Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (3): 37-44.doi: 10.12108/yxyqc.20190305

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics of near-source braided river delta of the upper third member of Shahejie Formation in Kenli A oilfield

ZHAO Hanqing, WEN Huiyun, MU Pengfei, LI Chao, WU Qiongyuan   

  1. Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Limited, Tianjin 300459, China
  • Received:2018-11-05 Revised:2019-01-29 Online:2019-05-21 Published:2019-05-06

Abstract: In order to reveal the sedimentary characteristics and distribution regularity of the upper third member of Paleogene Shahejie Formation in Laizhou Bay Sag, Bohai Bay Basin, the sedimentary facies types and distribution characteristics under sequence framework were summarized by using core, grain size, casting thin section, mud logging and seismic data. The results show that a typical near-source braided river delta sedimentary system developed in Kenli A oilfield. Three kinds of subfacies were recognized, including braided river delta plain, braided river delta front and pro-braided river delta, which can be further divided into the following six sedimentary microfacies:braided channel, alluvial plain, underwater distributary channel, underwater distributary interchannel, mouth bar and sheet sand. By using sequence stratigraphy, the upper member of Sha 3 was divided into a set of third-order sequence. The lowstand systems tract (LST) was dominated by thick sandstone in underwater distributary channel, while the transgressive systems tract (TST) and highstand systems tract (HST) were dominated by thin sandstone. Sandstone thickness and distribution scale in different systems tracts were controlled by lake level fluctuation and sediment supply rate. This rule can provide a reference for the evaluation of sandstone reservoir in the gentle-slope zone of faulted lacustrine basin.

Key words: near-source braided river delta, sedimentary characteristics, sequence stratigraphy, Bohai Bay Basin

CLC Number: 

  • TE122.2
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