北部湾盆地乌石凹陷东区始新统流三段水进型扇三角洲沉积特征

发布时间：2018-05-22 21:04

本文选题：北部湾盆地 + 乌石凹陷东区　；参考：《中国地质》2017年03期

【摘要】：北部湾盆地乌石凹陷东区流沙港组三段岩性相对复杂,沉积差异大,横向变化快,连通性差,深入研究流沙港组三段沉积物源和沉积特征对油气勘探开发具有一定的指导意义。在系统的岩心观察与精细描述基础上,结合测井、地震和分析化验资料,针对研究区流沙港组三段沉积物源、沉积相类型及展布特征展开研究。综合分析认为,流沙港组三段物源来自于北部高地势地区,发育相对近物源的水进型扇三角洲沉积,砂体厚度较大,相带窄,相变快,其中三角洲前缘可进一步划分为水下分流河道、河口坝、席状砂、分流间湾等4种沉积微相;在物源分析、井震约束的基础上,依据井震结合含砂率等值线,同时结合测井平面相、地震反射结构、地震构型信息等,综合绘制研究区沉积微相平面展布图,确定了研究区流沙港组三段"大前缘小平原"的沉积特征,并最终建立了该区扇三角洲沉积模式,为乌石凹陷东区流沙港组三段油气勘探开发和储量计算提供了借鉴。
[Abstract]:The three section of the shisha port formation in the east of Wushi depression, Beibuwan Basin, is relatively complex, with large differences in deposition, fast lateral variation and poor connectivity. It is of certain guiding significance for the deep study of the sediment source and sedimentary characteristics of the three segments of the Liu Sha Gang formation for oil and gas exploration and development. On the basis of the core observation and fine description of the system, the logging, seismic and analysis are combined. The type and distribution characteristics of the sediments in the three section of the Gusha port group in the study area are studied. The comprehensive analysis shows that the three segments of the Liu Sha Gang formation are derived from the northern highland potential area, and the water progressive fan delta deposits are developed relatively near the source. The sand body thickness is larger, the facies belt is narrow, and the phase transition is fast, and the delta front can be entered into one. The step is divided into 4 kinds of sedimentary microfacies: underwater distributary channel, estuarine dam, matting sand, and inter distributary Bay, on the basis of physical source analysis and well seismic constraint, according to well seismic combined with sand content equivalent line, combined with well logging plane phase, seismic reflection structure, seismic configuration information, and so on, the research area is deposited in the study area, and the research area is determined. The sedimentary characteristics of the "big front small plain" in the three section of the gang of Liu Sha Gang, and finally established the fan delta sedimentary model in this area, provide a reference for the exploration and development of oil and gas in the three section of the Liu Sha Gang formation in the east of the Wushi Sag.
【作者单位】：中国地质大学(北京)能源学院;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“十三五”科技重大专项项目(2016ZX05024-002-002)~~
【分类号】：P618.13

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