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Hydrocarbon possibilities of concealed Mesozoic-Paleogene sediments below Himalayan nappes - reappraisal

Journal Article · · Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:5411279
 [1];
  1. Geological Survey of India, Dimapur
+ Show Author Affiliations
Hydrocarbon exploration of the Ganga (Ganges) and Sub-Himalayan basins indicates the presence of upper Neogene-Quaternary continental molasse and the absence of Paleogene sediments regarded as hydrocarbon source beds. Marine to brackish water Paleogene-lower Neogene sediments, closely fringing the Sub-Himalayan foothills, increase in thickness northward. Their presence and facies in the frontal schuppen zone and in the Lesser Himalayan windows, commonly in close association with upper Mesozoic shelf sediments, indicate a formerly greater width for the late Mesozoic-early Neogene shelf-miogeosynclinal basin. The pre-Tertiary rocks of the Lesser Himalayas are in nappes floored by the flat-lying sole thrust redesignated the Main Boundary thrust (MBT). Schuppen structure and lateral shortening complicate the geometry of the MBT. Pre-Tertiary tectonic grain and metamorphism, ubiquitously developed within the Lesser Himalayan cover rocks, are typically absent in the subjacent Paleogene-lower Neogene window-zone sediments. This opinion is corroborated by a few oil and gas shows from the Eocene limestone outcrops close to the MBT and also from the Lesser Himalayan pre-Tertiary metamorphic cover rocks.
OSTI ID:
5411279
Journal Information:
Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 66:1; ISSN AAPGB
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ASIA
CARBONATE ROCKS
CENOZOIC ERA
DEVELOPING COUNTRIES
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC STRUCTURES
INDIA
LIMESTONE
MESOZOIC ERA
METAMORPHISM
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SOURCE ROCKS
TECTONICS
TERTIARY PERIOD