北部湾盆地乌石凹陷东区古近系流沙港组二段砂泥薄互层沉积相特征及演化

发布时间：2018-04-01 09:19

本文选题：北部湾盆地　切入点：乌石凹陷东区　出处：《古地理学报》2017年06期

【摘要】：北部湾盆地乌石凹陷东区古近系流沙港组二段构造复杂,沉积差异大,横向变化快,对物源和沉积相的认识存在争议。为了查明研究区沉积相分布与演化规律,文中以岩心、测井、地震和分析化验资料为基础,结合区域构造背景,对研究区流沙港组二段沉积物源、沉积相特征及演化规律展开研究。分析认为,流沙港组二段物源来自于北部高地势地区,发育三角洲前缘—深水湖泊沉积序列,主要发育相对远物源的正常三角洲前缘沉积,砂体单层厚度小、多层交互式分布。井震结合由下到上将流沙港组二段划分为4个四级层序,其中MSC2和MSC3层序为短期快速水退到较长期水进过程,物源供给较为充足,砂体发育程度高,是主力砂体展布层段;流沙港组二段储集层物性主要受埋深及沉积相带约束,B油田物性好于A油田,三角洲前缘近源端发育的水下分流河道、河口坝为有利储集层分布区。
[Abstract]:The second member of the Upper Paleogene Liushagang formation in the eastern part of Wushi Sag in Beibu Bay Basin is characterized by complex structure, large sedimentary difference and rapid lateral variation. There is controversy on the understanding of provenance and sedimentary facies.In order to find out the distribution and evolution of sedimentary facies in the study area, based on the core, logging, seismic and analytical laboratory data, combined with the regional tectonic background, the sediment source of the second member of the Gushagang formation in the study area is studied.The characteristics and evolution of sedimentary facies were studied.It is considered that the source of the second member of the Gushagang formation comes from the northern high-lying area and develops a delta front-deep-water lake sedimentary sequence, mainly a relatively distant source of normal delta front deposition, a small single layer thickness of the sand body, and a multi-layer interactive distribution.The second member of the Liushagang formation is divided into four four-class sequences by combining well and earthquake, in which the MSC2 and MSC3 sequences are short term rapid water retreating to a longer period of water entry process, the material supply is more adequate, and the sand body is developed to a high degree, which is the main sand body distribution section.
【作者单位】：中国地质大学(北京)能源学院;海相储层演化与油气富集机理教育部重点实验室;中海石油(中国)有限公司湛江分公司;国土资源部广州海洋地质调查局;
【基金】：国家科技重大专项(2016ZX05024-002-002)资助~~
【分类号】：P618.13

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