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Transient electromagnetical method for reservoir pore space anisotropy

An anisotropic, transient electromagnetic technology, applied in the field of transient electromagnetics, can solve the problem of no azimuthal anisotropy characteristics

Active Publication Date: 2009-03-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the apparent resistivity parameters of the two polarization modes can be calculated in surface electromagnetic exploration, there is no method to reflect the azimuthal anisotropy characteristics of formation electrical properties, and then determine the anisotropy of pores in oil and gas reservoirs

Method used

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  • Transient electromagnetical method for reservoir pore space anisotropy
  • Transient electromagnetical method for reservoir pore space anisotropy
  • Transient electromagnetical method for reservoir pore space anisotropy

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Embodiment Construction

[0037] The field data collection adopts the ground oblique source transient electromagnetic measurement scheme, such as figure 1 As shown, its characteristic is to use a certain angle away from the survey line (x direction) The ground wire of the excitation source. The generator 1 supplies power to the ground through the long ground wire 4 through the launch control device 2, and the launch device realizes precise synchronization of the whole system through GPS3. The layout of the source should be in the same geological structure unit as possible with the work area to be tested, and the work area can be covered within the effective range without the signal being too weak. Assume that the direction x of the survey line is consistent with the structural trend of the formation. In order to obtain the resistivity values ​​in two directions of the formation in one measurement, the source needs to be deviated from the x direction by a certain angle. The most convenient setting fo...

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Abstract

The invention pertains to the field of geophysical exploration and oilfield development technology, is a transient electromagnetic method for determining the reservoir pore anisotropy and comprises the following steps: an earthing conductor is taken as a driving source which deviates from a measuring line x direction to form a deflection angle Phi0, and two electric field components Ex and Ey orthometric each other are measured and recorded; the formation resistivity of x direction and y direction at different depth are obtained by refutation; an amplitude value of the horizontal component of electric field total field vector, an electric field anisotropy coefficient and an azimuth of an electric field principal axis vector are counted; the formation porosity value on the direction of electric property principal axis is obtained by the resistivity value on the direction of electric property principal axis; a vector arrow diagram is drawn, the length of the arrow shows the magnitude of the formation porosity or the resistivity on the direction of electric property principal axis, the pointedness of the vector arrow and the azimuth of a source dipole are both formation porosity isotropic; and the vector arrow deviated from the electric property principal axis is formation porosity anisotropy. The invention can determine pore distribution, lithology changing, local anomaly and local metamorphism in the formation porosity.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration and oilfield development, and relates to a transient electromagnetic method for obtaining electrical anisotropy parameters of reservoirs by using ground oblique source transient electromagnetic measurement, and then determining reservoir pore anisotropy. Background technique [0002] The electrical properties of the formation medium have anisotropic characteristics. From a microscopic point of view, it is the skeleton composition, particle size and distribution state of the rock formation, and the geometric structure of the pores that vary with different directions; from a relatively macroscopic point of view, it is the The distribution of cracks, changes in lithology, local structural anomalies, local metamorphism and other factors act together. [0003] At present, it has been observed that the electrical conductivity of shale is anisotropic, and its coefficient is between 1 and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/26G01V3/38
Inventor 胡文宝苏朱刘严良俊陈清礼唐新功谢兴兵胡家华郑仁淑王军民向葵
Owner BC P INC CHINA NAT PETROLEUM CORP
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