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以前人大量研究成果为基础,综合利用钻井、地震等资料,对中国南海曾母盆地构造单元进行了重新划分。结合南海构造演化背景分析,认为曾母盆地新生代经历了渐新世—早中新世断拗期和中中新世—第四纪拗陷期2个构造演化阶段,发育了不同的物源体系和沉积相带,具有不同的沉积充填特征,断拗期形成煤系和陆源海相2类主力烃源岩,拗陷期形成中—上中新统生物礁主力储层与上新统—第四系区域泥岩盖层。曾母盆地油气分布在平面上呈南油北气的特征,垂向上主要分布于中—上中新统;发育生物礁和构造2种油气藏类型,具有下生上储型和自生自储型2种成藏模式。曾母盆地西北部的康西凹陷中北部,特别是深水区,是下步油气勘探的有利区。
Based on a large number of previous research results, the authors made a comprehensive reorganization of the structural units of the Zengmu Basin in the South China Sea based on comprehensive data of drilling and earthquakes. Based on the background of the tectonic evolution of the South China Sea, the Cenozoic in the Zengmu Basin experienced two stages of tectonic evolution from Oligocene to Early Miocene and Middle Miocene to Quaternary, and developed different provenances System and sedimentary facies, with different sedimentary filling characteristics. Two main types of source rocks of coal measures and terrigenous marine facies are formed in the fault depression period, and the main reservoirs of the Middle-Upper Miocene bio-reef and the Pliocene- Quaternary mudstone caprock. The Zumu Basin oil and gas distribution is characterized by Nanyou north gas in the plane and mainly distributed in the middle and upper Miocene in the vertical direction. There are two types of reservoirs that are reef-reefs and structures, 2 kinds of accumulation mode. The north-central part of the Kangxi Sag in the northwestern Zengmu Basin, especially the deep-water area, is the favorable area for further exploration of oil and gas.