二连盆地白垩系火山岩储层特征及有利储层预测

Reservoir Characteristics and Favorable Reservoir Prediction for Cretaceous Volcanic Rock in Honghao’ershute Depreesion of Erlian Basin

通过岩心、岩屑及显微结构观测,系统分析了二连盆地洪浩尔舒特凹陷火山岩储层的岩石学特征、储集空间特征及其影响因素。研究结果表明,岩性主要为安山岩,其次为凝灰岩和少量火山角砾岩,岩相主要有爆发相、喷溢相、喷发沉积相和火山通道相,储集空间类型主要有原生气孔、次生溶孔、裂缝及其组合型,储层物性主要受火山岩岩相类型、成岩作用和构造活动影响,其中以岩相和构造影响最为明显,结合地震储层参数反演预测结果,认为该凹陷中央洼槽靠近断裂附近的喷溢相为火山岩有利储层发育区。

The paper systematically analyzes the petrology characteristics,reservoir space characteristics and influence factors of volcanic rock reservoirs in Honghao’ershute depression of Erlian basin based on the observation of core,debris and microscope structures.The result shows that the lithology is composed of andesite which is the most,tuff which is the second and a little of volcanic breccia;the lithofacies include explosive facies,effusive facies,eruption-deposition facies and volcanic conduit facies;the reservoir spaces are composed of primary pores,secondary pores,fractures and their combination;reservoir property is mainly affected by volcanic rock lithofacies,diagenetic action and tectonic movement,in which the effect of lithofacies and tectonic movement is most obvious.The study result in combination with seismic reservoir inversion results shows that it is considered that the effusive facies near the faults of middle depression is the favorable reservoir zone.