--> Abstract: Tectonics and Stratigraphy of the Greater Bohai Bay Basin, China, by C. Wu and G. Murray; #90933 (1998).

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Abstract: Tectonics and Stratigraphy of the Greater Bohai Bay Basin, China

Wu, Changlin - Kerr-McGee Oil and Gas Corporation; Murray, Gene - Kerr-McGee China Petroleum Ltd.

The greater Bohai Bay basin is the second largest petroleum producing province of China. It covers an area of 7,300 square kilometers and consists of more than 50 sub-basins. The annual petroleum production from the basin is about 1 MMBO, and the reserves are about 200 MMBOR equivalent.

The basin was created by subduction of the west Pacific Plate under the Eurasian passive margin in the early Tertiary. Intensive crustal doming and dip-slip rifting created half-grabens and ?buried-hills.? The ?buried-hills? were eroded and became focal points for hydrocarbon accumulation. The half-grabens acted as depocenters and also kitchen centers for oil generation. Most of the half-grabens were filled with up to 5,000 meters of Eocene lacustrine shale, Oligocene deltaic sandstone, and late Tertiary alluvial-fluvial interbedded sandstones and mudstones. The entire Tertiary succession is a tripartite fluvial-lacustrine-fluvial facies that was driven by regional tectonic evolution. Nested in the succession are numerous depositional sequences that were probably driven by high-frequence lake level changes. Conventional seismic reflection profiles tied to well log and core data allow the identification of both basin-scale sequences and meter-scale cycles.

AAPG Search and Discovery Article #90933©1998 ABGP/AAPG International Conference and Exhibition, Rio de Janeiro, Brazil