中国地质2017，Vol.44Issue(3)：485-498,14.DOI:10.12029/gc20170307
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
Sedimentary characteristics of transgressive fan delta of the 3rd Member of Eocene Liushagang Formation in eastern Wushi sag, Beibuwan Basin
摘要
Abstract
The lithology of the 3rd Member of Liushagang Formation in eastern Wushi sag of Beibuwan Basin is relatively complex, with significant differences in sedimentary characteristics, rapid lateral changes and poor connectivity. The study of sediment sources and sedimentary facies is controversial, and the oil and gas exploration and reserves calculation have long been constrained by sedimentary facies study and its distribution regularity. In this paper, based on the core observation and fine description, combined with the logging, seismic and analytical data, the authors analyzed the sedimentary facies type and distribution characteristics of the 3rd Member of Liushagang Formation. It is concluded that the sediment sources of the 3rd Member of Liushagang Formation were from the high terrain in the north, and the transgressive fan delta was developed in this area, with larger sandbody thickness, narrow sedimentary facies, and fast sedimentary facies changes. The delta front can be further divided into four kinds of sedimentary microfacies, i.e., underwater distributary channel, channel dam, sandy sand, and shunt bay. Based on the sand-containing contours compiled by the combination of well and seismic survey, combined with the logging plane facies, seismic facies and seismic reflection structure, the sedimentary microfacies plane profile of the study area was drawn comprehensively, and the sedimentary characteristics of the 3rd Member of Liushagang Formation in the study area were determined. Finally, the fan delta deposition model in this area was established, which provides reference for oil and gas exploration and development and reserve calculation of the 3rd Member of Liushagang Formation in eastern Wushi sag, Beibuwan Basin.关键词
北部湾盆地/乌石凹陷东区/流沙港组三段/沉积物源/沉积特征Key words
Beibuwan Basin/eastern Wushi sag/the 3rd Member of Liushagang Formation/sediment sources/sedimentary characteristics分类
天文与地球科学引用本文复制引用
孙乐,高明轩,于兴河,李胜利,张辉,何玉林,杨楷乐,乔亚蓉,张文淼,吴子瑾..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[J].中国地质,2017,44(3):485-498,14.基金项目
Supported by National 13th Five-Year Science and Technology Major Projects (No. 2016ZX05024-002-002).国家"十三五"科技重大专项项目(2016ZX05024-002-002). （No. 2016ZX05024-002-002）
