利用测井资料分析成岩作用对储集层的影响

Application of Well Logging Information to Analysis on the Effect of Diagenesis in Reservoirs

应用测井资料进行压实作用、孔隙演化、裂缝、矿物成分详尽分析基础上 ,结合成岩作用各个阶段对储集层性能影响的研究 ,讨论了应用测井资料分析成岩作用对储集层影响的物理基础 ,进而指出应用测井资料分析成岩作用不同阶段对储集层影响的可行性。方法为 :(1 )成岩作用早期 :应用孔隙度测井和岩性测井资料 ,通过压实曲线分析压实作用区间 ;(2 )成岩作用中期 :首先根据孔隙度测井资料分析声波孔隙度、密度 -中子测井孔隙度 ,分析次生孔隙 ,并应用交会图技术 ,确定矿物成分 ,分析胶结、交代作用形式和强度 ,然后根据泥质指示测井确定泥质含量 ,进一步利用自然伽玛能谱测井 ,尤其是Th、K含量分析粘土矿物 ;(3)成岩作用晚期 :进行次生孔隙、裂缝、颗粒成分与含量、粘土矿物分布规律研究。以上分析方法经吐哈盆地实际资料验证 。

Based on the analysis of compression pore evolution, fracture, mineral component and the study of effect of diagenesis stages on reservoirs, the physical base of effects of diagenesis stages on reservoirs is discussed by applying well logging information. These results indicate that the effect of diagenetic stages on reservoirs are available by means of well log information. The method include as fellows:(1) In Early diagenesis stage, the porosity and lithology well logging data are applied to analysis compression curve, and to determine the compression area. (2) In Middle diagenetic stage, first, it is used to analysis the secondary pores by means of acoustic porosity and density-neutron porosity. The crossplot technique is used to determine mineral component and the types of cementation and replacement. The mud content is able to be determined by means of mud indication log. The clay mineral can be studied by using the gamma spectrometry, special thorium, and potassium content. (3) In the late diagenetic stage, the distributions of secondary pore, fracture, grain component, grain content and clay mineral can be researched by logging. The above methods are tested in Th-Ha basin and show an ideal effect.