应用测井资料识别火山岩储层流体性质的方法

A VALID INTERPRETATION METHOD WITH LOGGING FOR FLUID PROPERTY IDENTIFICATION IN VOLCANIC RESERVOIR

大庆徐深气田火山岩储层由于矿物成分多样、热蚀变影响等造成岩石含氢指数较高，骨架对中子测井的影响甚至超过了流体的影响，常用的中子孔隙度—密度孔隙度交会法识别气层已不适用。核磁共振测井主要测量的是孔隙流体中氢的含量，基本不受岩石骨架的影响。由于储层含气，使核磁共振测井确定的孔隙度小于地层真实孔隙度，而使密度测井计算的孔隙度大于地层真实孔隙度，这一特性有利于识别气层。因此，提出了应用密度孔隙度—核磁孔隙度差值和电阻率等参数识别火山岩储层的气水层方法，经试气结果证实，提高了流体识别精度。

The various volcanic mineral components cause rock hydrogen content in a high level in Daqing Xushen gas field, neutron log response from volcanic matrix mineral is even stronger than from fluid in the volcanic rocks. The normal neutron - density crossplot is unsuitable for identifying gas reservoir. Nuclear Magnetic Resonance Log measures hydrogen content of reservoir too, but major response of the hydrogen content is from fluid in the res- ervoir pore space, in general the response from reservoir matrix is slight. For the gas contenting in the reservoir, NMRL porosity is smaller than real porosity, applying this specific property wilt benefits gas reservoir identifica- tion. The authors propose several methods for gas reservoir identification, it contents NMRL-density differential a- nalysis and resistivity parameters, and so on methods to interpret volcanic gas reservoir. Results of the well tests show that applying the methods improve gas and water reservoir interpretation accuracy.