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Method for detecting reservoir fissure development direction by utilizing seismic data

A technology for seismic data and fracture development, which is used in seismology for logging records, and can solve problems such as unclear physical meaning.

Inactive Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

But there are 4 forms of its solution, their physical meaning is not clear, and how to choose the angle in practical application is a problem

Method used

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  • Method for detecting reservoir fissure development direction by utilizing seismic data
  • Method for detecting reservoir fissure development direction by utilizing seismic data
  • Method for detecting reservoir fissure development direction by utilizing seismic data

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Embodiment Construction

[0050] figure 1 It is a schematic diagram of the angle θ formed between the acquisition system coordinate system and the natural system coordinate system.

[0051] In the multi-component seismic data acquisition and observation system, the shot-detection direction composed of shot points and receiver points is called the survey line direction, the horizontal geophone embedded along the survey line direction is called the X component, and the vertical geophone embedded in the survey line direction is called the X component. The horizontal detector is called the Y component. There is an unknown angle θ between the acquisition system coordinate (XOY) determined by the X and Y components and the "natural coordinate" (fracture system defined by S1 and S2 waves), see figure 1 shown.

[0052] figure 2 In embodiment 1, the model record of 37 fast and slow shear waves, fast and slow wave amplitude ratio=5, time delay=3 sample points, signal-to-noise ratio=5 (different signal-to-n...

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Abstract

The invention belongs to a method for detecting reservoir fissure development direction in the field of petroleum seismic exploration and oil gas field development, particularly relating to an analytical expression of an included angle between an acquisition system coordinate system and a natural system coordinate system by utilizing multiple wave seismic data, an orthogonality principle formula and an Alford rotation formula; an angle analytical formula inverts the main direction of the fissure and analyzes the fissure development density so as to detect the reservoir fissure development. The angel has a specific physical significance, back calculation is simple and convenient, and an algorithm is not affected by fast and slow shear wave delay time. Even if the polarization of the fast and slow shear wave does not strictly satisfy the relationship of cross polarization, the angle of the inversion angle analytical expression is still within the acceptable error range. The precision of the inversion angle more approaches the real result along with the improvement of the signal to noise ratio of the multi-component data.

Description

technical field [0001] The invention belongs to the method for detecting the development direction of reservoir fractures in the field of petroleum seismic exploration and oil and gas field development, and particularly relates to a method for deriving the coordinate system of the acquisition system and the natural The mathematical analysis expression of the included angle between the system coordinate systems, and then detect the fracture direction and density parameters of the reservoir, have important guiding significance for oil and gas development. Background technique [0002] According to the propagation direction and vibration direction of the wave, the seismic wave is divided into longitudinal wave P and transverse wave S, and the conversion of longitudinal wave into transverse wave is called converted wave PS. In multi-component seismic exploration, the compressional wave and converted wave can be collected and received by excitation of the compressional wave sourc...

Claims

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Application Information

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IPC IPC(8): G01V1/40
Inventor 黄中玉王于静
Owner CHINA PETROLEUM & CHEM CORP
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