尼日尔三角洲盆地某油田深水海底扇沉积特征

发布时间：2018-03-25 17:38

本文选题：高弯度水道　切入点：朵叶体　出处：《地质科技情报》2017年03期

【摘要】：深水海底扇是深水油气勘探的重要目标,尼日尔三角洲盆地深水区海底扇具备良好的油气成藏条件,深入分析其沉积体系是预测有利储集体发育区带的关键。根据岩心观察、测井解释及地震资料等,对研究区深水海底扇的沉积特征进行了研究。结果表明:重力流沉积是研究区深水海底扇主要沉积物类型,但牵引流沉积也大量存在;研究区主要发育水道和朵叶体2种亚相,空间上可分为限制、半限制及非限制3个沉积区域;高弯度的曲流水道是深水海底扇半限制沉积区域的重要特征,水道的弯度指数分布在1.16~2.85之间,其与水道宽度呈正相关关系;水道向非限制沉积区逐渐演变为席状展布、多层叠置的复杂朵叶体沉积。综合分析表明水道和朵叶体均是有利储层发育的重要位置,古地貌是控制海底扇展布的重要因素。
[Abstract]:Deep-water submarine fan is an important target of deep-water oil and gas exploration. The submarine fan in the deep water area of Niger Delta basin has good oil and gas reservoir forming conditions. It is the key to predict the favorable reservoir development zone to deeply analyze its sedimentary system. The sedimentary characteristics of deep-water seafloor fan in the study area are studied by logging interpretation and seismic data. The results show that gravity flow deposition is the main sediment type of deep-water submarine fan in the study area, but tractive flow deposition is also abundant. In the study area, there are mainly two subfacies, watercourse and flower leaf body, which can be divided into restricted, semi-limited and unconfined sedimentary areas in space, and the meandering channel with high curvature is an important feature of semi-restricted sedimentary area of deep-water seabed fan. The curve index distribution of watercourse is between 1.16 and 2.85, which is positively related to the width of watercourse, and the watercourse gradually evolves into sheet distribution to unconfined sedimentary area. The comprehensive analysis shows that both waterways and flower bodies are important positions for reservoir development and paleogeomorphology is an important factor to control the distribution of seafloor fans.
【作者单位】：西北大学大陆动力学国家重点实验室;中国石油大学(北京)油气资源与探测国家重点实验室;中国地质科学院矿产资源研究所;
【基金】：国家科技重大专项项目(2008ZX05030-005) 国家自然科学基金项目(41630312)
【分类号】：P618.13

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