Naturally fractured tight gas reservoir detection optimization. Quarterly technical progress report, October--December 1994
Through the last quarter of 1994, the P-wave 3D survey acquired for the owner/operator of the gas field was processed by Western Geophysical. The data quality from the survey is high with many of the key reflecting horizons easily identified on the field records and brute stacks. Preliminary inspection of the data by Lynn Inc., Coleman Research Corporation (CRC), and the owner/operator indicated that there are significant differences in the north-south and east-west stacks; that is, there are differences in the data when only the raypaths in a N-S direction are stacked versus when only the E-W raypaths are stacked. The differences are most apparent on inspection of the character, velocity, amplitude, and AVO (Amplitude Variation with Offset) results. During these initial inspections, a great concern was felt that the velocities used for stacking were not correct. In N-S slices, reflectors appeared to have the correct velocity for moveout. This would suggest that the E-W azimuths are dominating the velocity picks despite the fact that they are in the minority within each bin. An additional factor which likely is complicating this issue is the influence of dip on the velocities. These aspects of the data will be more fully investigated in the additional processing proposed by CRC under the DOE contract. The P-wave 3D data set was delivered to the owner/operator in the late December for loading on their in-house workstation. Interpretation will begin in early January.
- Research Organization:
- Coleman Energy and Environmental Systems, Golden, CO (United States). Blackhawk Geosciences Div.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC21-94MC31224
- OSTI ID:
- 53717
- Report Number(s):
- DOE/MC/31224--4040; ON: DE95010527
- Country of Publication:
- United States
- Language:
- English
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