Vertical Seismic Profiling

(服务)

Online Support Service: No

Interpretation of Data: No

描述:

Vertical seismic profiling allows you to study the geological structure and physical properties of the borehole space using various types of waves - longitudinal, transverse, exchange, based on the analysis of the characteristics of these waves, their propagation velocity, attenuation, spatial polarization, the nature of rock anisotropy.

概观:

Typical conditions of use:

It is used in open and cased wells filled with any flushing fluid.

VSP Borehole DIGITAL EQUIPMENT (АМЦ-ВСП-3-48)

ADVANTAGES:

APPLICATION AREA:

the influence of surface waves on the seismogram is almost completely eliminated, since the geophones are usually located below the region of their registration;
the first arrivals on the seismogram give the first approximation of the true kinematic model of the medium;
the signal from the excitation is observed in the medium, and not on the surface, which allows us to evaluate and take into account its shape;
the ability to accurately correlate GIS data with ground-based seismic data.

study of the speed characteristics of the section;
stratigraphic reference of the wave field of reflected waves to reference horizons and reservoirs in an open geological section;
identification of discontinuous disturbances (including low-amplitude ones) and lateral changes in the lithologic-facies properties of formations;
clarification of the structural characteristics of the target intervals of the section in the near-wellbore space.
prediction of the geological structure below the bottom of the well;
prediction of zones of abnormally high reservoir pressures.

TECHNICAL FEATURES:

Device
AMC-VSP-3-48

provides work by all methods of downhole seismic exploration and VSP modifications (NVSP, etc.);
frequency range of measuring channels 12.5 - 250 Hz;
the sampling period is 0.5 ms; 1 ms 2 ms; 4 ms;
demultiplexed data is recorded in the formats SCS-3, SEG - Y;
the equipment includes instruments: three-component borehole, ground control and registration unit, block of ground monitoring geophones;
the ability to work with any pulsed excitation sources.

SPECIFICATIONS:

Device	Length (m)	Diameter (mm)	Max temperature (° С)	Max pressure (MPa)	Dynamic channel range (dB)	Weight (kg)
AMC-VSP-3-48 ¹	1.25	48 (51)	120	one hundred	150	10.5

RESEARCH TECHNOLOGY

When conducting VSP, signal reception points are located in the well and are shifted vertically, occupying various positions in depth. The seismic signal is excited from the surface of the Earth and can be carried out by various types of sources.

INTERPRETATION OF VSP RESULTS

VSP recorded wave field

Comparison of VSP and OGT data

Prediction of a cut below the bottom

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公司简介

OJSC Kogalymneftegeofizika

地点: Russia / Kogalym

主要产品/服务: Geophysical and geological and technological research, data interpretation