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Logging curve recovery method used for compact gas-containing sandstone reservoir prediction

A technology of logging curves and recovery methods, applied in the field of petroleum geophysical exploration, can solve problems such as inability to effectively solve geological problems in tight gas-bearing sandstone reservoirs

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] Aiming at the fact that conventional wave impedance inversion and gas-bearing detection technology cannot effectively solve the geological problem of predicting tight gas-bearing sandstone reservoirs, the present invention provides a logging curve recovery method for tight gas-bearing sandstone reservoir prediction. The method of the present invention Restoring the logging curve characterizing the characteristics of the reservoir, so that the restored logging curve has both the dimensional characteristics of the target curve and the high-frequency information of the curve to be restored

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  • Logging curve recovery method used for compact gas-containing sandstone reservoir prediction
  • Logging curve recovery method used for compact gas-containing sandstone reservoir prediction
  • Logging curve recovery method used for compact gas-containing sandstone reservoir prediction

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Embodiment Construction

[0068] Such as figure 1 As shown, a logging curve recovery method for tight gas-bearing sandstone reservoir prediction, the specific steps are as follows:

[0069] Step 1. Enter data:

[0070] That is, input the target logging curve AC and the recovery curve GR; the target logging curve AC is the longitudinal wave velocity logging curve, and the recovery curve GR is the natural gamma curve;

[0071] Step 2. Preprocess the input data:

[0072] For the sample point values ​​that have no physical meaning in the target logging curve AC and the to-be-recovered curve GR, take the average value of the upper and lower two sample points with physical meaning, and use this average value to replace the sample without physical meaning. Point value.

[0073] Step 3. Obtain the trend field factor LAC of the target logging curve AC:

[0074] Step 3-1, establish a least squares fitting equation, as shown in formula 1:

[0075] f ( a , b ) = X i = 1 n [ AC i - ...

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Abstract

The invention provides a logging curve recovery method used for compact gas-containing sandstone reservoir prediction. The recovery method is a method for obtaining a recovered curve, trend field factors are introduced to a target logging curve AC and a curve to be recovered GR, and high-frequency components of the target logging curve AC and the curve to be recovered GR are matched and integrated by using frequency spectrum integration technology, thereby obtaining the recovered curve which has dimension features of the target logging curve and keeps the high-frequency components. The logging curve recovery method used for compact gas-containing sandstone reservoir prediction provided by the invention relatively completely keeps features of the curve to be recovered, can obviously reflect longitudinal spatial variation of lithofacies and lithological characters, has the characteristics of fast computation speed, good stability, high computation accuracy and strong anti-noise capability, and can be directly used for inversion of seismic data.

Description

Technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a logging curve recovery method for tight gas-bearing sandstone reservoir prediction Background technique [0002] Seismic exploration technology is one of the most widely used geophysical methods in oil and gas exploration. It uses changes in the speed, amplitude, frequency, phase, waveform and other parameters of seismic waves propagating in different media to analyze and predict the distribution range and storage of oil and gas reservoirs. Layer physical characteristics. With the gradual deepening of exploration and development, seismic exploration has gradually developed from structural exploration that recognizes the shape of underground structures to lithological exploration that directly uses seismic information to judge lithology, analyze lithofacies, and quantitatively calculate rock physical parameters. Reservoirs in these complex sedimentary envir...

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Application Information

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IPC IPC(8): G01V1/48G01V1/50
Inventor 白俊雨岳承琪
Owner CHINA PETROLEUM & CHEM CORP
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