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Method for predicting CO2 distribution in four-dimensional seismic data in CO2 geological sequestration

A four-dimensional seismic and geological storage technology, applied in seismic signal processing and other directions, can solve the problem of inability to correctly identify CO2 distribution, etc., and achieve the effect of accurate elastic characteristics, accurate calculation and accurate establishment

Active Publication Date: 2015-06-03
NORTHWEST UNIV
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Problems solved by technology

[0018] In this case, the traditional AVO method based on the two-layer media model cannot correctly identify the storage and subsurface CO 2 distributed

Method used

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  • Method for predicting CO2 distribution in four-dimensional seismic data in CO2 geological sequestration
  • Method for predicting CO2 distribution in four-dimensional seismic data in CO2 geological sequestration
  • Method for predicting CO2 distribution in four-dimensional seismic data in CO2 geological sequestration

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Experimental program
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Embodiment

[0056] a CO 2 4D Seismic Data CO in Geological Storage 2 A method for distribution prediction, comprising the following steps:

[0057] First, we use Xu's formula (2006) to calculate the CO 2 Elastic parameters, the results are more realistic, and are quite different from the conventional method and software using the Batzle-Wang formula (1992); in this way, CO can be obtained 2 Velocity, density, elastic modulus and other elastic parameters of fluid mixed with brine, oil, and gas. figure 1 CO calculated using Xu's formula (2006) 2 Elastic parameters (dotted line) are compared with the results calculated by Batzle-Wang formula (1992) (solid line); Xu’s method is more in line with the actual test results (2006); the gray line in the figure represents the CO injection into the reservoir 2 After the temperature dropped to 56°C, the black line represents the injection of CO into the reservoir 2 The previous formation temperature was 63°C;

[0058] figure 2 is the elastic p...

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Abstract

The invention relates to a method for predicting CO2 distribution in four-dimensional seismic data in CO2 geological sequestration. The method comprises the following steps: (1) simulating fluid elasticity parameter calculation under change conditions such as different underground stratum temperatures, pressures and brine mineralization degrees; (2) establishing a relation or a formula among elasticity modulus, shear modulus and pressure of dry rock based on a rock physics test of a rock core; (3) improving a fluid replacement method based on a Gassman equation; (4) carrying out shale correction on stratums; (5) utilizing different fluid replacement methods according to different CO2 filling manners based on fluid replacement calculation of a well model filled with CO2; (6) carrying out environment correction and high-precision depth-time conversion on logging information, simultaneously, calculating ray parameter gathers or angle gathers, and manually synthesizing a seismic record; (7) establishing a gradient-intercept crossplot of CO2 saturability and pressure change, and picking up CO2 fluid identifying factors changed along with the pressure change and the saturability change; and (8) applying the CO2 fluid identifying factors to actual seismic data, so as to identify and predict the underground CO2 distribution. According to the method, the distribution of CO2 sealed underground can be identified and predicted.

Description

technical field [0001] The invention belongs to oil field flooding technology, CO 2 The technical field of geological storage, specifically related to a CO 2 4D Seismic Data CO in Geological Storage 2 Methods for distribution forecasting. Background technique [0002] A study on the use of four-dimensional (also known as time-lapse, time-lapse) seismic exploration data 2 CO during geological storage 2 Methods for distribution forecasting. How to use 4D Seismic or CO 2 Analysis of seismic monitoring acquired after injection to predict CO 2 CO during geological storage 2 distribution in the subsurface, is the detection of CO 2 The key to geological storage safety and leakage risk. Inject CO 2 Post-subsurface distribution prediction is to determine the subsurface storage of CO 2 Whether it can break through the caprock, cracks and judge the key to leakage from the high-pressure area to the outside of the storage area. while underground CO 2 distribution is also det...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
Inventor 马劲风李琳
Owner NORTHWEST UNIV
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