Method for predicting reservoir layer inverted by multi-well logging parameter under restriction condition of relative wave impedance

Abstract

The invention discloses a method for predicting a reservoir layer inverted by multi-well well logging parameters under a restriction condition of relative wave impedance, comprising the following steps: (1) calculating a relative wave impedance value; (2) establishing an initial wave impedance model corresponding to a small layer to acquire reflection coefficients and seismic synthetic records; (3) fitting the seismic synthetic records and seismic records; (4) carrying out trace integral on the seismic synthetic records and the seismic records, equivalently shifting minus 90 degrees, and calibrating the layer of the initial wave impedance model to a trace integral section; (5) performing hour difference fine tuning; (6) calibrating and comparing the small layer of single-well data, and performing the physical research on deposition equivalence; (7) performing physical researches on a multi-well continuous sheet deposition phase and others to establish an initial deposition phase model; (8) selecting the most sensitive well logging parameters; (9) interpolating the multi-well in the entire region by using the cokriging technology and using the relative wave impedance as a restriction data body; and (10) loading the initial deposition phase model to an interpolated reservoir layer model (9) by means of interaction explanation to obtain a final reservoir layer model.

Description

technical field [0001] The invention relates to fine technical interpretation of seismic data in the petroleum physical exploration industry, and aims to solve the problem of reservoir prediction, in particular to a reservoir prediction method for multi-well logging parameter inversion under relative wave impedance constraints. Background technique [0002] Wave impedance inversion is a method of eliminating the influence of wavelets from the seismic section, leaving the reflection coefficient; and then calculating the physical parameter wave impedance that can reflect the change of formation physical properties from the reflection coefficient. There are many methods for wave impedance inversion, but essentially there are two methods: [0003] 1) Wave impedance inversion without well constraints. The frequency of wave impedance inverted under the constraint of no well is consistent with the frequency of seismic records, that is, the frequency of wave impedance inverted depe...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the main problems of conventional model-constrained wave impedance inversion, this invention provides a multi-well logging parameter inversion method under the relative wave impedance constraint to solve the problem of wave impedance stable and fast inversion under the conditions of complex geological structure and multiple wells. Inversion problems, reduce inversion multi-solutions, and improve prediction accuracy of complex reservoirs

Images