High-resolution crosswell imaging of a west Texas carbonate reservoir. Part 1: Project summary and interpretation
- Stanford Univ., CA (United States)
- Chevron Petroleum Technology Co., La Habra, CA (United States)
A carbon dioxide flood pilot is being conducted in a section of Chevron`s McElroy field in Crane County, west Texas. Prior to CO{sub 2} injection, two high-frequency crosswell seismic profiles were recorded to investigate the use of seismic profiling for high-resolution reservoir delineation and CO{sub 2} monitoring. These preinjection profiles provide the baseline for time-lapse monitoring. Profile {number_sign}1 was recorded between an injector well and an offset observation well at a nominal well-to-well distance of 184 ft (56 m). Profile {number_sign}2 was recorded between a producing well and the observation well at a nominal distance of 600 ft (183 m). The combination of traveltime tomography and stacked CDP reflection amplitudes demonstrates how high-frequency crosswell seismic data can be used to image both large and small scale heterogeneity between wells: transmission traveltime tomography is used to image the large scale velocity variations; CDP reflection imaging is then used to image smaller scale impedance heterogeneities. The results of this integrated study demonstrate (1) the use of crosswell seismic profiling to produce a high-resolution reservoir delineation and (2) the possibility for successful monitoring of CO{sub 2} in carbonate reservoirs. The crosswell data were acquired with a piezoelectric source and a multilevel hydrophone array. Both profiles, nearly 80,000 seismic traces, were recorded in approximately 80 hours using a new acquisition technique of shooting on-the-fly. This paper presents the overall project summary and interpretation of the results from the near-offset profile.
- OSTI ID:
- 87537
- Journal Information:
- Geophysics, Journal Name: Geophysics Journal Issue: 3 Vol. 60; ISSN GPYSA7; ISSN 0016-8033
- Country of Publication:
- United States
- Language:
- English
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