洪浩尔舒特凹陷火山岩储层特征研究

RESERVOIR CHARACTERISTICS OF VOLCANIC ROCK IN HONGHAOERSHUTE DEPRESSION

二连盆地洪浩尔舒特凹陷白垩纪火山岩分布广,岩性主要为安山岩、凝灰岩和少量火山角砾岩;岩相分为爆发相、溢流相、喷发沉积相三个亚相;储集空间类型有原生储集空间和次生储集空间及裂缝;储集空间和岩性的差异决定着储集性能的优劣,安山岩储集性能最优越。研究发现,火山岩储集性能受岩性、岩相、成岩作用、构造活动、古地貌特征及风化作用等多因素影响,利用构造研究、属性优选和储层参数反演等手段进行有利储层预测和评价,具有很好的效果,提高了勘探成效。

In Erlian Basin, the Cretaceous volcanic rock is widespread in Honghaoershute depression and is mainly composed of andesite, tuff and a little volcanic breccia. There are three kinds of explosive, overflow and eruptive subfacies. The reservoir space contains original and secondary reservoir space and fracture. In addition, the difference of both reservoir space and lithology may control reservoir property. Results illustrate that: (1) for the volcanic rock, its reservoir property is controlled by lithology, lithofacies, diagenesis, tectonic activity, palaeogeomorphy and weathering; (2) to use structural analysis, attribute optimization and reservoir-parameter inversion can predict and evaluate reservoir very well.