Common-depth-point method for determining and displaying the shear-velocity reflectivities of a geologic formation

Patent · Tue Aug 06 00:00:00 EDT 1985

OSTI ID:6416138

Wiggins, R; Kenny, G S; McClure,

A novel method for determining and displaying the shear-velocity reflectivities of geologic formations is disclosed wherein a compression-wave common-depth-point seismic-data-gathering technique is utilized to produce both normal incidence compressional-velocity reflectivity sections and shear-velocity reflectivity sections for reflection points in given geologic formations. The subject method includes the gathering of common-depth-point information for a plurality of incidence angles, (theta) and estimating the linear coefficients (R /SUB pp/ . /SUB o/ and R /SUB pp/ ./sub 1/)of a linear function fitted to the amplitudes vs. sin/sup 2/ (theta) measured for each point of reflection. The common-depth-point gather is conducted at angles of offset of less than 20-30 degrees such that assumptions concerning various elastic parameters: density, compressional wave velocity and shear-wave-velocity can be made which allow the application of linear fitting techniques to the gathered data. The sum of these coefficients corresponds to the shear-velocity reflectivity of the reflection point and may be presented with similar data for other points in appropriate shear-reflectivity sections.

• Assignee: Mobil Oil Corp.
• Patent Number(s): US 4534019
• OSTI ID: 6416138
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
DATA PROCESSING
EXPLORATION
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
OPTICAL PROPERTIES
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
PROCESSING
REFLECTIVITY
RESOURCES
SEISMIC P WAVES
SEISMIC SURVEYS
SEISMIC WAVES
SHEAR
SURFACE PROPERTIES
SURVEYS
VELOCITY