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A Fluid Identification Method Based on Equivalent Fluid Acoustic Impedance

A fluid acoustic wave and fluid identification technology, applied in seismic signal processing and other directions, can solve the problems of strict seismic data requirements, low accuracy of reservoir physical parameters, and large computational workload.

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, not only the calculation workload is heavy, the method is complicated, the accuracy of the inversion reservoir physical parameters is low, but also the requirements for the seismic data used are very strict.

Method used

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  • A Fluid Identification Method Based on Equivalent Fluid Acoustic Impedance
  • A Fluid Identification Method Based on Equivalent Fluid Acoustic Impedance
  • A Fluid Identification Method Based on Equivalent Fluid Acoustic Impedance

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Experimental program
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Effect test

Embodiment 1

[0068] Forward simulation case, the steps are as follows:

[0069] 1. Establish geological model through modeling software. Geological models such as figure 1 As shown, the model is 1000m wide, 500m high, and 4 stratigraphic boundaries divide the model into 5 layers. Assume that the 1st, 3rd, and 5th layers are mudstone formations, and the propagation speed of sound waves in this formation is 3000m / s, which is represented by gray. Assume that the 2nd and 4th layers are sandstone formations, and the porosity value is preferably 10% ~30%, in the present embodiment, formation porosity is 20%, and various fluids are in saturated state in sandstone formation, and the 4th layer is the formation that is full of water, and the density of water is assumed as 1g / cm 3 , the speed of sound waves in this formation is 3900m / s, the top of the second layer is full of oil, and the density of oil is assumed to be 0.8g / cm 3 , the speed of sound waves in this formation is 3800m / s, and the lowe...

Embodiment 2

[0096] Actual inversion case

[0097] The steps are:

[0098] 1) Firstly, denoising processing, surface consistency correction, spherical diffusion compensation, wavelet processing, DMO processing, and migration processing are performed on the collected seismic data, so that the obtained seismic data can be more realistically retrieved underground information, and the data amplitude can be preserved. real. Target interval T for seismic data 4 0 explanation, such as Figure 7 shown. On this basis, the oil density, water density, seismic wave propagation velocity, and porosity at different positions in the reservoir are obtained by using logging interpretation methods or petrophysical testing methods to form a data set. Figure 8 In order to perform uphole porosity interpretation based on logging data, porosity data for inversion can be obtained based on seismic interpretation and interpreted porosity data, such as Figure 9 As shown, the porosity is the measured porosity ...

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Abstract

The invention discloses a fluid identification based on equivalent fluid acoustic wave impedance in the technical field of exploration. According to the method, firstly, a data set of a reservoir is obtained through a logging method or a rock physical testing method, then rock density of saturated fluid is built, then acoustic wave impedance of saturated fluid rock is obtained through inversion, the acoustic wave impedance is decomposed into the sum of framework equivalent acoustic wave impedance and fluid equivalent impedance, and the fluid equivalent impedance is calculated according to the acoustic wave impedance obtained through inversion and framework acoustic wave impedance; graphical display of the data set of the fluid equivalent impedance is achieved by means of earthquake display software of the petroleum exploration major, and fluid recognition is carried out according to a displayed graph. By means of the method, porosity of the rock and properties of fluid contained in the rock can be reflected, the requirement for earthquake documents is simple, calculation amount is small, calculation is relatively simple, and fluid recognition can be better carried out.

Description

technical field [0001] The invention relates to a reflection seismic exploration technology, in particular to a method for fluid identification using acoustic wave impedance. Background technique [0002] Reflection seismic exploration is the use of seismic reflection wave method to explore the underground geological structure or lithological characteristics. The specific method is to measure the arrival time and waveform change of the seismic wave event reflected from the interface with acoustic wave impedance. According to the arrival time, amplitude and waveform of the reflection event, the change of underground formation can be ascertained, so as to find and evaluate oil and gas traps. [0003] Acoustic impedance is the product of seismic wave velocity and density of formation rock. Expressed as: [0004] AI=ρν (1) [0005] where AI is the acoustic impedance, ρ is the density of saturated fluid rock, and ν is the velocity of seismic wave propagating in the rock. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 梁兵鲍祥生丁建荣
Owner CHINA PETROLEUM & CHEM CORP