原油裂解气与干酪根裂解气差异实验研究

郭利果; 肖贤明; 田辉

doi:10.11781/sysydz201104428

原油裂解气与干酪根裂解气差异实验研究

doi: 10.11781/sysydz201104428

1.
南京大学地球科学与工程学院地球科学系, 南京 210093
2. 中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214151
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, 广州 510640

基金项目: 国家杰出青年基金项目(40625011);中国科学院知识创新项目(KZCX2-YW-114)资助

详细信息

作者简介:
郭利果(1981- ),男,博士后,从事石油地质综合研究.E-mail:ligo2000@163.com.

中图分类号: TE135
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出版历程
- 收稿日期: 2010-12-09
- 修回日期: 2011-06-13
- 刊出日期: 2011-08-28

Laboratory studies of differences between oil-derived and kerogen maturation gases

1.
Department of Geosciences, Geosciences and Engineering Institute, Nanjing University, Nanjing, Jiangsu 210093, China
2. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China
3. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China

摘要

摘要: 对取自渤海湾盆地东营凹陷的一块湖相未成熟I型烃源岩,应用分步裂解生烃、抽提与族组分分离、配分的实验方法,获得了同一母质来源的合成油(S-油)和似干酪根(P-干酪根)样品.应用黄金管限定体系,对2个样品进行生烃热模拟实验,测定2类热解气体的成分与碳同位素值.研究结果表明,2类气体性质明显不同.与P-干酪根相比,S-油裂解气具有以下特点:在裂解早期阶段,C₂-C₅重烃含量高,湿度大;C₁-C₃气体碳同位素轻,两者差值最大可达10‰(C₁),14‰(C₂)和9‰(C₃);(δ¹³C₂-δ¹³C₃)值较大,受成熟度影响大.在实验条件下获得的(δ¹³C₂-δ¹³C₃)-δ¹³C₁和(δ¹³C₂-δ¹³ C₃)-ln(C₂/C₃)图解能有效区分这2类裂解气.本研究成果为地质条件下原油裂解气与干酪根裂解气的判别提供了理论指南.
- 原油裂解气 /
- 干酪根裂解气 /
- 碳同位素分馏 /
- 热模拟实验
Abstract: An immature type-I mudstone collected from the third section of the Tertiary Shahejie Formation (Es₃³) in the Dongying Sag of the Bohai Bay Basin was studied with laboratory experiments.Products were extracted,fractionated into chemical groups,and re-mixed to obtain synthetic oil (s-oil) with a group composition similar to reservoir oil and a pseudo-kerogen (p-kerogen) composed of 83% kerogen and 17% residual soluble organic matter.The two samples were pyrolyzed in sealed gold tubes under constant pressure and non-isothermal heating conditions and the generated gases were analyzed.The two gases are quite different in their chemical and isotopic composition.Compared with the gas derived from p-kerogen,the s-oil-derived gas is rich in C₂-C₅ hydrocarbons during the early cracking stages and C₁-C₃ hydrocarbons are depleted in δ¹³C throughout the cracking stages.The carbon isotopic ratio differences between the two gases can reach 10‰ (δ¹³ C₁),14‰ (δ¹³ C₂),and 9‰ (δ¹³ C₃).The δ¹³C₂-δ¹³C₃ value of the s-oil gas is much more sensitive to thermal stress than that of the p-kerogen gas and the plots of (δ¹³C₂-δ¹³C₃) versus δ¹³ C₁ and (δ¹³C₂-δ¹³C₃) versus ln(C₂/C₃) are effective in identifying the two gas types.These results provide a guide to differentiate gases derived from oil cracking from those derived from kerogen maturation.
- oil-derived gas /
- kerogen-derived gas /
- carbon isotopic fractionation /
- pyrolysis experiment

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参考文献(41)

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