松辽盆地松科1井烃源岩生物标志化合物特征  

Biomarker characteristics of source rocks in Well SK1in Songliao Basin

作　　者：聂志阳[1,2] 黄清华[2] 席党鹏[1] 万晓樵[1] 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《地学前缘》2014年第2期265-274,共10页Earth Science Frontiers

基　　金：国家重点基础研究发展计划"973"项目(2012CB822002);国家自然科学基金项目(41172037;41302008);中国地质调查局地质调查工作项目(1212011120145)

摘　　要：松科1井是中国大陆第一口以白垩纪陆相地层为研究对象的全取心科学探井。通过取心样品的生物标志化合物组合特征分析,文中探讨了松辽盆地上白垩统烃源岩有机质来源、成熟度及沉积环境等变化特征。生物标志化合物参数表明松辽盆地上白垩统的原始有机母质构成中,既有丰富的藻类、细菌等低等水生生物,又有一定比例的陆上高等植物输入。其中青一段、青二三段和嫩一段具有低的三环萜烷/藿烷值、高的甾烷/藿烷比值以及甾烷C27对C29的相对优势,说明该时期湖泊藻类勃发,初级生产力高。松辽盆地上白垩统沉积环境变化较大,其中青一段、嫩一段烃源岩较低的Pr/Ph值、较高的伽马蜡烷指数和较低的重排甾烷指数指示了咸化条件下的水体分层的缺氧环境。综合分析各项生物标志化合物参数,总结上白垩统各个组段有机质成熟度、沉积环境及有机质来源,认为青一段是最好的优质烃源岩。该时期是藻类勃发、水体分层、高温缺氧、强还原的深湖环境,是有机质保存演化的理想场所。同时,也进一步验证了松辽盆地白垩纪湖泊缺氧事件发生的事实。The Well SK1 is located in the Songliao Basin, which is the first full Cretaceous coring hole in China for scientific research. Through analysis of biomarkers on core samples, the variation of organic matter origin, maturity and depositional environments revealed from the Upper Cretaceous source rocks are discussed. It is indicated that the original composition of organic matter in the Upper Cretaceous originated from algae, bacteria and other lower aquatic organisms and a certain proportion inputs of terrestrial plants. The low tricycIic terpanes/hopanes, high sterane/hopane as well as high steranes C27/C29 during the depositional periods of member 1 of Qingshankou Formation, member 2 and 3 of Qingshankou Formation and member 1 of Nenjiang Formation indicated that the periods were the blooming era of the organic matter. Sedimentary environment changed greatly in the Songliao Basin during the Late Cretaceous The lake was anoxic, saline and stratified during the organic matter accumulated in the member i of Qingshankou Formation and in the member 1 of Nenjiang Formation. This is indicated by a low Pr/Ph, high gammaeerane and low diasterane in the source rocks. The best source rocks existed in the member 1 of the Qinshankou Formation according to comprehensive analysis of biomarkers. Highly reducing （saline） bottom water conditions, stratified water column and highly anoxic conditions existed in the deep lake, where was the ideal place for the evolution and preservation of organic matter. Cretaceous anoxic events were also verified in the Songliao Basin.

关 键 词：松辽盆地 松科1井 白垩纪 烃源岩 生物标志化合物 

分 类 号：P539[天文地球—古生物学与地层学]