Backsliding structures in hanging walls of listric normal faults in Dongpu sag and their significance of hydrocarbon
Chen Shuping1,2, Ji Hongying1,2, Li Wei1,2
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
Abstract：Structures formed by the overburden movement toward a master listric normal fault along a weak layer in the hanging wall are called backsliding structures. Backsliding structures were important deformation in the Dongpu sag. Based on seismic data interpretation, the characteristics of backsliding structures in the Dongpu sag, their role in trap formation, and their formation mechanisms are addressed. The backsliding structures occurred along the eastern limb of the central rise of the sag. The backsliding directions were either to the southeast or northwest depending on both the dip of master faults and the various detachment layers. Three types of backsliding were identified, including a single backsliding along one detachment, multi-layer backsliding along multi-level detachments, and an allying backsliding composed of two anti-directional backsliding. Backsliding occurred during Oligocene times. The detachment layers for the backslidings were the Carboniferous-Permian coal layers, the lower Eocene shale, and upper Eocene salt. Their low shear strength along with the overpressure caused by under-compaction and hydrocarbon generation enabled them to act as detachments. Backsliding structures formed potential hydrocarbon traps in the Dongpu sag.
陈书平, 季弘莹, 李伟. 东濮凹陷铲式正断层回滑构造及油气意义[J]. 石油地球物理勘探, 2016, 51(4): 831-840.
Chen Shuping, Ji Hongying, Li Wei. Backsliding structures in hanging walls of listric normal faults in Dongpu sag and their significance of hydrocarbon. OGP, 2016, 51(4): 831-840.
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