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天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

陆相页岩气组分与碳同位素特征——对页岩气产量预测的启示

陈斐然1,2，姜呈馥3，史鹏3，陈践发2，孙建博3，董劲2，冯德军2，成华勇2   

  1. 1.中国石油勘探开发研究院,北京 100083;
    2.中国石油大学(北京)油气资源与探测国家重点实验室，北京 102249;
    3.延长石油集团有限责任公司，陕西 西安 710075
  • 收稿日期:2015-07-03 修回日期:2016-01-15 出版日期:2016-06-10 发布日期:2016-06-10
  • 通讯作者: 陈践发(1962-)，男，湖南耒阳人，教授，博士生导师，主要从事石油天然气地质及地球化学研究. E-mail:jfchen@cup.edu.cn.
  • 作者简介:陈斐然(1988-)，男，湖南新宁人，博士研究生，主要从事油气藏形成分布与勘探研究. E-mail:feiran_c@163.com.
  • 基金资助:
    陕西延长石油(集团)科技重大专项(编号：陕研13-4)资助.

Gas composition and carbon isotopic fractionation characteristics of terrestrial Ordos shale gas:Implications for prediction of shale gas production over time

Chen Fei-ran1,2，Jiang Cheng-fu3，Shi Peng3，Chen Jian-fa2，Sun Jian-bo3，Dong Jin2，Feng De-jun2，Cheng Hua-yong2   

  1. 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
    3.Yanchang Petroleum (Group) Co.Ltd.,Xi’an 710075,China
  • Received:2015-07-03 Revised:2016-01-15 Online:2016-06-10 Published:2016-06-10

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摘要： 为探究鄂尔多斯盆地延长组陆相页岩气体组分与碳同位素特征，初步建立研究区页岩气产量预测模型，动态监测页岩气产能，有效指导页岩气合理开发。通过采集现场岩心解吸气体及生产井气体样品进行相关实验分析，实验结果表明:研究区气体甲烷含量相对较低，干燥系数(C1/C1-5)主要分布在0.6～0.8之间,碳同位素值相对偏负。受页岩气解吸及生产过程中气体吸附/扩散作用影响，样品干燥系数及碳同位素值随现场解吸或单井投产时间增加分馏效应明显，主要表现为重烃(C2+)组分含量增加及碳同位素值增高。气体干燥系数与单位质量页岩解吸气量相关性相对较好(R2>0.8)。根据干燥系数与生产气量对数关系可初步建立预测模型，推测单井有效生产时间，对预测单井产量及动态监测页岩气产能具有重要意义。

关键词: 陆相页岩, 组分, 碳同位素, 产量预测模型

Abstract: In order to study the variation on shale gas composition and carbon isotopic fractionation characteristics of terrestrial shale in Ordos Basin,and ultimately establish a prediction model for shale gas production to monitor shale gas production capacity and effectively manage the development of shale gas,some core samples from production wells were obtained for desorption analyses of its gas composition and carbon isotope.The desorption results showed that methane content of the desorbed gas is relatively low,the drying coefficient (C1/C1-5) ranges from 0.6 to 0.8,and the carbon isotope is relatively negative.With the increasing desorption and production time,the drying coefficient and carbon isotope values of such desorpted samples show obvious carbon fractionation during gas adsorption/diffusion processes.The changes are mainly with increasing of heavy hydrocarbons (C2+)and heavier carbon isotope values.The drying coefficient show good correlation (R2> 0.8) with the content of shale gas desorption per unit mass.A gas production prediction model was proposed to predict gas production over the life of production well based on the relationship between the drying coefficients and gas production volume in the Ordos Basin.

Key words: Terrestrial shale, Gas component, Carbon isotope, Gas production prediction model

中图分类号: 

  • TE122.2+3

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