Coal occurrence and characteristics as related to environment of deposition in Cerro Negro area of Orinoco Tar Sands, Venezuela

Journal Article · Tue Mar 01 00:00:00 EST 1983 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6192342

Rodriguez, A

Sedimentological analysis of cores taken in the Cerro Negro area of the Orinoco Tar Sands have provided lithological, textural, mineralogical, and paleontological data which have enabled facies identification. These facies have been interpreted as belonging from an upper delta plain to a semi-restricted shallow marine environment of deposition. Coal beds occur in all the wells analyzed. These occurrences are closely associated with specific facies, such as the back-barrier lagoonal facies of the semirestricted environment of deposition and the backswamp facies of the delta plain. More importantly these coal beds present very distinguishable characteristics, such as variation in thickness from few inches in the back-barrier facies to 5 ft (1.5 m) in the delta plain facies. Their organic composition also ranges from micrite/atrinite to vitrinite and exinite in different proportions. Therefore, it is believed that variations in thickness and perhaps in organic composition are related to facies changes.

• Research Organization: Univ. of Toronto, Ontario
• OSTI ID: 6192342
• Journal Information: Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 67:3
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
01 COAL, LIGNITE, AND PEAT
COAL DEPOSITS
MINERALOGY
OIL SAND DEPOSITS
LITHOLOGY
VENEZUELA
DEPOSITION
GEOLOGIC HISTORY
PALEONTOLOGY
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
LATIN AMERICA
MINERAL RESOURCES
RESOURCES
SOUTH AMERICA
040201* - Oil Shales & Tar Sands- Site Geology- (-1989)
011000 - Coal
Lignite
& Peat- Reserves
Geology
& Exploration