天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

涪陵页岩气田焦石坝地区页岩气地球化学特征及成因

魏祥峰,郭彤楼,刘若冰   

  1. (中国石化勘探分公司,四川 成都 610041)
  • 收稿日期:2015-06-11 修回日期:2015-09-29 出版日期:2016-03-10 发布日期:2016-03-10
  • 作者简介:魏祥峰(1984-),男,山东济宁人,高级工程师,博士,主要从事沉积学、非常规油气地质研究. E-mail:weixiangfeng1984@163.com.
  • 基金资助:

    中国石油化工股份公司科技部项目“四川盆地及周缘区块下组合页岩气形成条件与有利区带评价研究”(编号:P13129)资助.

Geochemical features of shale gas and their genesisin Jiaoshiba block of Fuling Shale Gasfield,Chongqing

Wei Xiang-feng,Guo Tong-Lou,Liu Ruo-bing   

  1. (SINOPEC Exploration Company,Chengdu 610041,China)
  • Received:2015-06-11 Revised:2015-09-29 Online:2016-03-10 Published:2016-03-10

摘要:

以涪陵页岩气田焦石坝地区五峰组—龙马溪组海相天然气为研究对象,通过对页岩气样品组分和碳同位素等方面的分析发现,涪陵页岩气田焦石坝地区天然气为优质烃类气体,甲烷含量介于97.22%~98.41%之间,含有少量的乙烷、丙烷,湿度平均为0.74%,非烃气体中含有少量的CO2、N2和H2等,不含H2S;甲烷、乙烷与丙烷的碳同位素值分布具有δ13C113C213C3的完全 “倒转”特征。涪陵页岩气田五峰组—龙马溪组产出的天然气来自于五峰组—龙马溪组烃源岩自身,为典型的页岩气。同时天然气成因类型判别标志和图版表明,涪陵页岩气田焦石坝地区天然气属于有机高温裂解的油型气,为干酪根裂解气和原油二次裂解气的混合气,具有明显的原油二次裂解气的特征。δ13C113C213C3完全“倒转”的主要因素为原油二次裂解气和干酪根裂解气混合造成的,燕山晚期以来页岩气的散失作用也有一定的影响。

关键词: 页岩气, 碳同位素, 成因与来源, 五峰组&mdash, 龙马溪组, 焦石坝地区, 涪陵页岩气田

Abstract:

Taking natural gas from marine strata of Wufeng-Longmaxi Formations in Jiaoshiba block of Fuling Shale Gasfield as a research object and based on the analyses of gradients of shale gas and carbon isotope,it is found that the natural gas from Jiaoshiba area belongs to high quality hydrocarbon gas.The contents of methane is 97.22%-98.41%,with little amount of ethane and propane,average wetness of 0.74%,little amount of non-hydrocarbons such as CO2,N2 and H2,and no H2S.Carbon isotopes of methane,ethane and propane characterized by complete isotopic reversal,i.e.,δ13C113C213C3.The natural gas from Wufeng-Longmaxi Formtions comes from source rocks of Wufeng-Longmaxi Formations,belonging to typical shale gas.According to the statistical determination criterion,natural gas in the Jiaoshiba area is derived from the sapropelic source rocks,which is a result of high temperature pyrolysis.It is a mixing product of primary kerogen pyrolysis and secondary pyrolysis of crude oil,with obvious features of secondary pyrolysis of oil. The reason for complete carbon isotopic reversal is the mixing of the two above gases.Moreover,it has some relationships with loss function of shale gas after Late Yanshan.

Key words: Shale gas, Gas components, Carbon isotope, Genesis and sources, Wufeng-Longmaxi Formations, Jiaoshiba area, Fuling Shale Gasfield

中图分类号: 

  • TE122.1

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