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Quantitatively forecasting method and device for oil-gas possibility of reservoirs

A technology of oil, gas and reservoir, applied in the field of petroleum exploration, can solve problems such as difficult prediction, oil and gas abundance prediction, fluid property detection and other problems

Active Publication Date: 2014-03-19
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

Reservoirs generally contain oil and gas, and the prediction of seismic oil and gas has a high coincidence rate, but the prediction of oil and gas abundance and the detection of fluid properties are difficult to predict worldwide

Method used

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  • Quantitatively forecasting method and device for oil-gas possibility of reservoirs
  • Quantitatively forecasting method and device for oil-gas possibility of reservoirs
  • Quantitatively forecasting method and device for oil-gas possibility of reservoirs

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Experimental program
Comparison scheme
Effect test

Embodiment

[0058] Step a): acquiring post-stack seismic data of oil and gas reservoirs;

[0059] Step b): estimating seismic wavelets according to the post-stack seismic data;

[0060] Step c): Based on the seismic wavelet, perform frequency division processing on the post-stack seismic data;

[0061] Step d): Combining the petrophysical model and the petrophysical parameters of known wells to carry out forward modeling of different oil and gas saturations to obtain the frequency-varying attributes of known wells;

[0062] According to the research results of rock physics theory, the seismic response of oil and gas reservoirs has obvious frequency-varying characteristics. Its theoretical basis is mainly based on the frequency-varying characteristics of velocity in rock physics, which leads to the frequency-varying characteristics of seismic reflection coefficient. The seismic wave reflection coefficient (NI) and phase angle (φ) can be expressed as:

[0063] | N...

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Abstract

The invention provides a quantitative forecasting method and device for oil-gas possibility of reservoirs. The method comprises the following steps: obtaining post-stack seismic data on the oil-gas reservoirs; estimating seismic wavelets based on the post-stack seismic data; performing frequency division processing on the post-stack seismic data based on the seismic wavelets; performing inversion on the post-stack seismic data subjected to frequency division processing, so as to obtain the seismic frequency variable attributes of the oil-gas reservoirs; performing forward modeling of the different oil-gas saturation degrees based on a rock physical model and rock physical parameters of a known well, so as to obtain the frequency variable attribute of the known well; based on the frequency variable attribute of the known well, building an intersection graph template between the frequency variable attributes of the different oil-gas saturation degrees and reflection coefficients; based on the graph template, obtaining the reservoir oil-gas saturation degrees corresponding to the seismic frequency variable attributes.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a method and device for quantitatively predicting oil and gas in reservoirs. Background technique [0002] With the increasing degree of exploration, lithologic reservoirs and subterranean reservoirs have become the main targets of exploration and development. Since the AVO technology was proposed in the 1980s, after years of research and exploration, the AVO inversion technology based on the assumption of elastic media has made great progress, developed a variety of attribute parameters, and established the relationship between the physical parameters of the underground medium and seismic attributes. The accuracy of reservoir prediction is greatly improved, and many successful examples of reservoir prediction have been obtained. However, for unconventional oil and gas reservoirs, using geophysical methods to predict and detect oil and gas in unconventional oil and gas reser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 陈双全王峣钧王磊李向阳
Owner BC P INC CHINA NAT PETROLEUM CORP
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