伦坡拉盆地湖盆咸化的沉积响应特征  

Sedimentary response characteristics of lake salinization in Lunpola Basin

作　　者：娄国泉[1] 刘世丽[2] 

机构地区：[1]中国石化江苏油田分公司物探研究院,江苏南京210049 [2]中国石化江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《复杂油气藏》2017年第4期1-6,共6页Complex Hydrocarbon Reservoirs

摘　　要：运用微量元素、X-衍射、岩石薄片分析和岩心观察描述等方法,开展伦坡拉盆地古近系沉积地球化学特征、岩石矿物特征和沉积相类型、沉积演化、沉积模式研究,分析湖盆咸化的沉积响应特征,研究认为:伦坡拉盆地古近系具有环境封闭、持续蒸发咸化的沉积水介质环境,导致盆地内形成大量的碳酸盐岩,并具有陆源碎屑与碳酸盐组份混合的岩石矿物特征。盆地周围受陆源淡水沉积体系控制,发育近源、延伸距离短、相带变化频繁的扇三角洲沉积;湖盆中央受半咸化-咸化水体的控制,发育湖相泥质岩、云坪、混合坪等弱水动力、细粒相带沉积类型;不同时期咸化程度不同,咸化程度越高,陆源体系对盆内沉积的影响越弱。Using methods such as microelement, X -ray diffraction, rock thin slice analysis and core observation description, etc. , it was carried out studies on Lunpola Basin, which include Paleogene sedimentary geochemical characteristics, mineral rock characteristics and types of sedimentary facies, sedimentary evolution, and sedimentary pattern, analyzing the sedimentary characteristics of salinization of lake. The study showed that Lunpola Basin has a closed sedimentary aqueous media environment with continuously evaporating and salinizating, which led to a lot of carbonate - rock depositions, and the mixed mineral characteristics of the carbonate and clastic rocks. The basin periphery was controlled by fresh water depositional system from land source area, where fan - delta deposits was developed with proximal source, short extension distance and the rapid changing facies. The central part of the lake basin was controlled by semi - salinized and salinized water body, where weak hydrodynamic facies were grown with fine sediments such as mudstone tidal flat, dolomite tidal flat and mixed tidal flat. The degree of salinization of the lake was varied in different periods. The higher salinity of lake water is, the weaker the influence of terrestrial sedimentary system on the deposition in the basin.

关 键 词：湖盆咸化 岩石矿物特征 沉积模式 伦坡拉盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]