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A Well Seismic Calibration Method

A well-seismic calibration and standard layer technology, applied in the field of seismic data interpretation in seismic exploration, can solve the problem of low precision and achieve the effect of eliminating spatial errors

Active Publication Date: 2021-06-04
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a well seismic calibration method, which is used to solve the problem of low accuracy of the existing well seismic calibration method

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  • A Well Seismic Calibration Method

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Embodiment Construction

[0029] The present invention is further described below:

[0030] This well seismic calibration method:

[0031] 1. Prepare seismic imaging data, logging interpretation data, seismic interpretation standard horizon data and logging interpretation standard horizon data according to the required work area and logging quantity.

[0032] 2. Select strata with strong event continuity and stable sedimentary characteristics from the interpretation scheme as the top and bottom standard beds respectively.

[0033] 3. Calibration and quality control of the top standard layer:

[0034] The specific steps are:

[0035] a Linearly fit all acoustic logging velocity curves in the work area, and calculate the fitting velocity value v of each well at the top standard layer position according to the fitting curve;

[0036] b According to the fitted velocity value, use the conventional time-depth conversion method to calculate the time value t1 of each well at the position of the top standard...

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Abstract

What the present invention relates to is a kind of well seismic calibration method, and it comprises: 1, seismic data and log data preparation; 2, select top and bottom standard layer based on seismic interpretation scheme; Standard layer calibration and quality control; 5. Establish velocity field based on the calibration results of the top and bottom standard layers; 6. Generate synthetic seismic records and carry out well-seismic interlayer sub-layer calibration. The present invention takes the top and bottom reference layers as constraints, uses acoustic wave velocity instead of acoustic wave conversion to synthesize seismic record velocity between layers, uses average velocity fitting and trend surface to remove low-frequency effects and other means to eliminate spatial errors, and obtains accurate top-bottom and standard inter-layer velocities. The invention can make up for the time and waveform mismatch problems between well information and seismic data, reduce the influence of lateral heterogeneity on well calibration speed extrapolation, and has important application value for oil and gas resource exploration.

Description

Technical field: [0001] The invention relates to the technical field of seismic data interpretation in seismic exploration, in particular to a well seismic calibration method. Background technique: [0002] At present, structural interpretation and reservoir prediction using seismic and well logging data has become a must for fine reservoir description. However, the longitudinal scale of well logging data is depth, while the seismic profile is time scale. Therefore, to carry out fine reservoir description, the well-seismic calibration between well logging data and seismic data must be carried out first. [0003] The existing well-seismic calibration method is based on the correlation between synthetic seismic records and side-hole seismic trace waveforms. There are two main problems. One is that there are differences in time and waveform between well information and seismic data. The velocity is measured in the depth domain, and the velocity is the vertical velocity near th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30G01V1/36G01V1/40
CPCG01V1/28G01V1/303G01V1/36G01V1/40
Inventor 吴吉忠柳波赵小青贾善坡石颖王维红
Owner NORTHEAST GASOLINEEUM UNIV
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