Control of the Syndepositional Fault on Depositional Fillings of the Dongying Formation in Northern Liaodong Bay

doi:10.11885/j.issn.1674-5086.2018.07.18.02

Abstract

Abstract: To investigate the control of the syndepositional faults on the depositional fillings in the lower Ed₂, regional core analysis data, drilling logs, and seismic data from the northern section of the Liaodong Bay Depression were used to analyze sequence division, changes in activity level of synsedimentary faults, and controlling effect on the axial meandering river deltasublacustrine fan sedimentary filling evolution in the lower Ed₂ segment layer. The lower Ed₂ segment layer was shown to be comprised of three layers that can be divided into lowstand+transgressive system tracts and highstand systems tracts according to the flooding surface. In the lower+transgressive system tracts, the meandering river delta developed in the high sedimentation rate stage due to syndepositional fault activity. The difference in stratum thickness between the two sides of the fault was significant, and the turbidity formed by the slump showed strong amplitude, low frequency, and high continuity on seismic section. According to the drill logging calibration, the logging curve exhibited a tooth shape with medium to high amplitude and the lithology was mainly siltstone and mudstone without obvious depositional structure. The meandering river delta in the highstand systems tracts formed in the low sedimentation rate stage due to syndepositional fault activity. The difference in the stratum thickness between the two sides of the fault was negligible, and the turbidity formed by the slump was characterized by a vermicule chaotic reflection with weak amplitude on seismic section. The logging curve exhibited bell or funnel shapes of medium to low amplitude and the lithology was predominantly medium coarse sandstone with gravel present in local areas. In addition, the depositional structure was shown to be dominated by soft-sediment deformation structure.

Key words: syndepositional fault, meandering river delta, sublacustrine fan, Ed₂ segment, Liaodong Bay Depression

CLC Number:

TE122

XIA Shiqiang, LIN Changsong, DU Xiaofeng, LI Junqian, LI Hong. Control of the Syndepositional Fault on Depositional Fillings of the Dongying Formation in Northern Liaodong Bay[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 19-32.

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