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火山岩油气藏是近年来吐哈油田热点勘探领域,已相继在不同层系的火山岩储层中取得了突破。而火山岩储层岩性复杂多变,其岩性的影响远远超过流体的影响,因此岩性识别对该地区显得尤为重要。准确确定火山岩岩性是火山岩岩性储层精细评价的基础,也是测井评价的主要难点。文中以三塘湖盆地马朗凹陷石炭系卡拉岗组火山岩岩石薄片资料为基础,研究出了利用常规测井信息识别矿物成分,应用成像测井信息识别火山岩的岩石结构及构造,并将两者结合对火山岩岩性进行综合判别的适合吐哈油田火山岩岩性识别方法。该方法对马朗凹陷火山岩岩性识别具有较好的应用效果。
Volcanic reservoirs are hotspot exploration areas in Tuha oilfield in recent years, and breakthroughs have been made successively in volcanic reservoirs of different strata. The lithology of volcanic reservoirs is complicated and changeable, and the influence of lithology is much more than that of fluids. Therefore, lithology identification is particularly important in this area. Accurately determining volcanic lithology is the basis of fine evaluation of volcanic lithologic reservoirs and also the main difficulty of logging evaluation. Based on the information of volcanic rocks from the Carboniferous Karakang Formation in the Malang Sag, Santanghu Basin, the authors used the conventional logging information to identify the mineral composition and the imaging logging information to identify the volcanic rock structure and structure. Combined with lithology discrimination of volcanic rocks, it is suitable for lithologic identification of volcanic rocks in Tuha oilfield. This method has a good application effect on lithology identification of volcanic rocks in the Malang sag.