合肥盆地南缘油气来源的地球化学示踪  

Geochemical tracing for oil-gas sources from southern margin of Hefei basin

作　　者：徐春华[1,2] 彭平安[3] 刘大勇[3] 

机构地区：[1]北京大学地球与空间科学学院 [2]中国石化胜利油田分公司勘探项目管理部 [3]中国科学院广州地球化学研究所

出　　处：《合肥工业大学学报（自然科学版）》2010年第5期735-740,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家重点基础研究发展计划(973计划)资助项目(G1999043308)

摘　　要：合肥盆地已经发现了多套烃源岩,但有效烃源岩的发育层位仍是合肥盆地未解决的重要问题。文章根据所发现沥青的常规地球化学分析,结合地质研究,推断出可能的烃源岩发育层位是下侏罗统防虎山组或下白垩统黑石渡组;利用沥青和可能源岩抽提物饱和烃及芳烃的分子地球化学对比,确定了下白垩统黑石渡组泥岩是霍山沥青的母源,解决了长期以来合肥盆地是否存在有效烃源岩的问题,证实了下白垩统黑石渡组是合肥盆地的烃源岩,为下一步油气勘探提供了依据。Multiple sets of source rocks have been found in the Hefei basin,but detailed stratigraphic level of the effective source rocks turns into a problem.Firstly,on the basis of routine geochemical analysis of the bitumen as well as geological researches,it is deduced that the Fanghushan Formation of lower Jurassic and Heishidu Formation of lower Cretaceous are potential source beds.Then,with comparing the molecule geochemical characteristics of saturated hydrocarbon and aromatic hydrocarbon respectively extracted from bitumen and potential source rocks,it is confirmed that mudstone of the Heishidu Formation is the source of bitumen found at Huoshan area.This paper not only resolves the issue whether or not effective source rocks exist in the Hefei basin which has puzzled many researchers for a long time,but also proves that mudstone of the Heishidu Formation is the effective source rocks of the Hefei basin.The conclusion provides an important basis for further oil and gas exploration.

关 键 词：固体沥青 烃源岩 分子地球化学 油源对比 霍山地区 合肥盆地 

分 类 号：P618.130.1[天文地球—矿床学]