Optimizing amplitude inversion utilizing statistical comparisons of seismic to well control data

A seismic data and inversion technology, applied in the direction of seismic signal processing, etc., can solve the problems of suboptimal parameter selection, uncertainty and error can not be compensated, lack and so on

Inactive Publication Date: 2010-03-24
CHEVROU USA INC
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Problems solved by technology

Such post-inversion analysis does not introduce additional uncertainties and errors often cannot compensate for inappropriate processing
[0094] In conclusion, as mentioned above, there are several disadvantages in conventional seismic processing and magnitude inversion
The first disadvantage is that the magnitude processing and inversion sequence may be suboptimal due to poor parameter selection, which results in subopti

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  • Optimizing amplitude inversion utilizing statistical comparisons of seismic to well control data
  • Optimizing amplitude inversion utilizing statistical comparisons of seismic to well control data
  • Optimizing amplitude inversion utilizing statistical comparisons of seismic to well control data

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[0134] The present invention overcomes many of the disadvantages described in the background section. A general overview of the invention is shown in Figure 11 . Differences between statistics measured from well control and from inverted seismic data can be minimized by means of selection of well record processing, seismic processing, and inversion parameters. The invention is achieved by using experimental inversion of seismic data over a range of possible parameters in multiple processing steps. Statistical properties (SC) as a function of correlation coefficients and root mean square (RMS) levels or alternatively cross-correlation and autocorrelation values ​​between inverted reflectivity sets are used to measure "goodness" for selected parameters. or Statistical Distance Measure (SDM) (SDM is a measure of the difference in the statistical properties of the inverted seismic data and well data). Those parameters that lead to an inverted reflectivity with a statistic that...

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Abstract

A method for obtaining enhanced seismic data and optimized inverted reflectivities includes computing statistical well characterizations based upon band-limited well reflectivities for a subsurface region. Sets of processed seismic data are computed by applying differing processing sequences to seismic data corresponding to the subsurface region. Inverted reflectivities are computed by inverting the sets of processed seismic data. Statistical seismic characterizations are computed based upon the inverted reflectivities. Statistical difference measurements (SDMs) are computed between the statistical well and seismic characterizations. An optimal processing sequence is selected based upon the computed SDMs. Enhanced seismic data is obtained by processing the seismic data corresponding to thesubsurface region. An optimal seismic inversion algorithm is obtained based upon the computed SDMs. The seismic data is inverted using the optimal seismic inversion algorithm to produce a set of optimized inverted reflectivities.

Description

technical field [0001] The present invention relates generally to seismic detection of subsurface formations, and more particularly to the use of well control data to improve the quality of seismic processing and amplitude inversion. Background technique [0002] During the last 25 years, the oil and gas industry has sought to derive more information about subsurface properties from seismic data—especially detailed information about subsurface pore flow, porosity, facies, pressure, and geometry. This is accomplished in part by using the seismic data in combination with well log information to improve the accuracy of subsurface properties estimated from the seismic data. These efforts are rewarded by improved exploration success rates and selection of "sweet spots" for development wells. This success is largely based on the recovery of the relative acoustic impedance (the product of the change in density and compression velocity at the interface). [0003] Figure 1 shows a ...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/28
Inventor J·沃施伯尔尼E·F·赫尔肯霍弗
Owner CHEVROU USA INC
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