延安周边地区页岩地球化学特征及页岩油潜力评价  

Geochemical Characteristics and Shale Oil Potential of Shale in the Yan’an Area

作　　者：师良 赵彤彤 查辉 王妍妍 霍萍萍 范柏江[1] SHI Liang;ZHAO Tongtong;ZHA Hui;WANG Yanyan;HUO Pingping;FAN Bojiang(School of Petroleum and Environment Engineering,Yan'an University,Yan'an,Shaanxi 716000,China)

机构地区：[1]延安大学石油工程与环境工程学院,陕西延安716000

出　　处：《现代地质》2021年第4期1043-1053,共11页Geoscience

基　　金：国家自然科学基金项目(41702136);陕西省教育厅科学研究专项项目(19JK0968);延安大学校级项目(YDQ2019-29);大学生创新创业训练计划项目(D2019126)。

摘　　要：延安周边地区长7泥页岩地层中获得工业油流,使得针对该地区的勘探工作开始审视页岩油目标。基于此,开展了系统化的烃源岩品质评价工作以及页岩油气潜力分析工作,以期为深入的页岩油勘探提供参考。研究表明,研究区页岩有机质丰度整体较高,平均总有机碳含量4.05%;有机质类型主体为Ⅰ型、Ⅱ1型及Ⅱ2型;整体进入了生油窗,处于成熟生油的热演化阶段。页岩的物质来源为陆地与湖泊的混合来源,其整体上沉积于弱还原弱氧化环境。三类有机质中,有机质含量越高,则其生烃能力也越强;Ⅰ型有机质的生烃能力最大、Ⅱ1型有机质次之,Ⅱ2型有机质相对最小。Ⅰ型有机质、Ⅱ1型有机质及Ⅱ2型有机质,页岩油含量即总游离烃量分别为10.30 mg/g、8.99 mg/g、8.14 mg/g。页岩油相态以游离态为主,吸附态相对较少。可动用性方面,页岩油的可动用资源集中于Ⅰ型有机质,Ⅱ1型有机质可动用较差,Ⅱ2型有机质可动用性极差。在综合勘探潜力方面,最适于进行页岩油勘探的对象是Ⅰ型有机质,其次为Ⅱ1型有机质。Ⅱ2型有机质基本无页岩油勘探潜力。Industrial oil flow has been obtained in Chang 7 shale Formation in Ansai area,which turns this area into a shale oil target.Based on this,systematic quality evaluation of source rocks and shale oil potential analy sis are carried out to provide reference for future shale oil exploration.The results show high organic matter abundance in the shale(average TOC=4.05%),with the main organic matter types being typeⅠ,typeⅡ1 and typeⅡ2.The Chang 7 shale has entered the oil-generating window and is in the oil-generating thermal stage.The shale has both terrestrial and lacustrine source inputs,and the depositional environment was weakly reduc ing or oxidizing.Among the three organic matter types(higher organic matter would lead to higher hydrocarbon generating capacity),type I has higher hydrocarbon generating capacity than typeⅡ1and typeⅡ2 has the lowest hydrocarbon generating capacity.The shale oil content of typesⅠ,Ⅱ1 andⅡ2 organic matter are 10.30mg/g,8.99 mg/g,and 8.14 mg/g,respectively.In terms of availability,the available shale oil resources are concentrated in typeⅠorganic matter.TypeⅡ1 organic matter is lowly available and typeⅡ2 organic matter is poorly available.In terms of comprehensive exploration potential,the most suitable target is type I organic matter,followed by typeⅡ1,and then by typeⅡ2 organic matter.

关 键 词：鄂尔多斯盆地 长7页岩 地球化学特征 页岩油 

分 类 号：TE135.6[石油与天然气工程—油气勘探]