Productivity log forecasting of low permeability gas reservoir of Shihezi Formation in X area of Ordos Basin

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  • 1.Key Laboratory of Exploration Technologies for Oil and Gas Resources of Education Ministry of
    Yangtze University,Wuhan 430100,China;2.Geophysics and Oil Resource Institute,Yangtze University,
    Wuhan 430100,China;3.CNOOC Research Institute,Beijing 100027,China;4.Institute of Petroleum
    Exploration and Development,PetroChina Tarim Oilfield Company,Korla 841000,China

Received date: 2016-06-29

  Revised date: 2016-08-09

  Online published: 2019-09-06

Abstract

The process of oil-gasfield exploration and development,productivity log forecasting of low permeability gas reservoir is a key and difficult point.On the basis of log,testing and core experimental data,firstly,according to the different production measure,the lower limit of reservoir physical property is determined.Reservoirs with porosity and permeability greater than 10% and 1×10-3μm2,respectively,have natural productivity,and reservoirs with porosity and permeability less than 6% and 0.1×10-3μm2,respectively,have no productivity.Secondly,according to the production condition,productivity is divided into natural productivity,post-frac AOF>10 000m3/d,post-frac AOF 3 000-10 000m3/d and post-frac without production.Their log characteristics of different productivity levels are studied,and using GR,φD-N,porosity and permeability,four productivity levels can be forecasted.Then followed by permeation fluid mechanics and capillary theory,the relationship of post-frac AOF per meter and efficient flow pore,calculated by NMR,is index,and the model can be established.Finally,productivity of low permeability gas reservoir of Shihezi Formation in X area of Ordos Basin is calculated and the forecast results accord with test results well,and the relative error is less than 10%.

Cite this article

Chen Yu-long, Zhang Chong, Shi Wen-rui, Guo Ji-ning, Qin Rui-bao, Yu Jie, Zhou Xing-bo . Productivity log forecasting of low permeability gas reservoir of Shihezi Formation in X area of Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(12) : 2216 -2222 . DOI: 10.11764/j.issn.1672-1926.2016.12.2216

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