Method for determining formation lithologic character and pore fluid

A technology of pore fluid and formation lithology, applied in the field of geophysical exploration, can solve the problems of unable to obtain shear wave impedance, unable to meet the requirements of formation identification, etc.

Active Publication Date: 2009-01-28
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, this method only considers the transmission and refraction of the seismic P-wave in the formation, and only uses the P-wave, so the wave...

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  • Method for determining formation lithologic character and pore fluid
  • Method for determining formation lithologic character and pore fluid
  • Method for determining formation lithologic character and pore fluid

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Embodiment Construction

[0036] In the field, explosives and mechanical vibrators are used to artificially stimulate seismic waves on the ground, and a three-component seismic wave receiver is placed in the well to receive the seismic wave field signal, and then transmitted to the ground recording instrument by a cable to record the three-component VSP seismic wave field;

[0037] For the acquired three-component VSP raw seismic data, see figure 1 , perform wavefield separation, corridor stacking and frequency band widening to obtain different types of zero-well-source seismic wavefields, see figure 2 , image 3 , Figure 4 , Figure 5 . Including the downgoing longitudinal wave field, the upgoing reflected longitudinal wave field, the upgoing converted shear wave field, and the downgoing converted shear wave field;

[0038] Various types of seismic wave fields (downgoing P-wave, figure 2 ;Upconverted shear wave, image 3 ;downward converted shear wave, Figure 4 ; Upward reflected longitudi...

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Abstract

The invention relates to a method which uses geophysical exploration to determine stratum lithology and pore-fluid. The method of the invention adopts recorded three-component VSP seismic wave field, obtains zero offset seismic wave field, calculates the transmission longitudinal wave P of the seismic wave field of sampling points of different depths, then calculates the reflecting coefficients and wave resistances of the longitudinal wave and the transverse wave; according to the obtain stratum wave resistance changing curve, compared with the known logging data, the lithology and the pore-fluid property of the stratum can be determined. The method of the invention can provide directly the wave resistance changing curve of deep domain, avoids the problems of multiplicity of the speed-depth, limited wideband and low resolution, has high resolution, sufficiently uses the advantages of three-component VSP, can provide resistance longitudinal wave and transverse wave and azimuth and inclined angle of the stratum simultaneously under a situation without transverse wave seismic source excitation, and provides beneficial bases for determining the change of the stratum lithology and the pore-fluid property.

Description

technical field [0001] The present invention relates to geophysical prospecting technology, specifically a method of inversion of longitudinal wave and converted shear wave information collected by three-component vertical seismic profile (VSP) to obtain the compressional wave and shear wave reflection coefficients of the strata beside the well, and then obtain the longitudinal and shear wave reflection coefficients of the wellside stratum through inversion. Shear wave impedance to determine formation lithology and pore fluid method. Background technique [0002] Vertical seismic profiling (VSP) is a very young seismic exploration technique. The general processing process of conventional vertical seismic profile (VSP) includes trace editing, wavefield separation (separation of upgoing and downgoing waves), corridor stacking, migration and inversion. These processing technologies are all dealing with longitudinal wave fields. In recent years, with the development of multi-w...

Claims

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Application Information

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IPC IPC(8): G01V1/40G01V1/28G01V1/30G01V1/36
Inventor 张红英侯爱源
Owner BC P INC CHINA NAT PETROLEUM CORP
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