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Post-stack seismic inversion method

A seismic inversion and inversion technology, applied in seismic signal processing and other directions, can solve the problems of lack of background trend of inversion results, poor horizontal continuity of inversion results, and inability to effectively expand.

Inactive Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

It overcomes the defects that the commonly used seismic inversion method cannot compensate the low-frequency components in the work area, resulting in poor lateral continuity of the inversion results and the lack of effective background trends in the inversion results, making it impossible to effectively develop in subsequent reservoir predictions.

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Embodiment Construction

[0090] The present invention will be further described below in conjunction with accompanying drawing.

[0091] refer to figure 1 , this application proposes a post-stack seismic inversion method, including the following steps:

[0092] S1. Constructing seismic data fitting difference term;

[0093] S2. Construct model trend constraint items;

[0094] S3. Combining the model trend constraint term and the seismic data fitting difference term, establish the objective function of the base tracing inversion;

[0095] S4. Obtain the wave impedance from the inversion objective function through a basis-tracking decomposition algorithm.

[0096] As a further improvement to this method, refer to figure 2 , the step S1 specifically includes:

[0097] S11. Obtain the maximum temporal thickness of the thin layer according to the seismic wave velocity and the main frequency of the seismic wave, and obtain a reflection coefficient decomposition matrix according to the maximum temporal...

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Abstract

The invention provides a post-stack seismic inversion method. The method includes the following steps that: S1, a seismic data fitting difference term is constructed; S2, a model trend constraint termis constructed; S3, the model trend constraint term and the seismic data fitting difference term are combined so as to construct a base tracking inversion-based objective function; and S4, wave impedance is obtained from the inversion objective function through a base tracking decomposition algorithm. With the post-stack seismic inversion method of the invention adopted, the problem of failure torealize effective development of a commonly used seismic inversion method caused by the poor lateral continuity of an inversion result and the lack of an effective background trend of the inversion result which are further caused by failure to compensate the low-frequency component of a work area can be solved.

Description

technical field [0001] The invention relates to the technical field of seismic data interpretation and inversion in oil and gas exploration, in particular to a post-stack seismic inversion method. Background technique [0002] Seismic inversion technology can convert the information of the reflection interface into the information inside the reservoir, so it can reveal the physical properties and oil and gas properties of the reservoir more intuitively. However, due to the band-limited nature of seismic data, seismic inversion is an "ill-conditioned problem". By adding appropriate constraints, the stability can be effectively improved. [0003] Conventional seismic inversion usually starts from the reflection coefficient of the seismic interface, and optimizes the objective function under the constraint of minimizing the Lp norm or the constraint that the reflection coefficient obeys the "long tail" distribution. However, conventional seismic inversion cannot break through ...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 张丰麒盛秀杰彭成
Owner CHINA PETROLEUM & CHEM CORP
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