, and an observation input matrix, parameter column vectors and output column vectors are built; (D) a cubic Householder matrix isbuilt, and the observation input matrix and the output column vectors are subjected to cubic transformation; (E) a linear system of equations is built according to the transformed observation input matrix and the output column vectors, and the parameter column vectors are solved; and (F) the transverse wave time difference section of the target well is calculated according to the logging data. The method is specific to a horizontal well or a directional well which is lack of transverse wave time difference data, according to the logging data and the core rock mechanical testing data, the transverse wave time difference section of the target layer section is predicted accurately, the ill-conditioned problem in the solving process can be solved, the basis is provided for obtaining mechanical parameters subsequently, and exploiting of the target well is promoted.

Description

technical field [0001] The invention relates to the field of oil and gas well exploitation, in particular to a method for predicting the shear wave time-difference profile according to the logging data of the target well and the core rock mechanics test data of the target well or its adjacent wells. Background technique [0002] Oil and gas wells need to use many rock mechanical parameters as the design basis in a series of construction designs such as drilling and completion, segmented layering, and hydraulic fracturing. Among them, the vertical and horizontal acoustic time difference plays an indispensable role in the acquisition of rock mechanical parameters. , which are obtained mainly from well logging data of oil and gas wells and rock mechanics test data of the block where the oil and gas wells are located. The P-wave transit-time profile can be obtained by traditional acoustic transit-time logging, which is low in cost and easy to obtain. However, traditional acousti...

AI Technical Summary

Problems solved by technology

However, the practical application effect of many methods is limited due to factors such as hard-to-obtain parameters or more experience and limited applicable objects. There is an urgent need for a shear-wave transit-time prediction algorithm that is suitable for general reservoirs and meets the accuracy requirements.

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