石油实验地质2017，Vol.39Issue(5)：633-639,7.DOI:10.11781/sysydz201705633
北部湾盆地涠西南凹陷富砾型和富砂型湖底扇沉积特征差异分析
Differences of sedimentary characteristics of sublacustrine fans between conglomerate?rich and sand?rich types in the Weixinan Sag, Beibu Gulf Basin
摘要
Abstract
Large oil and gas resources have been found in sublacustrine fans of the 1st member of Liushagang Formation in the Weixinan Sag, Beibu Gulf Basin. The sublacustrine fans in the study area were divided into conglomerate?rich and sand?rich types through the analyses of assay, core, logging and seismic data in order to clarify the reasons for different development effects of sublacustrine fans in different fields. The main reasons for different sedimentary characteristics include ancient landforms and provenance supply. Two kinds of sedimentary models of sublacustrine fans were summarized. Gravity slumping was the main trigger mechanism for sand?rich sublacustrine fans while tectonic movement was the main trigger mechanism for conglomerate?rich sublacustrine fans. Both had a good source-reservoir-caprock assemblage. However, due to poor physical properties, the favorable exploration direction for conglomerate?rich sublacustrine fans was to find secondary porosity develop?ment zones. Sand?rich sublacustrine fans were suitable to host effective traps due to better physical properties.关键词
沉积特征/湖底扇/流沙港组/涠西南凹陷/北部湾盆地Key words
sedimentary characteristics/sublacustrine fan/Liushagang Formation/Weixinan Sag/Beibu Gulf Basin分类
能源科技引用本文复制引用
张辉,曾小明,黄冬梅,陈晓武,莫冯阳,吴碧波..北部湾盆地涠西南凹陷富砾型和富砂型湖底扇沉积特征差异分析[J].石油实验地质,2017,39(5):633-639,7.基金项目
国家重大科技专项"南海西部海域低渗油藏勘探开发关键技术"(2016ZX05024-006)资助. （2016ZX05024-006）
