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北部湾盆地在中始新世至早渐新世是一个湖泊。该湖泊水体宁静,古气候温暖、湿润,水介质为半咸水—咸水,对有机质的生成、堆积、埋藏和保存十分有利。本文通过对原油含蜡量、含硫量、钒镍比和异戊间二烯烷烃等有机地球化学指标的分析,认为该盆地油气生成的地质环境为陆相环境,并通过油源对比,确认该盆地上第三系中新统角尾组、古生界石灰岩和下第三系始新统一下渐新统流沙港组所产的原油,均来自流沙港组母岩。
The Beibu Gulf Basin is a lake from Middle Eocene to Early Oligocene. The lake has a quiet water body and a warm pale ancient climate. The water medium is brackish-brackish water, which is very favorable for the formation, accumulation, burial and preservation of organic matter. Based on the analysis of organic geochemical indicators including wax content, sulfur content, vanadium-nickel ratio and isoprenoid, the geological environment of oil and gas generation in this basin is terrestrial environment, and through the comparison of oil sources, The Upper Triassic Miocene Kokao Formation in the basin, Paleozoic limestone and the Lower Miocene Eocene Oligocene Liushagang Formation are all derived from the parent rocks of the Liushaogang Formation.