川西北地区泥盆系天然气沥青地球化学特征及来源示踪

doi:10.7623/syxb201810003

石油学报 ›› 2018, Vol. 39 ›› Issue (10): 1103-1113.DOI: 10.7623/syxb201810003

川西北地区泥盆系天然气沥青地球化学特征及来源示踪

谢增业¹, 张本健², 杨春龙¹, 董才源¹, 裴森奇², 赵洁³, 国建英¹, 张璐¹

1. 中国石油勘探开发研究院中国石油天然气集团有限公司天然气成藏与开发重点实验室河北廊坊 065007;
2. 中国石油西南油气田公司川西北气矿四川江油 621741;
3. 中国科学院大学渗流流体力学研究所河北廊坊 065007

收稿日期:2018-02-22 修回日期:2018-08-20 出版日期:2018-10-25 发布日期:2018-12-05
通讯作者: 谢增业,男,1965年2月生,1986年获广东石油学校石油地质专业学士学位,2003年获中国地质大学(北京)矿产普查与勘探专业博士学位,现为中国石油勘探开发研究院高级工程师,主要从事油气地球化学和油气成藏综合研究。Email:xiezengye69@petrochina.com.cn
作者简介:谢增业,男,1965年2月生,1986年获广东石油学校石油地质专业学士学位,2003年获中国地质大学(北京)矿产普查与勘探专业博士学位,现为中国石油勘探开发研究院高级工程师,主要从事油气地球化学和油气成藏综合研究。Email:xiezengye69@petrochina.com.cn
基金资助:
国家科技重大专项（2016ZX05007-003）和中国石油天然气股份有限公司科技项目（2016B-0602）资助。

Geochemical characteristics and source trace of the Devonian natural gas and bitumen in Northwest Sichuan Basin

Xie Zengye¹, Zhang Benjian², Yang Chunlong¹, Dong Caiyuan¹, Pei Senqi², Zhao Jie³, Guo Jianying¹, Zhang Lu¹

1. PetroChina Research Institute of Petroleum Exploration & Development;CNPC Key Laboratory of Gas Reservoir Formation and Development, Hebei Langfang 065007, China;
2. Northwest Sichuan Gasfield, PetroChina Southwest Oil & Gas Field Company, Sichuan Jiangyou 621741, China;
3. Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Hebei Langfang 065007, China

Received:2018-02-22 Revised:2018-08-20 Online:2018-10-25 Published:2018-12-05

摘要/Abstract

摘要：

四川盆地西北部地区首次在中泥盆统观雾山组白云岩储层中获得工业气流，天然气来源备受关注。应用地球化学分析技术开展了泥盆系天然气、沥青、油砂及烃源岩地球化学特征综合研究。结果表明：泥盆系天然气是以烃类气体为主的二次裂解型干气，甲烷含量>94%，含痕量乙烷、丙烷及少量的氮气、二氧化碳等非烃气体；天然气δ¹³C₁值为-32.3‰~-31.9‰，δ¹³C₂值为-28.6‰~-28.4‰，δ²H₁值为-141‰~-138‰，为以腐泥型为主的混合型气。泥盆系井下沥青正构烷烃和烷基环己烷均具双主峰特征，生物标志化合物分布正常；野外剖面的沥青、油砂遭受强烈的生物降解作用。沥青、油砂与烃源岩的饱和烃、芳烃生物标志物特征对比表明，泥盆系油气来源于下寒武统筇竹寺组和下二叠统烃源岩，以筇竹寺组为主。研究成果对川西北地区天然气的进一步勘探部署和决策具有重要的指导意义。

关键词: 泥盆系, 天然气, 沥青, 烃源岩, 气源对比, 地球化学特征, 四川盆地

Abstract:

Industrial gas flows have recently been discovered for the first time in the dolomite reservoirs from Mid-Devonian Guanwushan Formation, Northwest Sichuan Basin, and its natural gas sources have attracted much attention. Based on geochemical analysis, a comprehensive study is conducted on the geochemical characteristics of Devonian natural gas, bitumen, oil sand and source rocks. The results show that the Devonian natural gas is secondary cracking dry gas dominated by hydrocarbon gases, including more than 94% of methane content, trace ethane, propane, and a small amount of non-hydrocarbon gas such as nitrogen and carbon dioxide. The δ¹³C₁ value of nature gas is ranged from -32.3‰ to -31.9‰, δ¹³C₂ values is from -28.6‰ to -28.4‰, and δ²H₁ values is from -141‰ to -138‰, indicating the hybrid gas dominated by sapropelic type. The n-alkanes and alkyl cyclohexane of Devonian downhole bitumen are characterized by two main peaks, and the biomarkers are distributed normally. The bitumen and oil sands in the outcrop section are subjected to strong biodegradation. The comparison in the biomarkers characteristics of saturated hydrocarbon and aromatic hydrocarbons between bitumen, oil sands and source rocks show that the Devonian oil and gas is sourced from the Lower Cambrian Qiongzhusi Formation and Lower Permian source rocks, dominated by Qiongzhusi Formation. The research results have important guiding significance for developing exploration and deployment solutions for natural gas in Northwest Sichuan Basin.

Key words: Devonian, natural gas, bitumen, source rock, gas-source correlation, geochemical characteristic, Sichuan Basin

中图分类号:

TE121.2

谢增业, 张本健, 杨春龙, 董才源, 裴森奇, 赵洁, 国建英, 张璐. 川西北地区泥盆系天然气沥青地球化学特征及来源示踪[J]. 石油学报, 2018, 39(10): 1103-1113.

Xie Zengye, Zhang Benjian, Yang Chunlong, Dong Caiyuan, Pei Senqi, Zhao Jie, Guo Jianying, Zhang Lu. Geochemical characteristics and source trace of the Devonian natural gas and bitumen in Northwest Sichuan Basin[J]. Acta Petrolei Sinica, 2018, 39(10): 1103-1113.

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川西北地区泥盆系天然气沥青地球化学特征及来源示踪

Geochemical characteristics and source trace of the Devonian natural gas and bitumen in Northwest Sichuan Basin

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