松辽盆地东岭区块烃源岩饱和烃特征及其古环境意义  

Saturated Hydrocarbon Characteristics in Source Rocks and Palaeo-environment Significance in Dongling Block of Songliao Basin

作　　者：朱战军 崔鸣[2] 张志琳[3] 金晓辉[1] 林壬子[4] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中原油田分公司勘探开发研究院,河南濮阳457001 [3]中国地质大学(北京)能源系,北京100083 [4]中国石油大学(北京)资源与信息学院,北京102249

出　　处：《石油天然气学报》2008年第4期16-22,共7页Journal of Oil and Gas Technology

摘　　要：通过对松辽盆地东岭区块营城组、火石岭组和泉头组烃源岩样品抽提物饱和烃GC／MS分析，运用分子有机地球化学方法探讨了该区块饱和烃特征、并确认该区块古沉积环境。分析结果显示，正烷烃碳数分布多为单峰分布，以nC16～nC18为主峰，表明烃源岩样品演化程度较高，G29甾烷20S／（20S＋20R）比值和aBB／（aBB＋aaa）比值呈正相关性，它们的比值一般为0．4左右，属于成熟烃源岩，其中，SN183井2154．78m火石岭组烃源岩样品的成熟度高于其他烃源岩样品。烃源岩Pr／Ph介于0．706～2．179之间，含有相对较高含量伽马蜡烷，规则甾烷普遍具有C29〉C27〉C28的分布特征，反映烃源岩沉积时沉积水体较浅，物源输入以陆源高等植物为主，低等水生生物为辅，而且处在弱氧化-还原条件下、微成-半咸水湖相沉积环境。The paper is aimed to research the character of saturated hydrocarbon and confirm paleosedimentary environment of source rocks, including Yingcheng Formation, Huoshiling Formation and Quantou Formation in Dongling Block of the Songliao Basin. Based on GC/MS analysis data of saturation hydrocarbon of core extracts and methods of molecular organic geochemistry. The results show that the carbon number of n-alkanes is mostly unimodal distribution, and the nC16～nC18 was main peaks, which indicates evolutionary level of hydrocarbon source rocks was upper. The C29 sterane's 20S/(20S+20R) and αββ/(αββ+ααα) showed positive correlation, and 20S/(20S+20R) and αββ/(αββ+ααα) was about 0.4. All these results indicate the source rock organic matter is at mature stage, the hydrocarbon source rocks of Huoshiling formation in 2154.78m of well SN183 is better than other samples. The hydrocarbon source rock's Pr/Ph is in the range of 0.706～2.179. The content of gammacerane is relatively higher. The distribution patterns of sterane are characterized by C29>C27>C28. All facts show that source rocks are formed under shallow water. The organic matter of these source rocks mainly come from terrestrial higher plants with lower contribution from the few aquatic organisms, deposite in the weak oxidation-desoxidation condition and slightly brackish-brackish lacustrine environments.

关 键 词：烃源岩 饱和烃 生物标志物 古沉积环境 东岭区块 

分 类 号：P618.13[天文地球—矿床学]