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Density prediction method and device under lithofacies control

A prediction method and facies control technology, applied in the field of geophysical exploration and seismic interpretation, can solve problems such as low degree of detection and unsatisfactory resolution, and achieve the effect of improving prediction precision and accuracy

Inactive Publication Date: 2017-10-31
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0002] Since the 1990s, my country has increased its efforts in natural gas exploration, and the proven reserves have grown rapidly and steadily every year, but the proven level is still very low, only 6.7%
However, in this method, the density difference is used to obtain the effective density body, and the hydrocarbon-bearing situation is predicted by evaluating the density difference in the density body data, and the amplitude and AVO response of the hydrocarbon are obtained, and compared with the known reservoir, the resolution is still not enough. satisfactory

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  • Density prediction method and device under lithofacies control
  • Density prediction method and device under lithofacies control
  • Density prediction method and device under lithofacies control

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Embodiment 1

[0022] figure 1 A flow chart of a method for density prediction under lithofacies control according to an embodiment of the present invention is shown. In this embodiment, the method includes:

[0023] Step 101, obtaining multiple elastic impedance inversion volumes corresponding to multiple incident angle superposition data;

[0024] Step 102, obtaining a lithofacies body based on part or all of the elastic impedance inversion volumes in the plurality of elastic impedance inversion volumes, and obtaining a wave impedance volume based on the part or all of the elastic impedance inversion volumes;

[0025] Step 103, under the control of the lithofacies body, the dry layer and the water layer in the lithofacies body are excluded, and the following formula is determined based on the wave impedance bodies and logging data corresponding to the remaining favorable gas layer areas in the lithofacies body Parameters a and b in:

[0026] ρ=log(a*AI)+b, Formula 1

[0027] Among them...

Embodiment 2

[0036] According to another embodiment of the present invention, a density prediction device under lithofacies control is also disclosed. In this embodiment, the device includes an elastic impedance inversion volume acquisition unit, a lithofacies volume acquisition unit, a wave impedance volume acquisition unit, a parameter determination unit and a density prediction unit. The elastic impedance inversion volume acquisition unit is used to obtain multiple elastic impedance inversion volumes corresponding to the superposition data of multiple incident angles. The lithofacies body acquisition unit is configured to obtain lithofacies bodies based on part or all of the elastic impedance inversion bodies in the plurality of elastic impedance inversion bodies. The acoustic impedance volume obtaining unit is configured to obtain the acoustic impedance volume based on the part or all of the elastic impedance inversion volume. The parameter determination unit is used to exclude the dr...

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Abstract

The invention discloses a density prediction method and device under lithofacies control. Lithofacies control is added into inversion and an inversion parameter is corrected by eliminating influences of a dry layer and a water layer; and density prediction is carried out at a favorable gas reservoir layer. Therefore, the prediction precision and accuracy are improved.

Description

technical field [0001] The invention relates to the field of seismic interpretation of geophysical exploration, and more specifically, relates to a density prediction method under lithofacies control and a density prediction device under lithofacies control. Background technique [0002] Since the 1990s, my country has increased its efforts in natural gas exploration, and the proven reserves have grown rapidly and steadily every year, but the proven level is still very low, only 6.7%. With the increase of exploration and development, reservoir evaluation and gas-bearing prediction become the core part of the work. How to obtain reservoir physical parameters such as saturation and porosity from seismic data is the key to reservoir pore fluid prediction. With the increasing difficulty of exploration, it is difficult to achieve the purpose of identifying fluids only by using a single or a small amount of information. In recent years, based on seismic data, people have conduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306
Inventor 王瑞温立峰王震宇韩磊许云书
Owner CHINA PETROLEUM & CHEM CORP
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