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A method and system for impedance inversion based on model constraints

A technology of inversion and model, applied in the field of petroleum geophysical exploration

Active Publication Date: 2015-11-04
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Therefore, using these two techniques separately for the final restored impedance often suffers from the problem of choosing two sets of regularization strategies and experimenting with two sets of parameters

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  • A method and system for impedance inversion based on model constraints
  • A method and system for impedance inversion based on model constraints
  • A method and system for impedance inversion based on model constraints

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[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] Seismic data interpolation and seismic wave impedance inversion belong to two categories of seismic data processing and interpretation. These two steps are independent and connected in series. Due to the ill-posed problem of inversion, regularization constraints need to be added to conventional seismic data interpolation methods and conventional impedance inversion methods at this stage. Independent implementation of seismic data interpolation and imped...

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Abstract

The invention provides a model constraint based impedance inversion method and a model constraint based impedance inversion system. The model constraint based impedance inversion method includes: acquiring log data, seismic data and acquisition matrixes of a current stratum; extracting seismic interpretation data from the seismic data; building an initial impedance model according to the log data and the seismic interpretation data; estimating seismic wavelets according to the log data and the seismic data; confirming objective function according to relationship between acoustic wave impedance and reflectance and sampling relationship when seismic traces are missing; confirming impedance sections or impedance objects of the current stratum according to the initial impedance model, estimated seismic wavelets and the objective function; and comprehensively interpreting the impedance sections and the impedance objects to acquire reservoir prediction results of the current stratum. Through model regularization, seismic data interpolation and seismic wave impedance inversion are combined organically, so that the seismic data interpolation and the seismic wave impedance inversion can be realized simultaneously.

Description

technical field [0001] The present invention relates to the technical field of petroleum geophysical exploration, in particular to the inversion technology of seismic and well logging data, specifically a method and system for impedance inversion based on model constraints. Background technique [0002] In the field of petroleum geophysical exploration technology, seismic data interpolation is a necessary preprocessing link in the process of seismic data processing. At present, there are mainly two types of methods to realize seismic data interpolation. One is the mathematical method based on signal recovery. From the perspective of signal analysis, this type of method uses the characteristics of seismic signals, such as the spatial continuity of the phase axis, to complete the interpolation of seismic data through signal reconstruction technology. Another type of method is to complete the seismic data interpolation through some assumptions about the underground medium accor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 袁三一孙文举晏丰施佩东王尚旭
Owner BC P INC CHINA NAT PETROLEUM CORP
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