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Reservoir hydrocarbon prediction method based on analysis of prestack instantaneous frequency properties

A technology for instantaneous frequency and attribute analysis, applied in the field of petroleum geophysical exploration, it can solve problems such as phase reversal and bright spot anomalies, and achieve the effects of reducing interpretation errors, good anti-noise performance, and improving resolution and hydrocarbon prediction accuracy.

Inactive Publication Date: 2015-05-06
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For quite a long period of time, amplitude attributes and AVO characteristics are important information for interpretation of seismic data. However, in actual formations, due to the difference in the medium parameters of the overlying and underfloating formations, the AVO anomalies displayed by gas-bearing sandstones are also different. Similarly, in addition to abnormal bright spots, there are also features such as dark spots and phase inversion, which lead to the problem of ambiguity in practical application of data information based on amplitude attributes

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  • Reservoir hydrocarbon prediction method based on analysis of prestack instantaneous frequency properties
  • Reservoir hydrocarbon prediction method based on analysis of prestack instantaneous frequency properties
  • Reservoir hydrocarbon prediction method based on analysis of prestack instantaneous frequency properties

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Embodiment 1

[0037]A reservoir hydrocarbon prediction method based on the analysis of pre-stack instantaneous frequency attributes of the present invention first performs windowing processing on pre-stack seismic signals to eliminate the influence of interference waves on effective signals; Obtain the instantaneous frequency attribute of the seismic signal and its change information with the offset, and obtain the FVO curve (FVO--Frequency Versus Offset frequency with the offset) through the instantaneous frequency attribute of the seismic signal and its change information with the offset; Rotate each FVO curve 90° clockwise, then arrange the FVO curves of multiple gathers together in order after rotation, and hang them on a target storage layer to obtain the pre-stack offset volume based on the instantaneous frequency attribute; Combining the model and logging data, we found the change characteristics related to oil and gas; in the pre-stack offset volume based on instantaneous frequency, ...

Embodiment 2

[0039] A reservoir hydrocarbon prediction method based on pre-stack instantaneous frequency attribute analysis of the present invention, the realization steps are as follows:

[0040] (1) Using artificial excitation and recording seismic waves by geophones, obtaining original pre-stack seismic data, denoising and amplitude-preserving processing, extracting pre-stack seismic gathers and performing event leveling on them;

[0041] (2), obtain the complex seismic channel signal X(t)=f(t)+ih(t) by Hilbert transform, and then obtain the instantaneous frequency Pick the FVO curve of each CMP gather;

[0042] (3), rotate each FVO curve clockwise by 90°, at this time, the numerical direction is the offset of each CMP gather, and the horizontal direction is the instantaneous frequency information corresponding to the offset;

[0043] (4) Arrange the FVO curves of multiple CMP gathers after rotation and hang them on the target reservoir to obtain the pre-stack offset volume based on t...

Embodiment 3

[0046] A reservoir hydrocarbon prediction method based on pre-stack instantaneous frequency attribute analysis of the present invention is applied to pre-stack data interpretation of a three-layer formation model based on a high-density observation system. The specific steps are as follows:

[0047] (1) There are four regions in the three-layer formation model based on the high-density observation system, region 1 P-wave velocity Vp=4600m / s, shear-wave velocity Vs=Vp / 2, density ρ=2.2g / cm 3 , quality factor Q=100; Vp=4500m / s in zone 2, s=Vp / 2, density ρ=2.2g / cm 3 , quality factor Q=80; Vp=4200m / s in area 3, s=Vp / 2, density ρ=2.0g / cm 3 , the quality factor Q=20, the medium parameters in area 4 are the same as those in area 1;

[0048] (2) The model has a 600m long and 50m thick hydrocarbon anomaly area in the middle of the depth of 2500m, that is, area 3; in order to obtain pre-stack seismic records that can reflect the real geological conditions of the formation, 91 excitation...

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Abstract

The invention discloses a reservoir hydrocarbon prediction method based on analysis of prestack instantaneous frequency properties, and belongs to the technical field of geophysical prospecting for petroleum. According to the technical scheme, the reservoir hydrocarbon prediction method comprises the following steps of performing windowing processing on prestack seismic signals; acquiring instantaneous frequency properties of the seismic signals through Hilbert transform by using a complex seismic trace technology and change information of the instantaneous frequency properties along with offset; rotating each FVO curve clockwise at an angle of 90 degrees; sequentially arraying the FVO curves of a plurality of gathers together after the gathers rotate; hanging the arrayed FVO curves on an objective reservoir position to obtain a prestack offset body based on the instantaneous frequency properties; finding out change features relevant to oil gas according to a model and logging information; and predicting hydrocarbon of a reservoir. In the prestack offset body based on instantaneous frequency, the instantaneous frequency value of a hydrocarbon abnormal region is obviously smaller than the instantaneous frequency value of a hydrocarbon normal region, and is reduced along with increasing of offset. By the reservoir hydrocarbon prediction method based on analysis of the prestack instantaneous frequency properties, interpretation errors are reduced, and the hydrocarbon prediction precision is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a reservoir hydrocarbon prediction method based on pre-stack instantaneous frequency attribute analysis. Background technique [0002] Seismic data interpretation is an important part of seismic data processing. It converts seismic data into our understanding of the underground geological conditions in the exploration area, and finds information related to oil and gas. For quite a long period of time, amplitude attributes and AVO characteristics are important information for interpretation of seismic data. However, in actual formations, due to the difference in the medium parameters of the overlying and underfloating formations, the AVO anomalies displayed by gas-bearing sandstones are also different. Similarly, in addition to abnormal bright spots, there are also features such as dark spots and phase inversion, which lead to the problem of ambiguity in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 高亚力
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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