塔中地区深层寒武系盐下白云岩储层特征及主控因素

发布时间：2018-06-27 01:57

本文选题：储层特征 + 盐下白云岩　；参考：《石油与天然气地质》2017年03期

【摘要】：塔中地区东部深层寒武系盐下白云岩勘探取得重大发现,但针对该层系白云岩储层的研究尚属空白。利用钻井、岩心、薄片、扫描电镜、测井及三维地震资料,对塔中寒武系盐下白云岩产层的储层类型、特征、主控因素及展布规律开展探索性研究,认为塔中寒武系盐下白云岩主要发育颗粒滩相白云岩储层和潮坪相膏云岩储层。颗粒滩相白云岩储层主要发育在下寒武统肖尔布拉克组以及中寒武统沙依里克组上段,岩性以台内藻砂屑滩相颗粒白云岩、藻白云岩及粉细晶白云岩为主,明显受岩相控制,形成于准同生期,并受后期层间岩溶作用改造优化。潮坪相膏云岩储层主要发育在中寒武统阿瓦塔格组及沙依里克组下段,岩性以含膏云岩、泥粉晶云岩、膏云质角砾岩为主,明显受岩相及裂缝控制,形成于准同生期,并受后期有机酸溶蚀作用形成微孔型储层。目前而言,下寒武统肖尔布拉克组台内藻砂屑滩相颗粒白云岩储层是最现实的勘探领域。
[Abstract]:Great discoveries have been made in the exploration of deep Cambrian subsalt dolomite in the eastern part of Tarim Basin, but the study of dolomite reservoir in this series is still blank. Based on drilling, core, thin slice, scanning electron microscope, well logging and 3D seismic data, the reservoir types, characteristics, main control factors and distribution of dolomite layers under salt in the central Precambrian are studied. It is considered that the dolomite reservoirs of granular beach facies and tidal flat facies are mainly developed in the lower salt dolomite of the Cambrian in the central part of Tarim Basin. The reservoir of granular beach facies dolomite is mainly developed in the upper member of the Lower Cambrian Shaobulak formation and the Middle Cambrian Shairik formation. The lithology of the reservoir is dominated by the granular dolomite, algal dolomite and fine-grained dolomite in the platform, which is obviously controlled by lithofacies. It was formed in the quasi-syngenic stage and was optimized by interlayer karstification in the late stage. Chaoping gypsum reservoir is mainly developed in the lower member of Awa tag formation and Shailik formation of the Middle Cambrian. The lithology is mainly composed of gypsum bearing dolomite, argillaceous dolomite and gypsum breccia, which is obviously controlled by lithofacies and fractures and formed in the quasi-syntectic period. The microporous reservoir was formed by the late dissolution of organic acid. At present, it is the most realistic exploration field for the algae-sand beach facies dolomite reservoir in the Lower Cambrian Scholburak formation.
【作者单位】：中国石油杭州地质研究院;中国石油碳酸盐岩储层重点实验室;中国石油塔里木油田分公司;
【基金】：国家科技重大专项(2016ZX05004-002) 中国石油股份公司重大科技专项(2014E-32)
【分类号】：P618.13

【相似文献】