Three-dimensional seismic data fault enhancement processing method

A 3D seismic and enhanced processing technology, applied in the direction of seismic signal processing, etc., to improve the accuracy of fault identification, resolve cross-section information and enhance the continuity of horizons

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

[0014] The present invention proposes a fault enhancement processing method for 3D seismic data, which can combine diffusion filter processing and median filter processing, improve fault identification accuracy, and solve the problems of section information and horizon continuity enhancement

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Embodiment Construction

[0033] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0034] figure 1 A flow chart showing the steps of the fault strengthening processing method for 3D seismic data according to the present invention.

[0035] The fault enhancement processing method for 3D seismic data according to the present invention may include:

[0036] Step 101, based on the seismic data volume, determine the time window range of the target layer, and preprocess the seismic data volume; determine the time window range of the target layer according to the syntheti...

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Abstract

The invention discloses a three-dimensional seismic data fault enhancement processing method. The method comprises steps: based on a seismic data volume, a time window range of a target stratum is determined, and the seismic data volume is preprocessed; the attributes of the seismic data volume are counted to calculate a structural guidance body; based on the structural guidance body and the seismic data volume, a seismic coherence cube in the time window range of the target stratum is calculated; based on the seismic coherence cube and the attributes of the seismic data volume, the coherencevalue of each piece of seismic data in the seismic data volume is acquired, and a threshold value is set; and in view of seismic data with the coherence value smaller than the threshold value, diffusion filter processing is adopted and a diffusion filter data volume is acquired, and in view of seismic data with the coherence value greater than the threshold value, median filter processing is adopted and a median filter data volume is acquired, and the diffusion filter data volume and the median filter data volume are integrated to acquire a fault enhancement data volume. Through combining thediffusion filter processing and the median filter processing, the fault recognition precision is improved, and the problem of continuous section information and horizon enhancement can be solved.

Description

technical field [0001] The invention relates to the fields of oil and gas exploration and structural geological investigation, and more specifically, to a fault strengthening processing method for three-dimensional seismic data. Background technique [0002] During the Early Tertiary in the Bohai Bay Basin and the Jurassic-Cretaceous (rifting period) in the Songliao Basin in eastern China, tectonic activities were intense, forming a large number of faults, which played an important role in controlling stratigraphic deposition, oil and gas migration, and structural traps. Function is the key descriptive element in oil and gas exploration. The Pterogene in the Bohai Bay Basin and the Jurassic-Cretaceous fault depression in the Songliao Basin are deeply buried, the seismic data frequency and signal-to-noise ratio are low, and the imaging results of breakpoints and sections are often poor. Especially during the rifting period of the Songliao Basin, tectonic movements were activ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 田建华曹少蕾李九生杨勤林董清源汪彩云
Owner CHINA PETROLEUM & CHEM CORP
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