Method for determining the presence of hydrocarbons in subsurface geological formations by comparative assessment of compressional and shear wave reflection data
This paper describes a method for determining the presence of hydrocarbons in subsurface geological formations by comparative assessment of acquired compressional wave reflection information and pseudoshear wave reflection information estimated from acquired compressional wave reflection information. It comprises the steps of: generating descending acoustic compressional waves from a plurality of acoustic wave sources and receiving and recording at a plurality of receivers ascending compressional wave reflection information produced at a subsurface interface; gathering the recorded compressional wave reflection information into sets of different source-receiver offsets having a common reflection boundary; correcting gathered compressional wave reflection information for normal moveout; measuring amplitudes of gathered compressional wave reflection information at given points in time for different source-receiver offset value; determining directly from the measured amplitude offset values pseudoshear wave reflection information, selecting compressional wave reflection information; selecting produced pseudoshear wave reflection information; combining selected compressional wave reflection information and selected pseudoshear wave reflection information according to the relation R/sub s/-R/sub s/, where R/sub p/ is the selected compressional wave reflection information and Rs is the selected pseudoshear wave reflection information; and comparing the combined wave reflection information to the selected compressional wave reflection information.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4858200
- Application Number:
- PPN: US 7099451A
- OSTI ID:
- 5323634
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
DATA PROCESSING
EQUIPMENT
EXPLORATION
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PROCESSING
RESOURCES
SONIC LOGGING
SOUND WAVES
WAVE PROPAGATION
WELL LOGGING
WELL LOGGING EQUIPMENT