Controls of Tan-Lu Fault on Paleogene Depositional System in Qingdong Sag

Abstract

Abstract: Qingdong sag was shaped in Paleogene companied by Tan-Lu fault activity. So the structural activity, specially syndepositional faults and their combination patterns controlled the development and distribution of stratigraphic and depositional systems. Continuing activity of F and F1 fault zones in the Paleogene controlled depositional filling of the northern deep sub-sag, while F2 and F4 fault zones separately controlled development of middle and southern secondary sub-sags. The slope break zone of fault formed by long-term activity of syndepositional faults constituted the boundary of depositional systems and controlled the distribution of Paleogene sedimentary facies. The slope break zone of fault formed by the eastern basin marginal fault controlled development of coarse-clastic depositional systems, such as sublacustrine fan, fan delta and braided delta. The syndepositional faults of F1, F2, F3 and F4 are generally boundaries between sedimentary facies. The slope break zone of faults formed by main syndepositional fault adjacent to oil generating depression has favorable conditions for formation of sandstone reservoirs, and the eastern basin marginal fault zone and F1 fault gentle-slope zone of northern subswell are favorable sites of looking for potential sandstone reservoirs.

Key words: Tan-Lu fault, syndepositional fault, Paleogene, sedimentary system, distribution

CLC Number:

TE111.1

LI Chun-rong, XIN Ren-chen, LI Jian-ping, LIU Hao. Controls of Tan-Lu Fault on Paleogene Depositional System in Qingdong Sag[J]. Xinjiang Petroleum Geology, 2008, 29(2): 209-213.

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