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Fracture fluid identifying method based on longitudinal wave azimuthal AVO (Amplitude Variation with Offset)

A fracture and longitudinal wave technology, applied in the field of oil exploration

Inactive Publication Date: 2013-01-02
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
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Problems solved by technology

However, there are few studies on the application of fracture fluid identification in actual data

Method used

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  • Fracture fluid identifying method based on longitudinal wave azimuthal AVO (Amplitude Variation with Offset)
  • Fracture fluid identifying method based on longitudinal wave azimuthal AVO (Amplitude Variation with Offset)
  • Fracture fluid identifying method based on longitudinal wave azimuthal AVO (Amplitude Variation with Offset)

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Embodiment Construction

[0053] The specific implementation manner of the present invention will be described below in conjunction with the embodiments and accompanying drawings.

[0054] Figure 1 to Figure 4 The effectiveness of the fracture fluid identification method is demonstrated by numerical forward modeling. Based on the special geological conditions of a fractured reservoir in a block in Xinjiang in the embodiment of the present invention, the forward modeling simulation is carried out, and the model used is as follows figure 1 As shown, the model has two layers, the upper layer is the limestone matrix, and the lower layer is the fractured medium. The parameters of the background rock matrix and the medium parameters filled with gas, oil and water are shown in Table 1.

[0055] Table 1 Fracture filling parameters

[0056] Filling and its properties background medium gas Oil water P-wave velocity (m / s) 6000 350 1300 1647 Shear wave velocity (m / s) ...

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Abstract

The invention relates to a fracture fluid identifying method based on longitudinal wave azimuthal AVO (Amplitude Variation with Offset). Fractures are reservoir spaces of oil gas and migration pathways of fluids, so that the fracture detection is significant on searching oil gas reservoirs. The identification of the fractures is the present research hotspot and difficult point and the identification of types of the fluids in the fractured reservoirs is doubly difficult. According to the method, the identification method of the types of the fluids in the fractures is further researched on the basis of anisotropy fracture inversion. Indicated by the forward modeling of a numerical model, the isotropy gradient and the anisotropy gradient in the world-famous Ruger equation have a certain capability of identifying the types of fracture fluids and particularly distinguishing dry fractures (filled with gas) and wet fractures (filled with oil and water). The method disclosed by the invention has the advantages of capability of being applied to actual data and identifying the types of the fluids in the fractures in areas relatively high in anisotropy degree.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and relates to a method for identifying fracture fluid types in fracture reservoir comprehensive evaluation. Background technique [0002] Fractured reservoirs account for about one-third of the world's oil and gas reserves. Fractures develop in carbonate rocks, mudstones, sandstones, volcanic rocks and metamorphic rocks. On the one hand, fractures are oil and gas storage spaces, and on the other hand, as fluid migration channels, they can connect the scattered pore storage spaces in the reservoir. Therefore, predicting the development and distribution of fractures is of great significance for finding oil and gas reservoirs. The presence of fractures makes the reservoir anisotropic. The so-called anisotropy means that the physical properties (amplitude, velocity, frequency, etc.) of seismic waves change with the change of observation azimuth. For vertically arranged parallel fractures, it ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 孙赞东肖曦李艳东
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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