源内残留沥青原位裂解生气对有机质生烃的影响

doi:10.7623/syxb2013S1006

石油学报 ›› 2013, Vol. 34 ›› Issue (增刊一): 57-64.DOI: 10.7623/syxb2013S1006

源内残留沥青原位裂解生气对有机质生烃的影响

何坤¹, 张水昌¹, 王晓梅¹, 米敬奎¹, 毛榕^1,2, 胡国艺¹

1. 中国石油勘探开发研究院提高石油采收率国家重点实验室北京 100083;
2. 长江大学地球化学系荆州 434023

收稿日期:2003-03-18 修回日期:2013-07-16 出版日期:2013-09-25 发布日期:2013-09-15
通讯作者: 何坤
作者简介:何坤,男,1982年6月生,2005年获南京大学地球化学专业学士学位,2011年获中国石油勘探开发研究院地球探测与信息技术专业博士学位,现为中国石油勘探开发研究院工程师,主要从事油气地球化学及生烃模拟实验研究工作。Email:hekun1@petrochina.com.cn
基金资助:
国家重大科技专项(2011ZX05007)资助

Effect of gas generation from in-situ cracking of residual bitumen in source on hydrocarbon generation from organic matter

HE Kun¹, ZHANG Shuichang¹, WANG Xiaomei¹, MI Jingkui¹, MAO Rong^1,2, HU Guoyi¹

1. PetroChina Research Institute of Exploration and Development , State key Laboratory of Enhanced Oil Recovery, Beijing 100083, China;
2. Department of Geochemistry, Yangtze University, Jingzhou 434023, China

Received:2003-03-18 Revised:2013-07-16 Online:2013-09-25 Published:2013-09-15

摘要/Abstract

摘要：

利用金管模拟装置进行了一系列全岩升温热解实验,探讨了源内残留沥青的原位裂解生气行为及其对源岩生烃的影响。矿山梁地区泥岩和抽提样品升温热解结果表明,残留沥青对源岩生油和生气具有重要贡献,其裂解生气量可达源岩总生气量的32.3%。动力学计算表明,源内残留沥青原位裂解生气平均活化能为234.1 kJ/mol,要明显低于油藏中正常原油的裂解。矿山梁地区泥岩生成烃类气体的最大产率为28.5 mg/g,要明显高于抽提样品,且前者的活化能相对较高。基于实验结果和地质推演可发现,源内残留沥青原位裂解的门限温度仅为140℃,比排出(源外)原油的裂解低30℃左右。此外,麻柳桥地区泥岩及抽提样品的全岩热解表明,残留沥青是高成熟源岩的主要气源。

关键词: II型源岩, 残留沥青, 金管热解, 原位裂解, 活化能

Abstract:

The gas generation behavior of residual bitumen in source rocks (in-source) by in-situ cracking and its effect on hydrocarbon generation from source rocks are examined through non-isothermal pyrolysis of whole rocks in a gold-tube simulation device. Results of the analysis using mudstone and sample extract from Kuangshanliang area show that residual bitumen in-source makes a significant contribution to oil and gas generation, and the yield of bitumen-cracked gas accounts for up to 32.3% of total gas yield from source rocks. The kinetics calculations indicate that the average activation energy for in-situ cracking of residual bitumen in-source is 234.1 kJ/mol, apparently lower than that for normal oil cracking in reservoirs. The maximum yield of hydrocarbon gases from Kuangshanliang mudstone is approximately 28.5 mg/g, substantially higher than that of the sample extract. Likewise, the activation energy for gas generation from Kuangshanliang mudstone is slightly higher than for the sample extract. Through a combination of experimental analysis, kinetics calculation and geological extrapolation, the threshold temperature for in-situ cracking of residual bitumen in-source is 140℃ only, approximately 30℃ lower than that for cracking the oil expelled (out-source). Additionally, results of whole rock pyrolysis with mudstone and sample extract from Maliuqiao area demonstrate that residual bitumen is the primary source of gas generation from source rocks of high maturity.

Key words: Type II source rock, residual bitumen, gold-tube pyrolysis, in-situ cracking, activation energy

中图分类号:

TE135.6

何坤, 张水昌, 王晓梅, 米敬奎, 毛榕, 胡国艺. 源内残留沥青原位裂解生气对有机质生烃的影响[J]. 石油学报, 2013, 34(增刊一): 57-64.

HE Kun, ZHANG Shuichang, WANG Xiaomei, MI Jingkui, MAO Rong, HU Guoyi. Effect of gas generation from in-situ cracking of residual bitumen in source on hydrocarbon generation from organic matter[J]. Editorial office of ACTA PETROLEI SINICA, 2013, 34(增刊一): 57-64.

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源内残留沥青原位裂解生气对有机质生烃的影响

Effect of gas generation from in-situ cracking of residual bitumen in source on hydrocarbon generation from organic matter

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