Method for determining oil and water saturation in

专利名称：Method for determining oil and water

saturation in earth formation surrounding aborehole

发明人：Roscoe, Bradley,Stoller, Christian申请号：EP914011.5申请日：19910507公开号：EP0465276B1公开日：19961002

摘要：A method and an apparatus for determining the hydrocarbon saturation So inan earth formation surrounding a borehole, and/or the hydrocarbon saturation Cb in saidborehole, comprising: irradiating the formation with a source of neutrons of sufficientenergy to interact with atoms of the formation and the borehole, according to inelasticneutron reactions;- detecting the resulting gamma rays at a near detector and a fardetector;- expressing the measured carbon (C) and oxygen (O) yields respectively as afirst and second linear function of So, Sw the water saturation in the formation, Cb and/orCo water saturation in the borehole;- combining the respective carbon and oxygen yields(Cn, On) for the near detector, and the respective carbon and oxygen yields (Cf, Of) forthe far detector so as to form the differences Cn - On and Cf - Of; and - solving for theunknowns So and Cb. Alternately, in case either So or Cb is known from another source,one can use a single detector.

申请人：SCHLUMBERGER LTD,SCHLUMBERGER SERVICES PETROL,SCHLUMBERGERHOLDINGS

地址：US,FR,VG

国籍：US,FR,VG

代理机构：Stoole, Brian David

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