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Frequency division fusion wave impedance inversion method

A wave impedance inversion and inversion technology, applied in the field of seismic data inversion, can solve problems such as the inability to accurately reflect the distribution characteristics of reservoirs, and achieve the effect of expanding the frequency band.

Active Publication Date: 2018-12-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide a frequency division fusion wave impedance inversion method, so as to solve the problem that the existing inversion method cannot accurately reflect the distribution characteristics of the reservoir in oil and gas areas with thin reservoirs and rapid lateral changes

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Embodiment

[0033] Fluvial reservoirs are developed in the exploration area. Due to shallow burial, poor compaction and cementation, sandstone reservoirs generally have high porosity, thin reservoirs, small scale, and rapid lateral changes. Since the velocity and density of the reservoir section are lower than those of the surrounding rock and mudstone, the low wave impedance value can be used to identify the reservoir. The following describes in detail the use of frequency division fusion technology to identify thin, small-scale and fast laterally changing reservoirs in the exploration area.

[0034] The frequency division fusion wave impedance inversion method of this embodiment is aimed at the above-mentioned exploration area, and the flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0035] 1) Obtain the seismic horizon by interpreting the seismic data in the exploration area, use the seismic horizon to establish the geological framework, constrain the wa...

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Abstract

The invention relates to a frequency division fusion wave impedance inversion method. According to the method, conventional well logging constraint model inversion is carried out through initial seismic data and well logging data of multiple drills, and an inversion result of the well logging constraint model is obtained; the inversion result of the well logging constraint model is used as an initial model, high-resolution inversion is carried out under the constraint of tuning frequency, and a high-resolution inversion result is obtained; and the well logging constraint model inversion resultand the high-resolution inversion result are subjected to frequency division band combination, and a frequency division fusion inversion result is obtained. By virtue of the method, the vertical resolution is improved on the basis of inversion of the well logging constraint model, and the accuracy of model inversion is kept; by virtue of the high-resolution inversion result of the seismic tuningfrequency constraint, the uncertainty of the well logging data high-frequency information in the transverse interpolation value is reduced; and frequency division fusion is carried out on the well logging constraint model inversion result and the high-resolution inversion result, so that wave impedance data which are relatively high in vertical resolution and accurate in transverse change can be provided for an oil gas area which is relatively thin in stratum and relatively fast in transverse change.

Description

technical field [0001] The invention belongs to the field of seismic data inversion, and in particular relates to a frequency division fusion wave impedance inversion method. Background technique [0002] In the field of petroleum exploration and development technology, wave impedance inversion is to use the inversion algorithm to convert the seismic profile into a wave impedance profile with high resolution and high precision, so as to reveal the characteristics of underground target layers (reservoirs, oil and gas layers, etc.) Spatial geometry and microscopic features. Compared with the seismic section, the wave impedance profile can be more directly related to the underground lithology information, and the response to the reservoir is more obvious, which plays an important role in the prediction and identification of the reservoir. [0003] Logging constrained model inversion technology is one of the most widely used and effective inversion methods at present. This met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 张新超张弛黎腾严永新王勇谢启李艳然
Owner CHINA PETROLEUM & CHEM CORP
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