Inter-salt shale oil reservoir rock physical mechanism and earthquake prediction method

Abstract

The invention relates to an inter-salt shale oil reservoir rock physical mechanism and earthquake prediction method. The method defines the rock physical mechanism of an inter-salt shale oil reservoirsystem, establishes an anisotropic rock physical model, and on the basis, a borehole rock physical inversion and earthquake prediction method is developed for the laminated structure, horizontal seamand other physical parameters of the shale oil reservoir. The rock physical model considers the ratio of illite to montmorillonite in a clay mixture, and the problem of a high abnormal value of the shale longitudinal and transverse wave velocity ratio Vp / Vs is explained through the clay intergranular soft matter property, the method is applied to actual data of an inter-salt shale oil reservoir to predict the physical characteristics of a microscopic structure related to clay and cracks in shale and the elastic anisotropy of a clay mixture, a solid matrix and the whole shale; the method is used for quantitative interpretation of a seismic elastic inversion result and predicting the spatial distribution of reservoir stratification, cracks and other physical properties and anisotropy parameters. The spatial distribution of the key physical parameters of the shale oil reservoir can be used for identifying and predicting a favorable reservoir.

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...

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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

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