Calculation method for electrical property anisotropy of transversely isotropic rock with cracks
A laterally isotropic and anisotropic technology, applied in the field of exploration geophysics, can solve problems such as electrical property simulation, and achieve the effect of accurate prediction results of effective electrical properties and electrical property anisotropy
Inactive Publication Date: 2019-04-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF5 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, anisotropic backgrounds caused by compaction and bedding (Anderson & Helbig, 1994; Clavaud, 2008) are relatively common, and there is no effective model for the anisotropic backgrounds containing oriented or randomly arranged geological bodies. (or crack) electrical properties to simulate
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0044] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0045] Such as figure 1 The case shown in a contains ellipsoidal fractures in the anisotropic plane of the transversely isotropic (TI) background medium. In the three-dimensional coordinate system, the x-y plane is the isotropic plane of the TI background medium. Cracks are expressed as
[0046]
[0047] where R x = R y ≥R z are the crack semi-axes parallel to the x-axis, y-axis and z-axis, respectively, where the crack aspect ratio (α) is defined as α=R z / R x .
[0048]Suppose the crack is an oblate spheroid with α≤1, and the y-axis of the oblate spheroid is parallel to the y-axis in the coordinate system.
[0049] A method for calculating the anisotropy of electrical properties of transversely isotropic rocks containing fractures, the specific implementation plan is as follows:
[005...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a calculation method for the electrical property anisotropy of transversely isotropic rock with cracks. According to the specific implementation scheme, the calculation methodcomprises the following steps that S1, the anisotropic conductivity sigma<x> and sigma<z> of transversely isotropic rock without cracks are experimentally measured, and the conductivity sigma of the cracks, the crack volume content phi and the number N of the cracks per unit volume are calculated; S2, the electric potentials outside and inside the cracks are calculated; S3, a component of the dipole moment in the j direction is calculated; S4, the conductivity of the transversely isotropic rock with the ellipsoidal cracks along the X-axis and the Z-axis is calculated, and S5, the electrical property anisotropy of the transversely isotropic rock with the cracks is calculated. The calculation method has the beneficial effects that the conductivity calculated by the calculation method is closer to the real rock result, the electrical property anisotropy prediction result is more accurate, the electric properties of the rock with the cracks can be more effectively predicted, and support is provided for seismic exploration, logging identification and crack reservoir evaluation.
Description
technical field [0001] The invention relates to the field of exploration geophysics, in particular to a method for calculating the electrical property anisotropy of transversely isotropic rocks containing ellipsoidal fractures in rock physics. Background technique [0002] As one of the most effective geophysical detection methods to understand the properties of underground rocks, electrical prospecting has been used in the study of deep earth structure (Toffelmier&Tyburczy, 2007; Kuvshinov, 2012), the actual oil and gas industry (Ellis&Singer, 2007; Constable, 2010) and It has been widely used in groundwater exploration (Goldman & Neubauer, 1994; Cassidy et al., 2014) with great success. In order to better understand and interpret the obtained electrical data, it is necessary to establish an effective model that can relate the electrical properties of subsurface rocks to their diagenetic composition and geometric information. [0003] Many related electrical models have be...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04G01V3/08
CPCG01N27/041G01V3/088
Inventor 韩同城李博徐登辉任舒波
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)