The Villeta-Caballos( ) petroleum system of the Neiva Area, upper Magdalena Valley, Colombia
- Exxon Exploration Company, Houston, TX (United States)
The Villeta-Caballos( ) petroleum system of the Neiva area covers 5120 km[sup 2] and includes 18 fields with ultimate recoverable reserves of 83.8[times]10*6 m[sup 3] (527 million bbl) of oil and 5.7[times]10*9 m[sup 3] (201 billion ft[sup 3]) of gas. Sedimentary rocks range in age from Aptian through Holocene, and were deposited in rift, margin-sag, and foreland basins. The hydrocarbons were sourced mainly from two intervals within the Albian-Santonian Villeta Formation and migrated from the footwall of the Chusma fault and the center of the Neiva syncline beginning at the end of the Oligocene to the present. The two main reservoirs are Cretaceous sandstones of the Caballos and Monserrate formations. Secondary reservoirs of significance are the Miocene fluvial sandstones of the Honda Group. The traps are mainly structures associated with the formation of a fold and thrust belt which began in the Oligocene and is still active. The system extends in time from the Aptian (-110 Ma) to the present. The first event was the deposition of the lower Caballos reservoir. The source rock was deposited a few million years later and reached maturity in synchronism with the formation of structural traps during the last 25 m.y. Destruction of some of the accumulations, by uplift and erosion in the fold belt, started in the Miocene. The volume of the hydrocarbons generated by the system was calculated using an average TOC content of 2.1 wt% for 235 m of total source interval in two intervals, and an area of mature source of 1650 km[sup 2]. A hydrocarbon generation of 325 mgHC/gTOC was used based on the Hydrogen Index measurements of immature Villeta source rock and a hydrocarbon generation algorithm. The efficiency of the system and the percentage of hydrocarbons generated that are present in discovered traps was determined to be about 10%.
- OSTI ID:
- 6066031
- Report Number(s):
- CONF-930306-; CODEN: AABUD2
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 77:2; Conference: International congress of the American Association of Petroleum Geologists (AAPG), Caracas (Venezuela), 14-17 Mar 1993; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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PETROLEUM DEPOSITS
HYDROCARBONS
ORIGIN
PRIMARY RECOVERY
CALCULATION METHODS
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NATURAL GAS
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