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通过露头、新钻井岩芯、薄片、测(录)井及地震资料的综合分析,开展奥陶系碳酸盐岩沉积相研究,识别出5种相、11种亚相和20多种微相类型,建立碳酸盐岩台-棚相间沉积相发育模式。以此为指导,结合地震层位解释及反射特征研究,刻画奥陶纪不同时期沉积相平面展布特征。研究结果表明:早奥陶世麦盖提斜坡南部发育欠补偿陆棚相沉积,东部发育开阔台地高能粒屑滩,西部发育中低能藻丘沉积。晚奥陶世早期盆地南部台缘斜坡带应沿玛4井—玉北7井一线向南延伸,且为无镶边缓斜坡沉积。
Through the comprehensive analysis of outcrops, new drilling cores, thin slices, logging (logging) wells and seismic data, the Ordovician carbonate sedimentary facies research was carried out to identify five facies, eleven subtypes and more than twenty kinds of microfacies Type, the establishment of carbonate platform - shed facies sedimentary facies development model. Based on this, combined with the study of seismic horizon interpretation and reflection characteristics, the distribution characteristics of sedimentary facies plane in different periods of Ordovician are described. The results show that the Lower Ordovician Maititi slope underdeveloped underdeveloped continental shelf facies, the east developed open platform high-energy debris beach, and the western developed low-energy algal clinker deposits. The marginal slope of the southern margin of the Late Ordovician basin should extend southward along the first line of Well Ma 4 -Yu Bei 7 and have no ramp-edged ramp.