岩性油气藏 ›› 2023, Vol. 35 ›› Issue (1): 4962.doi: 10.12108/yxyqc.20230105
邓美玲1,2, 王宁1,2, 李新琦3, 陈容涛3, 刘岩1,2, 徐耀辉1,2
DENG Meiling1,2, WANG Ning1,2, LI Xinqi3, CHEN Rongtao3, LIU Yan1,2, XU Yaohui1,2
摘要: 通过对渤海海域莱州湾凹陷中部古近系沙三段烃源岩样品的热解、TOC、饱和烃GC/MS分析以及主、微量元素分析,研究了其烃源岩的地球化学特征及沉积环境。研究结果表明: ①莱州湾凹陷中部古近系沙三段烃源岩有机质丰度差异较大,总体为好-优质烃源岩,有机质类型以Ⅰ-Ⅱ型为主,整体处于低熟-成熟阶段;②通过Pr/nC17-Ph/nC18图版、C24四环萜烷/C26三环萜烷 (C24TeT/C26TT) 、C27/C29规则甾烷、奥利烷指数等参数判断沙三段烃源岩有机质来源为低等水生生物和高等植物的混源输入;③综合CIA,Sr/Ba,Pr/Ph,V (/V+Ni),U/Th值和伽马蜡烷指数等分析了烃源岩形成时期的古环境,认为沙三段沉积时期气候温暖湿润,降水丰富,水体为淡水-微咸水,陆源输入较多,具有较高的初始生产力,沉积时期整体表现为贫氧的弱氧化弱还原环境,沙三下段-沙三上段沉积环境整体变化不大,古气候和古水体盐度基本保持不变,但陆源输入及水体氧化条件随沉积进程呈逐渐增加的趋势。
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