Characteristics of Paleogene Slop-breaks in Qikou Sag and It′s Controlling Effect on Sedimentation

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  • Exploration and Development Research Institute of Dagang Oilfield, PetroChina, Tianjin 300280, China

Received date: 2011-11-30

  Revised date: 2012-02-03

  Online published: 2012-04-10

Abstract

The Paleogene Qikou sag is a typical half-graben,with slope setting wide spread and several different genetic-type slope-breaks (i.e.faulted,flexure,eroded & sedimentary).Based on high resolution 3D seismic interpretation,we analyzed structure characteristics,evolutionary process & genetic origin of each type of the slope-break.The genetic origin of slope-break in the Qikou sag is of tectonic,sedimentation and erosion.The tectonic slope-break is controlled by characters and styles of faults,associated with simple and multi-step.The formation and evolution of slope-break was controlled by tectonic events including stretch in cap-rock,paleo-structure & strike-slipe in the Paleogene base-rock.The trench gap or transfer zone generated by tectonic events played as the channels for sedimentary input and diffusion.The slope-break made the sedimentary faces separate each other.Both amounts of sedimentary provenances and slope character constrain the stack style and the affected area of the sedimentary provenances.

Cite this article

ZHANG Zhi-pan, LU Yi, FU Li-xin, LIAN Mei, WANG Hui, CHEN Bao-xian . Characteristics of Paleogene Slop-breaks in Qikou Sag and It′s Controlling Effect on Sedimentation[J]. Natural Gas Geoscience, 2012 , 23(2) : 284 -290 . DOI: 10.11764/j.issn.1672-1926.2012.02.284

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