马朗凹陷条湖组凝灰岩致密储层特征及形成条件分析

发布时间：2018-03-31 05:33

本文选题：凝灰岩　切入点：脱玻化　出处：《岩性油气藏》2017年03期

【摘要】：马朗凹陷条湖组凝灰岩致密油藏是近年来三塘湖盆地的重点勘探领域之一,明确其储层特征及形成条件对于深化三塘湖盆地凝灰岩致密油勘探具有重要意义。以岩心观察、薄片鉴定和全岩矿物分析为基础,结合场发射扫描电镜和毛管压力曲线等资料,开展储层微观特征研究,同时,采取井震结合方法,利用振幅、频率属性预测凝灰岩致密储层分布。结果表明:马朗凹陷条湖组凝灰岩致密储层主要由晶屑、玻屑组成,且富含有机质,脱玻化孔发育,具有中孔、特低渗、高含油饱和度的特征;缺少陆源碎屑物质供应的相对稳定的浅湖—半深湖环境是凝灰岩致密储层形成的关键;距离火山机构一定范围内的火山洼地控制着有效凝灰岩致密储层的平面展布;脱玻化及溶蚀作用对凝灰岩储集性能的改善至关重要。马朗凹陷北斜坡的火山洼地是凝灰岩致密储层发育的有利场所,L1西、L104H东及M7西南等区块是下一步开展致密油勘探的有利目标区。
[Abstract]:Tight tuff reservoir of Tianhu formation in Malang sag is one of the key exploration fields in Santanghu basin in recent years. It is important to make clear the reservoir characteristics and formation conditions for deepening the exploration of dense tuff oil in Santanghu basin. On the basis of thin slice identification and whole rock mineral analysis, combined with field emission scanning electron microscope and capillary pressure curve, the study of reservoir microscopic characteristics was carried out. At the same time, well shock combined method was adopted to utilize amplitude, The frequency attributes predict the distribution of dense tuff reservoirs in Tianhu formation, Malang Sag. The results show that the dense reservoir of tuff in Tianhu formation in Malang Sag is mainly composed of crystal chips and vitreous debris, and is rich in organic matter, developed in devitalized pores, with medium porosity and extremely low permeability. The characteristics of high oil saturation, the relatively stable shallow lacustry-semi-deep lacustrine environment lacking of continental clastic material supply are the key to the formation of dense tuff reservoir. The volcanic depressions within a certain range of distance from volcanic mechanism control the plane distribution of effective dense tuff reservoirs. Devitrification and dissolution are very important to improve the reservoir performance of tuff. The volcanic depressions on the northern slope of Malang Sag are favorable places for the development of dense reservoir of tuff, such as L104H east and southwest of M7 are the next steps to develop dense tuff reservoir. A favorable target area for oil exploration.
【作者单位】：中国石油吐哈油田分公司勘探开发研究院;中国石油西部钻探工程公司吐哈钻井公司;
【基金】：“十三五”国家重大科技专项“重点盆地致密油资源潜力、甜点区预测与关键技术应用”(编号:2016ZX05046-006) “岩性地层油气藏区带、圈闭有效性评价预测技术”(编号:2016ZX05001003-006)联合资助
【分类号】：P618.13

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