Lithologic Reservoirs ›› 2007, Vol. 19 ›› Issue (4): 9-12.doi: 10.3969/j.issn.1673-8926.2007.04.002

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Control of base level cycles on channel sand geometry:A case study on ZaoⅡ-Ⅲ reservoirs, Zaoyuan Oilfield

ZHANG Changmin1, YIN Taiju1, LI Shaohua1, XIONG Fujun2   

  1. 1. School of Geosciences, Yangtze University, Jingzhou 434023, China; 2. Well Logging Company, CNPC Sichuan Petroleum, Chongqing 400021, China
  • Online:2007-12-15 Published:2007-12-15

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Abstract:

Reservoirs of ZaoⅡ and Zao Ⅲ of the first member of Kongdian Formation in Zaoyuan Oilfield are dominated by channel sands developed on alluvial fans. Three long-term base level cycles and 11 middle-term base level cycles are recognized in ZaoⅡ and ZaoⅢ reservoirs, and each middle-term cycle is composed of one to five short-term base level cycles. Short-term cycles can be divided into high and low accommodation space cycles which represent two kinds of channel sand bodies with ifferent characteristics. Middle-term cycles can be classified into symmetry and asymmetry types. Sediments at high accommodation stage of long-term cycle are mainly mud, with single channel inserted in. With the rise of the long-term base level, the ratio of width to thickness of sand bodies increases and sand content decreases.

Key words: shallow lacustrine delta, lithologic reservoirs, sheeted distributary channels, high resolution sequence stratigraphy, sedimentary mode, Putaohua Formation, Songliao Basin

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