Converted wave AVO calculating method of four-dimensional multi-component seismic monitoring in CO2 geological sequestration

A four-dimensional multi-component, geological storage technology, applied in the field of converted wave AVO calculation, can solve the problem of not analyzing the influence of pressure changes on reservoir elastic parameters

Active Publication Date: 2016-05-25
NORTHWEST UNIV
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Problems solved by technology

Even in CO 2 Geological storage and CO 2 -In EOR four-dimensional multi-component moni

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  • Converted wave AVO calculating method of four-dimensional multi-component seismic monitoring in CO2 geological sequestration
  • Converted wave AVO calculating method of four-dimensional multi-component seismic monitoring in CO2 geological sequestration
  • Converted wave AVO calculating method of four-dimensional multi-component seismic monitoring in CO2 geological sequestration

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Embodiment Construction

[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0048] CO 2 The calculation method of converted wave AVO in the four-dimensional seismic monitoring of geological storage includes the following steps:

[0049]First, sort out the well logging curves in the work area to obtain the CO 2 The log curves of P-wave velocity, shear-wave velocity, density, porosity and other parameters before injection are combined with Archie’s formula to obtain water saturation curve, as shown in figure 1 It is the logging curve of the reservoir position after sorting out Well 1020423 in Weyburn Oilfield, Canada. The petrophysical parameters of the core dry rock were obtained by sampling the core of the reservoir and performing petrophysical experiments on the core. Table 1 and Table 2 respectively show the petrophysical parameters of the Weyburn oilfield reservoir core, figure 2 It is the change of the physical parameters of ...

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Abstract

A converted wave AVO calculating method of four-dimensional multi-component seismic monitoring in CO2 geological sequestration is disclosed. The method is characterized by simulating PS1converted wave and PS2 converted wave AVO corresponding to different incident angles and different orientations in different phases of CO2 injection and geological sequestration under the condition that storage layer hole pressure, CO2 saturation and a fracture density are changed; aiming at a storage layer, for an isotropic medium and an anisotropic medium, in different phases of CO2 injection, under the condition that the storage layer hole pressure and mixed fluid saturation are changed, carrying out storage-layer elasticity parameter changes and AVO changes; aiming at an HTI media model, simulating crack opening caused by increase of injection well pressure and crack closing caused by decrease of production well pressure; aiming at porosity and crack density changes, analyzing four-dimensional converted wave AVO and orientation AVO changes in the anisotropic medium before and after the CO2 injection, wherein the changes are caused by fracture density changes. Four-dimensional converted wave earthquake data is calibrated and interpreted, CO2 oil displacement efficiency, an underground sequestration state of CO2 and a distribution scope are determined and safety of the CO2 geological sequestration is evaluated.

Description

technical field [0001] The invention patent involves CO 2 The field of four-dimensional multi-component seismic monitoring technology in oil flooding and geological storage, specifically related to CO 2 Converted wave AVO calculation method for 4D multicomponent seismic monitoring in geological storage for modeling CO 2 The converted wave AVO seismic response and the 4D converted wave differential response in 4D multi-component seismic monitoring at different stages of injection into the ground. Background technique [0002] Since Landro et al. (2003) of the Norwegian University of Science and Technology successfully carried out 4D seismic PP and PS wave AVO combined inversion research on sandstone reservoir pressure and fluid saturation, 4D multi-component converted wave seismic has gained more and more attention in international oil and gas exploration. more and more applications. This is mainly because it is difficult to distinguish the amplitude difference between res...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 杨扬马劲风
Owner NORTHWEST UNIV
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