正构烷烃分布模式判断柴西主力烃源岩

宋振响; 周世新; 穆亚蓬; 陈昭

doi:10.11781/sysydz201102182

正构烷烃分布模式判断柴西主力烃源岩

doi: 10.11781/sysydz201102182

1.
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
2. 中国科学院, 地质与地球物理研究所, 气体地球化学重点实验室, 兰州, 730000
3. 河南省有色金属地质矿产局, 第二地质大队, 郑州, 450016

基金项目: 国家自然科学基金项目(40572088);中国科学院知识创新工程重要方向项目(KZCX2-YW-Q05-03-05)

详细信息

作者简介:
宋振响(1983- ),男,硕士,主要从事油气地球化学研究.E-mail:szhx0606@163.com.

中图分类号: TE122.1⁺13
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出版历程
- 收稿日期: 2010-04-26
- 修回日期: 2011-02-09
- 刊出日期: 2011-04-28

Identification of chief hydrocarbon source rocks based on n-alkane distribution patterns in western Qaidam Basin

1.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China
2. Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
3. No. 2 Geological Party, He'nan Bureau of Geological Survey for Nonferrous Metals, Zhengzhou, He'nan 450016, China

摘要

摘要: 柴西原油正构烷烃分布多呈偶奇优势(CPI<1),而烃源岩样品则多呈奇偶优势分布,只有少数呈偶奇优势分布。从正构烷烃分布模式出发,结合单体烃碳同位素分析,对柴西原油和烃源岩进行对比,以确定柴西原油形成的主力烃源岩。研究表明,柴西深层主力烃源层为E₂₃,次要烃源层为E₁₊₂和N₃₁;浅层主力烃源层为N₁,次要烃源层为N₂。从生烃性能角度看,正构烷烃分布呈偶奇优势的烃源岩样品,其有机碳、氯仿沥青"A"、总烃含量、转化系数等都比呈奇偶优势分布的样品高,生烃性能较好,应为柴西主力烃源岩。
- 偶奇优势 /
- 单体烃碳同位素 /
- 正构烷烃 /
- 烃源岩 /
- 第三系 /
- 柴达木盆地西部
Abstract: The n-alkane distribution of crude oils from the western Qaidam Basin is characterized by even-to-odd (C₁₈—C₂₈) predominance. Source rocks from the region are mainly characterized by odd-to-even predominance. Based on n-alkane distribution pattern, combined with single molecule carbon isotope analysis, comparing crude oil with source rock, it was discussed in this paper the main source rocks in the western Qaidam Basin. The correlation of n-alkane distribution and single molecule carbon isotope analysis illustrated that the chief hydrocarbon source layer was E₂₃ and the secondary layers were E₁₊₂ and N₃₁ in deep region. Meanwhile, the chief hydrocarbon source layer was N₁ and the secondary layer was N₂ in shallow region. Hydrocarbon potential analysis showed that those samples with even-to-odd (C₁₈—C₂₈) predominance possessed higher TOC, bitumen "A", total hydrocarbon content and conversion ratio, displaying huge hydrocarbon generating potential.
- even-to-odd predominance /
- single molecule carbon isotope /
- n-alkane /
- hydrocarbon source rocks /
- Tertiary /
- western Qaidam Basin

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