西南石油大学学报(自然科学版)

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Turbidite Sedimentary Characteristics of Surennuoer Oilfield in
Hailaer Basin

Su Xiangguang*   

  1. Exploration and Development Research Institute,Daqing Oilfield Company Ltd.,PetroChina,Daqing,Heilongjiang 163712,China
  • Online:2015-04-01 Published:2015-04-01

Abstract:

Through the study of the lithology combination,grain size analysis,heavy minerals assemblage characteristics and
the faults activities of Nantun II formation in Surennuoer Oilfield,the sedimentary characteristics and generation mechanism
of the turbidite are analyzed. The results indicate that the Nantun II formation turbidite from Surennuoer Oilfield is mainly
sourced by the pro-delta sand bodies on both the west and east side of the depression,with the western provenance as the
primary one. The lithology is composed of dark grey middle to fine grain size sandstone and siltstone,with positive rhythm,
usually embedded within the dark grey lacustrine shale. The contact between the shale and the sand bodies is quite sharp,and
the B section of the Bauma sequence is commonly seen,and the scour surface is seen at the bottom. The C –M chart and the
statistics curve of grain sizes are characterized by typical turbidite. When the Nantun II formation was deposited,the faults,
which control the depression,were quite active and the resulting seismic activities could be the external mechanism for the
slump. For syn-depositional pro-delta sand bodies located within the faults active areas are prone to the secondary migration,
resulting a series of slump turbidite sand bodies which are perpendicular to the strike of the faults. The results provides some
guidance for the further exploration and evaluation in Hailaer Basin.

Key words: Surenuoer Oilfield, Nantun II Formation, turbidite, sedimentary characteristics, generation mechanism