Stability Inversion Prediction Method for Carbonate Fractured Reservoirs Based on Orthogonal Anisotropy:A Case Study of Halahatang Area of Tarim Basin
YANG Meichun
CAI Quan
ZHANG Chi
YAN Ting
LI Jie
LIAO jian
DONG Hao
Abstract：Prestack elastic impedance inversion is one of the inversion methods for estimating elastic parameters and anisotropic parameters of reservoirs.However,as the complexity of the medium increases,the stability of the inversion results decreases.In this paper,a carbonate reservoir with a set of vertical orthogonal directional fractures was equivalent to an orthotropic(OA)medium.The wide-azimuth seismic data of carbonate fractured reservoirs were used to study a stable inversion method suitable for fracture prediction in carbonate reservoirs,so as to improve the inversion stability of fractured reservoirs.First,the PP wave elastic impedance expression for OA medium was derived.The equation was reduced from nine independent parameters to three parameters to be inverted,which lowered the contribution of different independent parameters to the reflection coefficient.Then,the elastic impedance inversion method based on Bayesian theory was adopted to improve the stability of the inversion algorithm.Under different noise conditions,the proposed elastic impedance inversion method for OA medium was tested in models and applied in actual work areas.The application results show that the fractured reservoir prediction method in this paper has a consistency rate of more than 90%with the actual drilling and logging,which verifies the reliability of the method in this paper in predicting fractures in carbonate reservoirs.
Keywords：Elastic impedance inversionFraction reservoirOA mediumBayesian theory
Publication Date：2025-06-30
Online Publishing Date：2025-08-25(First online date of this platform, not the publication date of the document)
Pages：9( 192-200 )