松南气田火山岩储层流体性质的识别

利用测井资料识别火山岩储层流体性质一直是困扰测井评价的难题。针对火山岩储层岩石成分、结构和气水关系复杂，孔隙空间分布极不均匀，储层具有很强的非均质性以及低孔、低渗的特点，采用核磁—密度测井综合法、横波（纵波）—合成横波（合成纵波）重叠法、压缩系数—泊松比重叠法及压力梯度法识别松南气田流体性质，取得了较好的效果。研究表明，由于各种测井方法在不同的孔隙—裂缝系统中的响应机制不同，天然气识别的效果存在明显的差异，总结了各类储层的气层识别方法。

RESERVOIR FLUID PROPERTY IDENTIFICATION OF VOLCANIC ROCK IN SONGNAN GAS FIELD

The complexity of volcanic reservoir rock component,structure,and gas-water relationship,multiplicity and highly uneven random distribution of pore space result in the strong heterogeneity,low porosity and low permeability of the reservoir,so gas identification is always a challenge to logging reservoir evaluation.In this paper,NMR-density logging method,synthetic S-wave logging overlapping,compression coefficient-Poisson ratio overlapping and pressure gradient method are adopted to identify gas layers in igneous reservoir,and good effects have been achieved in the identification of the fluid property in Songnan gas field.Research shows that the response mechanism of the logging methods in different pore-fracture system is different,resulting in significant difference in result of natural gas identification.For different reservoir characteristics,different gas layer identifying methods are used,and better identification result can be achieved in igneous reservoir.