Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (1): 118-128.doi: 10.11743/ogg20120115

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Resevoir evaluation and development strategies of Daniudi tight sand gas field in the Ordos Basin

Hou Ruiyun, Liu Zhongqun   

  1. SINOPEC North China Company, Zhengzhou, Henan 450007, China
  • Received:2011-10-19 Revised:2012-01-15 Online:2012-02-28 Published:2012-03-22

Abstract:

Daniudi gas field in Ordos Basin is typical tight sand gas reservoirs with low permeability,low pressure and low production rate.It has been a challenge to develop this kind of gas field economically.This paper cove- rs lithofacies,lithology,petrophysical property,pore structure and gas bearing potential of different formations.On this basis,four types of reservoirs have been identified.In terms of production rate,TypeⅠis the highest,followed by Type Ⅱand then Type Ⅲ,while Type Ⅳ has no productivity.According to the types and distribution of reservoirs,different development strategies have been adopted.Single layer production through vertical well fits TypeⅠ,whose porosity and permeability are better,net pay is thicker and production rate is higher.Commingled system through vertical well for overlapped layers suits Type Ⅱ,whose porosity and permeability are moderate,net pay is thinner and production rate of single layer is lower.Staged fracturing through horizontal well matches both Type Ⅱand Type Ⅲ with only one widely distributing layer.Applying different development strategies to different types of reservoirs,we has succeeded in improving the individual-well production rate and achieving economical development of this gas field.Annual production capacity of 25×108 m3 has been built up there.

Key words: tight sand reservoir with low permeability, reservoir evaluation, development strategy, Upper Palaeozoic, Daniudi gas field, Ordos Basin

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