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碳酸盐岩礁滩体系是南海海域重要的油气储层之一.南海西沙岛屿全取心的科学钻井——西科1井,为南海碳酸盐岩礁滩体系的详细研究提供极好的条件.通过西科1井岩心的宏观描述及微观分析,结合高分辨岩心扫描及大量分析测试结果,对碳酸盐岩礁滩体系展开了精细研究.根据识别出的6个暴露面、2个淹没面,将西科1井中中新世以来划分为9个三级层序.其中晚中新世黄流组和第四系乐东组为主要成礁期,以海泛面和暴露面为标志,将礁体归纳为淹没型生长单元和暴露型生长单元两大类,暴露型又进一步细分为硬基底和软基底两类,淹没型可细分为快速淹没和缓慢淹没两类.垂向上形成了极具特色的礁体组合,即慢步礁(或淹没礁)、同步礁(加积礁)、快步礁(暴露礁).研究成果对于南海生物礁生长过程及碳酸盐岩礁滩储层勘探具有重要参考价值.
The carbonate reef system is one of the important oil and gas reservoirs in the South China Sea.The fully coring scientific well Xicuo-1 in the Xisha Island of the South China Sea provides excellent conditions for the detailed study of the carbonate reef system in the South China Sea. Through the macroscopic description and microscopic analysis of the core of Well Xike-1 and the combination of high-resolution core-scanning and extensive analysis of the test results, a detailed study of the carbonate-reef system has been carried out.According to the identified six exposed surfaces, two submerged surfaces, The well of Well Xike 1 is divided into 9 third-order sequences, of which, the middle Miocene Huangliu Formation and the Quaternary Ledong Formation are the major reef-forming periods, and are marked by the sea surface and the exposed surface The reefs are classified into two major categories: submerged growth units and exposed growth units. The exposed ones are further subdivided into hard and soft basalts, and submerged subdivisions can be subdivided into two types: rapid submergence and slow submergence. The unique combination of reefs, namely, the step reef (or submerged reef), synchronous reef (plus reef), fast step reef (exposed reef) .The research results for the South China Sea reef growth process and reef carbonate reservoir Exploration has important reference value.