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Method for estimating stratum medium quality factors based on seismic signal envelope peak

A quality factor, seismic signal technology, used in the field of seismic surveying

Inactive Publication Date: 2014-04-16
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

However, this method still does not solve the following problems: 1. How to estimate the wavelet parameters with high precision in WEPIF; 2. The optimal choice of parameters in the three-parameter wavelet

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  • Method for estimating stratum medium quality factors based on seismic signal envelope peak
  • Method for estimating stratum medium quality factors based on seismic signal envelope peak
  • Method for estimating stratum medium quality factors based on seismic signal envelope peak

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] The invention provides a method for estimating medium quality factor based on seismic signal envelope peak value, and a seismic survey method for estimating medium quality factor by using VSP (vertical seismic profile) data based on the change of instantaneous frequency at the seismic signal envelope peak value. It includes the following steps:

[0039] 1) Divide the medium into several thin plates with the distance between two adjacent geophones in the well as the thickness.

[0040] Such as figure 1 As shown, the top and bottom of the rectangle are two adjacent geophones, and the distance between the two adjacent geophones is used as the thickness to divide the medium into N small thin plates according to the direction indicated by the depth, where N is a natural number.

[0041] 2) For the i-th small plate, the direct wave received at the ...

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Abstract

The invention relates to a method for estimating stratum medium quality factors based on a seismic signal envelope peak. The method comprises the steps that 1) media are divided into a plurality of small sheets with the distance between two adjacent detectors as a thickness; 2) constant phase wavelets are used for approaching direct waves received by the top of the ith small sheet, and seismic wavelet parameters are estimated through a high-order cumulant matching method based on MSMG; 3) the parameters of a wavelet transform kernel function are estimated through the high-order cumulant matching method based on the MSMG; 4) the signal receiving instantaneous frequency of the upper interface and the lower interface of the ith small sheet is calculated; 5) the changes of envelope peak instantaneous frequency in the ith small sheet are calculated; 6) the quality factor Q value of the ith small sheet is calculated; 7) the steps 2)-6) are repeated, the quality factors of the other N-1 small sheets except the ith small sheet are calculated in sequence; 8) the oil-gas possibility of a reservoir stratum is forecast through the quality factor Q values, obtained in the step 6) and the step 7), of thee N small sheets, and then an estimated attenuation curve is obtained.

Description

technical field [0001] The invention relates to the field of seismic survey, in particular to a method for estimating the quality factor of formation medium based on the peak value of the envelope of the seismic signal. Background technique [0002] During the propagation of seismic waves underground, due to the viscoelasticity of the formation, seismic waves will be absorbed, resulting in amplitude attenuation and velocity dispersion. The magnitude of seismic attenuation is generally measured by the quality factor Q value of the formation. The laboratory and actual data measurement results show that the quality factor Q value is related to factors such as rock properties, fluid properties and fluid saturation. Therefore, the quality factor Q value is an effective tool for reservoir identification and hydrocarbon detection. In addition, the quality factor Q value can better explain the effect of AVO (Amplitude Versus Offset, the change of amplitude with offset), improve th...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 赵伟高静怀赵静杨森林姜秀娣翁斌朱振宇陈剑军印海燕王清振刘志鹏丁继才江南森
Owner CHINA NAT OFFSHORE OIL CORP
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