skip to main content

Title: Exploiting P-S converted waves. Part 2: Application to a fractured reservoir

A P-S data set, with nearby well data for analysis constraint, was collected in southwest Venezuela to map the strike, density, and extent of fractures in the hydrocarbon bearing formation of a reservoir. Three 10 km multicomponent lines were centered over the reservoir along three different azimuths. The survey design was geared to maximize the data quality with respect to resolution, signal-to-noise ratio, sufficient spatial and temporal sampling, correct near and far offsets, maximum dip, and elimination of any variation in amplitude or traveltime that can be confused with lithological effects. Well information indicates that the hydrocarbon bearing formation is a fractured limestone with a depth of approximately 3,000 m, and gently dipping in a NE-SW direction. Based on previous seismic P-wave data, subtle lithological structures and small normal faults dominate the reflection horizons of the target zone. These structures appear to dominate the production history of the existing wells in the field, which implies the necessity of high resolution data for better definition of the seismic events. Results from the collected data suggest presence of azimuthal anisotropy that effects P-S converted-wave amplitude and traveltime. Observations appear to be consistent with the geological setup in the area of study. However,more » accurate quantification of anisotropic parameters must be done after appropriate processing of the data and careful confirmation of results with borehole measurements.« less
Authors:
; ;  [1] ; ;  [2]
  1. Intevep S.A., Caracas (Venezuela)
  2. Corpoven S.A., Caracas (Venezuela)
Publication Date:
OSTI Identifier:
80199
Report Number(s):
CONF-941015--
Journal ID: ISSN 1052-3812; TRN: IM9532%%326
Resource Type:
Conference
Resource Relation:
Conference: 64. annual meeting of the Society of Exploration Geophysicists and international exposition, Los Angeles, CA (United States), 23-27 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of SEG international exposition and sixty-fourth annual meeting -- 1994 Technical program: Expanded abstracts with authors` biographies; PB: 1736 p.
Publisher:
Society of Exploration Geophysicists, Tulsa, OK (United States)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; 58 GEOSCIENCES; SEISMIC SURVEYS; DATA PROCESSING; PETROLEUM DEPOSITS; SEISMIC WAVES; ANISOTROPY; VENEZUELA; RESPONSE FUNCTIONS; MATHEMATICAL MODELS