共和盆地页岩油气地球化学特征  

Geochemical characteristics of the shale hydrocarbon in Gonghe Basin

作　　者：孟元林[1] 赵紫桐[1] 焦金鹤[1] 乔德武[2] 孟凡晋[1,3] 肖丽华[1] 胡安文[1] 蒋涵森[1] 李世铭[1] 

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]国土资源部油气资源战略研究中心,北京100034 [3]Department of Earth and Atmospheric Sciences,University of Houston,Houston,TX 77204-2024,USA

出　　处：《中国石油大学学报（自然科学版）》2012年第5期32-37,44,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：全国油气资源战略选区调查与评价国家专项(2009GYXQ13);国家自然科学基金项目(40872076)

摘　　要：在共和盆地万秀寺剖面下白垩统50.40 m厚的钙质泥岩和233.03 m厚的粉砂岩中,发现了良好的油气显示,从中采集46块含油钙质泥岩和粉砂岩样品,进行热解、沥青'A'族组成、饱和烃气相色谱、饱和烃色谱-质谱和同位素分析,并进行油源对比研究。结果表明:共和盆地下白垩统钙质泥岩中的油气是生成的油气没有排出并以吸附或游离状态的形式滞留其中所致;粉砂岩中的油气与下白垩统黑色泥岩和钙质泥岩具有亲缘关系,是烃源岩所生成油气就近运移并聚集的结果;无论是钙质泥岩中的烃类还是粉砂岩中的油气均具有成熟原油的特征;共和盆地下白垩统粉砂岩和钙质泥岩的含油气丰度较高,含油气总量分别为0.42和1.44 kg.t-1,具有良好的页岩油气勘探远景。Hydrocarbon seeps were discovered in 50.40 m thick calcareous mudstones and 233.03 m thick sihstones of the Lower Cretaceous in Wanxiusi outcrop, Gonghe Basin. forty-six calcareous mudstone and sihstone samples were collected and the tests including pyrolysis, the group composition of chloroform asphalt ＂ A＂ , the gas chromatogram of saturated hydrocar- bon, the gas chromatography-mass spectrormetry of saturated hydrocarbon and isotope were carried out, and oil-source correla- tion was researched. The results show that the hydrocarbons in the form of absorption and free state in the calcareous mud- stones of the Lower Cretaceous are generated and retained in the calcareous mudstones. And the hydrocarbons in the silt- stones are related to the black mudstones and the calcareous mudstones of the Lower Cretaceous. The hydrocarbons generated by the source rocks migrate into the sihstones and accumulate nearby. The hydrocarbons both in the calcareous mudstones and in the siltstones are mature oil. Gonghe Basin is rich in oil and gas resources in the Lower Cretaceous with total hydrocar- bon content of 0.42 kg . t^-1 in sihstone and total hydrocarbon content of 1.44 kg . t^-1 in calcareous mudstone, which shows a great exploration potential of shale gas and oil in the basin.

关 键 词：地球化学特征 贵德坳陷 页岩油气 非常规油气 共和盆地 

分 类 号：TE132[石油与天然气工程—油气勘探]