西南石油大学学报(自然科学版)

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Identification of Channel Sand in W Oilfield of Llanos Basin

Hu Junfeng1*, Feng Fang1, Yang Jiangfeng2, Chen Dong3   

  1. 1. International Petroleum Exploration and Production Corporation,SINOPEC,Chaoyang,Beijing 100029,China
    2. Geophysical Research Institute,SINOPEC,Nanjing,Jiangsu 211103,China
    3. Exploration and Production Research Institute,SINOPEC,Haidian,Beijing 100083,China
  • Online:2015-12-01 Published:2015-12-01

Abstract:

CC5
sand deposited in the Member C5 of the Carbonera formation is the main production layer of W oilfield in
Llanos basin of Southern America. Low relief structure-lithologic reservoir came into being when the CC5
sand is located at
favorable structure. Because of the thin thickness and the rapid variation of sand thickness,precision of reservoir prediction
should be improved,otherwise,drilling effect will be affected directly.“Five-step”technical idea has been proposed to resolve
this problem. First,strata slice analysis portrays the trend of sand distribution. Second,seismic forward modeling builds the
knowledge of tuning effect and seismic response of the channel sand. Third,high resolution seismic process method is used to
improve resolution of the seismic data. Fourth,spectrum decomposition is applied to study the tuning effect of CC5
sand of this
area. At last,CSSI inversion method is adopted to characterize the target sand body and the surrounding rock quantitatively.
All the study demonstrates that CC5
sand of number 2 channel is thicker than number 1 channel at the main part of channels. The
prediction has been verified by the new well W C4F. As a result,preliminary study is updated,leading to the discovery of
new reservoir. This idea has not only presented the sand body distribution in the channel,but also solved the problem of how
to predict sand body thickness quantitatively. And the systematic application of it to C area provides a detailed reference to the
arrangement of exploration well sites.

Key words: Llanos Basin, low relief structure, lithologic reservoir, tuning effect, high resolution, spectrum decomposition,
inversion

CLC Number: