岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 8192.doi: 10.12108/yxyqc.20210609
• 油气地质 • 上一篇
阳宏1,2, 刘成林1,2, 王飞龙3, 汤国民3, 李国雄1,2, 曾晓祥1,2, 吴育平1,2
YANG Hong1,2, LIU Chenglin1,2, WANG Feilong3, TANG Guomin3, LI Guoxiong1,2, ZENG Xiaoxiang1,2, WU Yuping1,2
摘要: 渤中凹陷发育较厚的东营组泥岩烃源岩,为了明确该套烃源岩特征及发育模式,通过对渤中凹陷东营组烃源岩样品进行有机-无机地球化学实验、全岩-黏土和孢粉分析测试,评价了该套烃源岩品质,并综合Sr/Cu,Mn/Fe等20种元素比值以及Pr/Ph、伽马蜡烷指数、环萜烷比值、碳同位素、低等藻类化石含量和孢粉组合,分析了东营组形成时期的古沉积环境和古生产力,并建立了东营组烃源岩发育模式。结果表明:①东营组泥岩以石英、长石为主,碳酸盐矿物含量较低,而黏土矿物含量较高,质量分数为30%;②东三段与东二段下部有机质丰度高,达到成熟—高成熟阶段,有机质类型均以Ⅱ1—Ⅱ2型为主;③东三段—东一段均为温湿古气候,水体盐度逐渐变淡,水深逐渐变浅,由东三段高水深(70.1 m)变为东一段低水深(26.7 m),陆源侵入和水体氧化条件呈现逐渐增强的趋势,古生产力高低依次为东三段(高)、东二段(中)、东一段(低);④高生产力、还原保存条件主导东营组有机质的富集,而古气候、水深、盐度和陆源输入对有机质的富集产生间接影响。
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