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- W47433928 abstract "Reflection seismic amplitude anomalies (bright spots) commonly are thought to be related to gas reservoirs but not oil reservoirs. However recent drilling in Green Canyon, offshore Louisiana, indicates there are bright spots related to oil reservoirs that contain no free gas. The oil does have a high gas-to-oil ratio (GOR). The physical basis for oil-related bright spots can be quantified using pressure-volume-temperature (PVT) measurements to predict acoustic properties. This was done for 468 worldwide crude oil samples from wells with low (/approximately/100) to high (/approximately/3000) GOR. The results show (1) the compressional-wave velocity (Vp) decreases as GOR increases, (2) Vp of crude oil with high GOR (e.g., 3000) can be as low as 2200 ft/sec. This crude oil velocity is much closer to the velocity of gas (1400 ft/sec) than that of water (5300 ft/sec). Therefore, bright spots can be caused by oil reservoirs with high GOR but no free gas. PVT analysis were also performed on 11 crude oil samples from seven Green Canyon wells. GOR varied from 154 to 1672. As with the worldwide data, Vp decreased with increased GOR. The wells are located in areas surveyed with three-dimensional seismic data. Bright spots associated with high GOR oilmore » reservoirs are visible on the seismic sections. These bright spots are compared to seismic amplitudes associated with reservoirs containing water, free gas, and low GOR oils.« less" @default.
- W47433928 created "2016-06-24" @default.
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- W47433928 date "1989-03-01" @default.
- W47433928 modified "2023-09-27" @default.
- W47433928 title "Bright spots related to high GOR oil reservoir in Green Canyon" @default.
- W47433928 hasPublicationYear "1989" @default.
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