Accommodation Zones and Their Controls on Depositional System in the Middle of Third Member of Shahejie Formation, South of Dongpu Sag

Abstract

Abstract:

Dongpu sag is a Cenozoic extend-faulted basin formed by extension contributed by Lanliao fault. Accommodation zones are main types of transfer zones developed in south of Dongpu sag. Based on fault-s configuration and displacement, four tendency types and three overlap types are summarized; moreover, eleven types of accommodation zones are confirmed, among which eight are found in south of Dongpu sag. Accommodation zones control the development of depositional systems in south of Dongpu sag: Synthetic accommodation zones formed in west slope can act as a sediment exit of large delta system; Fault-nose in degressive block of Lanliao fault can also play as an exit of relatively small fan delta system; Antithetic accommodation zones in central uplift zone, however, separate secondary catchment basins. The forming dynamics mechanism of accommodation zones is closely correlative with geometry and kinematics of Lanliao fault, whose cross section shape, displacement variation and strike-slip are the domain controlling factors.

Key words: Dongpu sag, accommodation zone, depositional system, formation mechanism

CLC Number:

TE122

LIANG Fu-Kang, XU Xin-He, MU Xiao-Shui, LI Sheng-Li, XU Shu-Tang, LIU Wei. Accommodation Zones and Their Controls on Depositional System in the Middle of Third Member of Shahejie Formation, South of Dongpu Sag[J]. Geoscience, 2011, 25(1): 55-61.

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