林西县官地剖面林西组烃源岩生物标志化合物特征  

The Characteristics of Biomarker Compounds of Source Rocks in Linxi Formation in Guandi Section of Linxi County in the East of Inner Mongolia

作　　者：孙鹏[1] 唐友军[1] 张永生[2] 彭渊[2] 

机构地区：[1]长江大学资源与环境学院,湖北武汉430100 [2]中国地质科学院矿产资源研究所,北京100037

出　　处：《长江大学学报（自科版）（中旬）》2016年第11期1-6,共6页Journal of Yangtze University(Nature Science Edition)

基　　金：国家自然科学基金项目(41572098)

摘　　要：林西组（P3l）是松辽盆地外围勘探的重要层位,以林西县官地剖面样品为研究对象,对其有机质生源构成、沉积环境、成熟度进行了探讨。P3l烃源岩饱和烃气相色谱呈现出单峰型、前峰态,其主峰碳为C23,表明烃源岩有机质来源主要为混合有机质;Pr/Ph（姥鲛烷/植烷）介于0.04-0.26,呈现出植烷优势,指示强还原的沉积环境;P3l烃源岩以C23三环萜烷作为主峰,三环萜烷含量丰富,藿烷/甾烷介于0.6-1.0（平均0.84）,揭示细菌和藻类对有机质的贡献呈现出均势;检测到了一定含量的伽马蜡烷,其值介于0.12-0.16（平均0.14）,说明应为微咸水-半咸水环境;甾烷系列中以C27甾烷分布占优势为特征,C27甾烷/C29甾烷为1.13,说明烃源岩母质的生源构成以低等水生生物藻类来源为主;同时检测到一定含量的甲藻甾烷,说明P3l曾受到过海侵。Linxi Formation was an important position for oil exploration in the periphery of Songliao Basin.Based on gas chromatography and gas chromatography mass spectrometry techniques,the characteristics of biomarker compounds of Linxi hydrocarbon source rocks from Linxiguandi Section in the East of Inner Mongolia were studied,the geological and geochemical significance indicated by sources of organic matter,sedimentary environment,the degree of the thermal evolution of organic matter and some other factors were analyzed.Gas chromatography peaks of saturated hydrocarbons source rocks from Linxi Formation showed'the former peak'of the single peak distribution and the main peak of carbon was composed mainly of C23.This indicates that the main sources of organic matter are mixed organic matter,and Pr/Ph is ranged from 0.04 to 0.26,it presents a strongly reducing sedimentary environment.Molecular fossil assemblages of source rocks in Linxi Formation are abundant in tricyclic terpane with long side chains,it is high level of gammacerane,and the distribution of C27 steranes is dominated.Gammacerane ratio is ranged from 0.12 to 0.16 with an average value of0.14,it reveals that the hydrocarbon source rocks are formed in the environment with micro-saltwater to semi-saltwater.The abundance of C27 steranes is dominated,and the ratio of C27steranes/C29 steranes is 1.13,it show that alga is the main source of hydrocarbon precursor.

关 键 词：官地剖面 林西组 烃源岩 生物标志化合物 

分 类 号：TE122.2[石油与天然气工程—油气勘探]