基于Google Earth软件的密西西比河现代三角洲沉积特征解剖

以密西西比河三角洲为例,应用Google Earth软件等信息技术将密西西比河三角洲解析数字化,提取三角洲的地貌、海拔深度值等参数,结合地质沉积背景及测井曲线资料,详细解剖三角洲各沉积亚相及微相单元特征。研究发现密西西比河三角洲各沉积微相及亚相均比较发育,横向与纵向上连续性较好;密西西比河三角洲是典型的鸟足状三角洲,受河流主控因素影响,三角洲前缘发育特有的支流间湾沉积,河口沙坝发育数量多,席状沙在河口沙坝前端呈舌状凸起。

Anatomy of sedimentary characteristics on the Mississippi River modern delta based on the Google Earth software

As the Mississippi River Delta for example, the author with the help of Google Earth software, put the delta into digital for analysis, and got some parameters such as depth and geomorphology. Combining with the geological sedimentary background and well logging curve, the author analyzed the characteristics of sedimentary subfacies and microfacies units of the delta. The study found that the sedimentary microfacies and subfacies of the Mississippi River delta both developed well, the continuity in transverse and longitudinal was better. The Mississippi River delta is a typical bird foot delta, which mainly influenced by fluvial factor. The deposits between tributary bay only developed on a large scale in the delta front of the bird foot delta, and also developed a lot of mouth bar. The shape of sheet sand in front mouth bar front was ligulate.