徐家围子地区酸性火山岩储层流体识别方法研究

Study on the fluid identification method of acidic volcanic rock reservoir in Xujia Waizi area

徐家围子地区火山岩储层主要分布在中生代白垩系下统营城组地层,为岩性构造气藏,无统一气水界面,气水关系较为复杂。储层埋藏深度大,物性差,非均质性强,储层流体多样,含二氧化碳气的火山岩储层电阻率较低,往往被误判为水层。本文针对以上难点,根据天然气对三孔隙度测井曲线的影响,并结合取心、录井、试气等资料,应用岩心刻度测井,提出了三孔隙度组合、交会图和核磁共振法判别等三种流体识别方法,综合判断火山岩储层的流体性质。

The volcanic rock reservoirs in Xujia Waizi area are mainly distributed in the formation of the city under the Cretaceous system of the Mesozoic Dynasty,which is a rock-based tectonic gas reservoir,without a unified gas-water interface,and the gas-water relationship is more complex.Reservoir buried depth is large,poor materiality,non-homogeneous,reservoir fluid diversity,carbon dioxide-containing volcanic rock reservoir resistivity is low,often misjudged as a water layer.In this paper,according to the above difficulties,according to the impact of natural gas on the three-porosity logging curve,and combined with the data such as heart extraction,logging,test gas,the application of rock heart scale logging,proposed three-porosity combination,rendezvous map and nuclear magnetic resonance method to determine the three fluid identification methods,comprehensive judgment of the fluid properties of volcanic rock reservoir.