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Recognition and evaluation of hydrocarbon reservoir in foreshore area of Liaohe Oilfield

Sun Na(Exploration and Development Research Institute,Liaohe Oilfield Company,CNPC,Panjin 124010,China).  
The brine drilling mud,which contains chlorination potassium additive,will seriously influence the response of well logging.It is more difficult for well logging to interpretation and evaluation of hydrocarbon layers,because this kind of mud was adopted widely in the foreshore area.After studying the geology features and the drilling mud and logging data of this area,it is revealed that the mud salinity is about 80~140gramme per litre and the resistivity decreases greatly because of the invasion of mud filtrate.There is a great deal of chlorination potassium additive in the mud,which will affect the accuracy of the neutron log and lower the precision of the measurement.The Array Induction Log overcomes the influence of mud filtrate invasion,and acquirs invaded depth and the ture resistivity of the reservoir.On the other hand,the Nuclear Magnetic Logging tool was applied to compute the porosity of bounded fluid and movable fluid.In this paper,a appropriate method was put up for the oil and gas reservoir recognition and evaluation,and the better results have been acquired in the practice..
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