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普光气田沥青地球化学特征及成因
蔡勋育 朱扬明 黄仁春
摘 要:系统的地球化学分析表明,普光气田飞仙关和长兴组气藏沥青为古油藏原油经热裂解成气的残留物.其有机元素组成以贫氢、富氧、富硫为特征,属高热演化且受硫酸盐热化学还原作用影响的焦沥青类.它们的碳同位素变化在-25.60‰~-27.78‰之间,与本区上二叠统烃源岩干酪根相当(-26.50‰~-29.20‰),两者具有成因关系.这些沥青的饱和烃中正烷烃系列碳数分布完整,没有遭受过严重生物降解作用的迹象.它们呈植烷优势,Pr/Ph值小于1.0;甾烷系列中C27化合物占优势,检出C30和C26甾烷;萜烷中三环萜烷丰富,伽马蜡烷含量较高.这表明有机质来源以水生生物为主,是在还原环境中沉积的海相烃源层.沥青的芳烃组成独特,富含四、五环芳烃化合物,且以萤蒽、芘、(艹屈)和苯并萤蒽等无烷基取代的母体芳烃化合物为主,反映出沥青裂解成气过程中的有机质芳构化作用.芳烃分布模式及甲基菲指数显示,这些沥青已达高演化阶段,相当的镜质体反射率在2.0以上.
关键词:有机元素;碳同位素;生物标志物;芳烃;沥青;普光气田;四川盆地
分类号:TE125.2 文献标识码:A
文章编号:0253-9985(2006)03-0340-08
Geochemical behaviors and origin of reservoir bitumen in Puguang gas pool
Cai Xunyu Zhu Yangming Huang Renchun
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基金项目:国家重点基础研究发展规划(973)项目(2005CB422100)
作者简介:蔡勋育(1963-),男(汉族),教授级高级工程师、博士,油气勘探及研究
作者单位:蔡勋育(中国石油化工股份有限公司,南方勘探开发分公司,勘探开发研究院,云南,昆明,650200)
朱扬明(浙江大学,地球科学系,浙江,杭州,310027)
黄仁春(中国石油化工股份有限公司,南方勘探开发分公司,勘探开发研究院,云南,昆明,650200)
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