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福山凹陷是北部湾盆地的重要含油气单元,是一个“小而肥”的富生烃凹陷.充分利用烃源岩和原油的有机地球化学等分析测试数据,针对凹陷内研究较少的西部地区的原油进行地化特征分析,进而研究该区油气藏的油源.研究结果显示凹陷西部原油主要为轻质油,族组分以高饱和烃和芳烃含量、低非烃+沥青质含量为特点.凹陷西部的原油生油母质为陆源高等植物和低等水生生物的混合来源,为陆相湖盆混合型母质特征,不同区块不同层段原油的生油母质具有一定的差别.研究区生油母质沉积环境为偏淡水氧化沉积环境的湖沼相,结合原油成熟度,可将研究区原油划分为3类:(1)美台-红光流三上段原油,具有“中等成熟度,低奥利烷含量”特征;(2)永安流一上段原油,具有“高成熟度,高奥利烷含量”特征;(3)朝阳流一上段原油,具有“低成熟度,中等奥利烷含量”特征.进一步油源对比结果显示,美台-红光地区流三段原油来自流三段和流二下段烃源岩,而永安地区的流一段烃源岩为永安地区的原油提供油源.
Fukuyama Sag is an important oil and gas unit in the Beibu Gulf basin and is a small and fertile hydrocarbon-rich depression that takes full advantage of organic geochemistry and other analytical test data of source rock and crude oil. For the less-studied western part of the depression Regional crude oil geochemical characteristics analysis, and then study the reservoir of oil source.The results show that the sag in the western part of the sag is mainly light oil, the components of high saturated hydrocarbons and aromatic content, low non-hydrocarbon + asphaltene content Characteristics The crude oil parent material in the western depression is a mixed source of terrigenous higher plants and lower aquatic organisms, and is a mixed parent material in the continental lacustrine basin, with some differences in the crude parent materials of different layers in different blocks. The parental sedimentary environment is the lacustrine facies in the oxidation-sedimentary environment with partial dilution of water. According to the maturity of crude oil, the crude oil in the study area can be divided into three categories: (1) (2) Yongan flow in the upper section of the crude oil, with “high maturity, high aurellite content” feature; (3) Chaoyang flow of a section of crude oil, with “low maturity, moderate Austrian Leane content ”features. Further oil source The results show ratio, USTaiwan - red area from the stream of crude oil flows three sections of three sections and two lower stream source rocks, and the flow source rock Wing area Wing crude oil source to provide areas.