冷水碳酸盐岩研究现状与展望
发布时间:2018-03-07 03:15
本文选题:冷水碳酸盐岩 切入点:地质特征 出处:《海相油气地质》2017年01期 论文类型:期刊论文
【摘要】:长期以来,海相碳酸盐沉积物被广泛认为是温暖浅海沉积环境中的产物,然而近年来国外研究表明,在冷水陆架环境中,也可以形成规模的碳酸盐沉积,即冷水碳酸盐岩。通过对大量文献的调研,综述了冷水碳酸盐岩的概念、地质特征、沉积模式等方面的研究进展,并展望了该研究领域未来的发展方向。研究表明,冷水碳酸盐沉积是指在(古)纬度约30°~35°以上的温带及寒带地区、温度约20℃以下的沉积水体中,或是在富营养的寒冷上升流水体中形成的碳酸盐沉积物或岩石,其沉积特征与暖水碳酸盐岩不同。冷水碳酸盐沉积物中的生物颗粒组合以底栖有孔虫、软体动物、苔藓虫等异养生物和钙质红藻为主,缺乏造礁珊瑚和钙质绿藻以及鲕粒、集合颗粒等非骨架颗粒,而且沉积物中灰泥基质含量较少,矿物成分以方解石为主,氧同位素较重,胶结作用弱,以破坏性成岩作用为主。冷水碳酸盐沉积形态以缓坡为主,波浪磨蚀和再沉积作用较强。古代冷水碳酸盐岩的沉积特征、识别标志及其作为储层的油气资源潜力尚处于探索阶段,仍需进一步深入研究。
[Abstract]:For a long time, marine carbonate sediments have been widely regarded as products of warm shallow sea sedimentary environment. However, in recent years, foreign studies have shown that carbonate deposits on a large scale can also be formed in cold water shelf environments. In this paper, the concept, geological characteristics and sedimentary model of cold-water carbonate rock are reviewed, and the future development of this research field is prospected. Cold water carbonate deposits refer to carbonate deposits or rocks formed in temperate and cold regions above (paleo) latitudes above 30 掳or 35 掳, in sedimentary water bodies below 20 鈩,
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