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Title: Sedimentary basins and petroleum occurrences, Mongolia

Mongolia is situated on the southern margin of the Siberian craton. Successive tectonostratigraphic terrain accreted to the Laurasian, Siberian craton during the proto-Tethys, paleo-Tethys, and neo-Tethys. These terrains have been described as micro-plates made up of continental, ocean basin and volcanic-arc fragments docking onto the Siberian craton. Extensive, post-accretionary rifting developed during extensional periods of opening and closing of paleo-Tethys and neo-Tethys. Rift and graben deformation was initiated in the Upper Jurassic. Rift-fill included conglomerates, breccias, and volcanics. During the Lower Cretaceous, continental deposits with lacustrine clastics continued as the rift-fill sequence. The Upper Cretaceous continental sediments are related to the wrench-rifting, compressive phase. Geophysical data (gravity, magnetics, and seismic) are used with surface, regional geology, and subsurface well data to illustrate the Mesozoic rift basins' geometry, the thickness of sediments, and the existing type of hydrocarbon traps. The Upper Jurassic-Lower Cretaceous shale-sandstone sequence contains the known source rocks and reservoir rocks in the southeastern and eastern part of Mongolia. These rocks are described and their structural and stratigraphic relationship are illustrated. The known oil occurrences are surface oil seeps, impregnated outcrops, oil shows in core holes and in samples, and cores in exploration wells. The two oil fields thatmore » have been discovered in Southeastern Mongolia, Tsagaan-Els and Zuunbayan, are described.« less
Authors:
; ;  [1]
  1. (Exploration Associates International of Texas, Inc., Houston (United States))
Publication Date:
OSTI Identifier:
7025190
Report Number(s):
CONF-910403--
Journal ID: ISSN 0149-1423; CODEN: AABUD
Resource Type:
Conference
Resource Relation:
Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States); Journal Volume: 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; MONGOLIAN PEOPLES REPUBLIC; PETROLEUM DEPOSITS; PETROLEUM GEOLOGY; CRETACEOUS PERIOD; GEOLOGIC HISTORY; GEOLOGIC TRAPS; JURASSIC PERIOD; PLATE TECTONICS; RESERVOIR ROCK; RIFT ZONES; SEDIMENTARY BASINS; STRATIGRAPHY; ASIA; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; GEOLOGY; MESOZOIC ERA; MINERAL RESOURCES; RESOURCES; TECTONICS 020200* -- Petroleum-- Reserves, Geology, & Exploration