Recognizing environments in the deposits of the Niger delta
- Univ. of Cambridge (United Kingdom)
The paralic sediments of the Agbada Formation are the targets of commercial exploration and exploitation of oil and gas in the Niger delta. Sedimentological and microfossil data from a middle Miocene reservoir in the delta have revealed a succession of deltaic subenvironments of deposition within a prograding offlap sequence. Ten lithofacies, comprising five sandstone, three heterolithic, and two mudstone types, are recognized from grain size, sedimentary structures, and trace fossils in two cored boreholes. Fourteen palynodebris types, including amorphous organic matter, various types of palynomorphs, and wood, were identified in the sediments. These components were subjected to principal component analysis and cluster analysis. The resulting palynofacies are integrated with lithofacies and paleoecological inferences made from the palynomorph and foraminifera contents of the sediments for paleoenvironmental reconstruction. Gamma-ray log correlation of the reservoir in uncored boreholes was carried out, using information from the cores, and this has resulted in a depositional model.
- OSTI ID:
- 7024890
- Report Number(s):
- CONF-910403-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
NATURAL GAS DEPOSITS
STRATIGRAPHY
NIGERIA
PETROLEUM DEPOSITS
DEPOSITION
EXPLORATORY WELLS
FOSSILS
GAMMA LOGGING
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGIC MODELS
MIOCENE EPOCH
NIGER RIVER
PALEONTOLOGY
PALYNOLOGY
RESERVOIR ROCK
RIVER DELTAS
AFRICA
CENOZOIC ERA
COASTAL REGIONS
DEVELOPING COUNTRIES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
MINERAL RESOURCES
RADIOACTIVITY LOGGING
RESOURCES
RIVERS
STREAMS
SURFACE WATERS
TERTIARY PERIOD
WELL LOGGING
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration