测井资料识别子洲气田气水层方法研究

Study on the identification method of gas and water zone by using well logging data in Zizhou Gasfield

运用测井资料识别气田不同井区的气层、水层及干层分布是气田勘探开发中基本任务之一。在子洲气田山2气藏开发过程中,由于其气水分布受构造、储集层砂体变化的控制,必须综合考虑各类因素进行识别。在简述子洲气田深层气测井响应特征的基础上,分别用声波时差-深侧向电阻率交会图、补偿中子孔隙度-密度交会图、地层水孔隙度法、多元判别法,建立判别储集层流体性质的模型并用于对山2段储集层流体性质进行判别。对比试气结果可知,判别符合率均较高,分别为87.91%、81.7%、84.6%和85.71%。通过实际应用证明,上述方法对子洲气田的气水层解释具有很好的效果。

It is one of the fundamental tasks to identify the distribution of gas,water and dry zones by using well logging data for different well area of the gasfield in gasfield exploration and development.During the development of Shan 2 gas reservoir in Zizhou Gasfield,all sorts of factors should be considered comprehensively in well logging recognition as the gas and water distribution is dominated by the structure and the alteration of sandbody condition.On the basis of brief introduction of characteristics in deep layer gas logging response,the models to discriminate the reservoir fluid properties were established by using acoustic interval transit time-deep lateral resistivity crossplot,compensated neutron porosity-density crossplot,formation water porosity method and multiple discriminating method respectively,and the models were used to discriminate the reservoir fluid properties in Shan 2 interval.Compared with gas testing results,the discriminating rates are higher and have reached to 87.91%,81.7%,84.6% and 85.71%.The practical application approved that the above methods have a good interpretation effect on gas and water zones in Zizhou Gasfield and can be widely used in similar adjacent reservoirs.