广西崇左柳桥地区上二叠统礁灰岩中沥青的地球化学特征  

Geochemical characteristics of bitumen in the Upper Permian reef limestone in Liuqiao(Chongzuo)area,Guangxi province

作　　者：邱振[1,2] 王清晨[2] 贾望鲁[3] 韦恒叶[4] 彭平安[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京100029 [3]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640 [4]东华理工大学地球科学学院,江西南昌330013

出　　处：《石油与天然气地质》2012年第6期836-844,共9页Oil & Gas Geology

基　　金：国家科技重大专项(2011ZX05008;2011ZX05001)

摘　　要：广西崇左柳桥地区上二叠统生物礁灰岩中普遍发育沥青,沥青主要充填于生物礁内的溶蚀孔洞和裂隙中,其次在生物体腔内。研究区内上二叠统沥青的成熟度较高,H/C原子比一般小于0.1。对崇左柳桥地区上二叠统生物礁灰岩中的沥青和大隆组的硅质岩、硅质泥岩等进行饱和烃色谱-质谱分析,综合对比其所含直链烷烃、萜烷、藿烷、甾烷和生物标志物。结果表明,这些上二叠统沥青源自大隆组的可能性不大,但可能来源于泥盆系烃源岩。Bitumen are well developed in the Upper Permian reef limestone in Liuqiao area,Chongzuo,Guangxi province,and they mainly occur in the cavities and fractures of bioherms,followed by biological coelomata.The bitumen samples show a high maturity and an atomic ratio of H/C generally less than 0.1.Based on the gas chromatography-mass spectrometry analyses of saturated hydrocarbon extracted from the bitumen in the Upper Permian as well as from the silicite and and siliceous mudstones in the Dalong Formation in the Liuqiao（Chongzuo）area,we correlated their n-alkane,terpane,hopane,sterane and biomarkers.The result shows that the possibility of the bitumen being sourced from the Dalong Formation of the Upper Permian is slime.Instead,it could come from the source rocks of the Devonian in the study area.

关 键 词：地球化学 沥青 上二叠统 生物礁灰岩 大隆组 柳桥地区 广西 

分 类 号：TE122.1[石油与天然气工程—油气勘探]