Petrophysical Mechanism and Seismic Prediction Method of Inter-salt Shale Oil Reservoir

A technology of rock physics and earthquake prediction, applied in the field of oil exploration

Active Publication Date: 2021-05-18
JILIN UNIV
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Problems solved by technology

[0003] However, there are few published studies on seismic rock physics prediction of inter-salt shale oil reservoirs, and the research mainly focuses on qualitative or semi-quantitative interpretation based on seismic elastic inversion

Method used

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  • Petrophysical Mechanism and Seismic Prediction Method of Inter-salt Shale Oil Reservoir
  • Petrophysical Mechanism and Seismic Prediction Method of Inter-salt Shale Oil Reservoir
  • Petrophysical Mechanism and Seismic Prediction Method of Inter-salt Shale Oil Reservoir

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Experimental program
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Embodiment 1

[0105] Fig. 1 is the petrophysical inversion results of the fracture and clay mixture parameters of Well A in the selected work area. Figure 1a with Figure 1b The actual P- and S-wave velocity logging data (black curves) in the medium well fit well with the fitting values ​​obtained during the inversion process (red curves), indicating that the petrophysical model and inversion method are applicable to the shale in the study area.

[0106] Figure 1c is the aspect ratio αH of the horizontal fracture in shale, and its value approaching 0 indicates that the fracture is narrower and longer, and approaching 1 indicates that the fracture is closer to a spherical shape. This parameter can be used to characterize the geometry of the horizontal fracture. Such as Figure 1c As shown, the aspect ratio values ​​of horizontal fractures in each shale interval show a large range of variation. Studies have shown that this parameter can reflect the connectivity of the reservoir fracture ...

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Abstract

The present invention relates to a rock physical mechanism and seismic prediction method of inter-salt shale oil reservoirs, which clarifies the rock physical mechanism of inter-salt shale oil layers, establishes anisotropic rock physical models, and develops shale oil reservoirs on this basis The inversion and seismic prediction methods of rock physics in wells are based on physical parameters such as laminar structure and horizontal fractures. The petrophysical model of the present invention considers the proportion of illite and montmorillonite in the clay mixture and the properties of soft matter between clay particles, explains the high abnormal value of the shale P-to-s wave velocity ratio Vp / Vs, and applies it to inter-salt shale oil reservoirs Actual data, predicted the physical properties of the microstructure related to clay and fractures in shale, as well as the elastic anisotropy of clay mixture, solid matrix, and shale as a whole; used for quantitative interpretation of seismic elastic inversion results, predicted The spatial distribution of physical properties and anisotropy parameters such as reservoir bedding and fractures; the spatial distribution of key physical parameters of shale oil reservoirs can be used to identify and predict favorable reservoirs.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, and in particular relates to a petrophysical mechanism and earthquake prediction method of an inter-salt shale oil reservoir. Background technique [0002] The petrophysical mechanism of shale is different from that of conventional sandstone or carbonate rock. The microscopic layered structure between minerals and organic matter in shale, lamellar and laminar structure, horizontal fractures and other physical characteristics make shale present inherent VTI (Transverselyisotropy with a vertical symmetry axis) anisotropy. In terms of shale anisotropy petrophysics, earlier studies include laboratory core measurements of anisotropy in organic-rich shales in the article "Velocity anisotropyin shales: A petrophysical study" by Vernik and Liu in Geophysics in 1997 , the petrophysical modeling carried out on this basis considers the microscopic layered interaction structure of clay and org...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/00
CPCG01V1/008G01V1/306G01V2210/624G01V2210/6242G01V2210/6244G01V2210/626
Inventor 郭智奇仉涛
Owner JILIN UNIV
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