松辽盆地庆深气田天然气成因类型鉴别

杨春; 刘全有; 周庆华; 李剑; 冯子辉; 李志生

松辽盆地庆深气田天然气成因类型鉴别

杨春¹,
刘全有^2, ,,
周庆华³,
李剑⁴,
冯子辉⁵,
李志生⁴

1.
浙江大学地球科学系, 浙江杭州 310027
2.
中石化石油勘探开发研究院, 北京 100083
3.
中国石油勘探开发研究院, 北京 100083
4.
中国石油勘探开发研究院廊坊分院, 河北廊坊 065007
5.
中国石油大庆油田勘探开发院, 黑龙江大庆 163712

基金项目:

国家自然科学基金项目 40802028

国家基础研究“973”项目 2005CB422108

中国石油天然气股份有限公司科学研究与技术开发项目 07-01C-01-07

详细信息

作者简介:
杨春(1981-), 男, 博士, 主要从事天然气地质学及地球化学研究

通讯作者:
刘全有, E-mail: qyouliu@sohu.com

中图分类号: P618.13
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- 文章访问数: 3443
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- 被引次数: 0
出版历程
- 收稿日期: 2009-02-20
- 刊出日期: 2009-09-25

Genetic Identification of Natural Gases in Qingshen Gas Field, Songliao Basin

1.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2.
Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
4.
Langf ang Branch, Research Institute of Petroleum Exploration and Development, PetroChina, Langfang 065007, China
5.
Daqing Oil Company, PetroChina, Daqing 163712, China

摘要

摘要: 通过对松辽盆地徐家围子烃源岩和原油热模拟实验、烷烃气碳同位素组成分析, 认为在高演化阶段单一热力作用可以引起重烃气(δ¹³C₂ > δ¹³C₃ > δ¹³C₄) 碳同位素组成倒转, 但CH₄与C₂H₆(δ¹³C₁ > δ¹³C₂) 却很难发生倒转.庆深气田天然气重甲烷碳同位素组成、烷烃气碳同位素完全倒转、高稀有气体同位素组成(R/Ra > 1.0), 说明该气田天然气来源具有多样性.利用R/Ra与CO₂/³He和R/Ra与CH₄/³He关系对庆深气田天然气成因类型进行识别, 认为该气田烷烃气中甲烷有部分为无机成因, 重烃气则为有机成因.该地区高地温梯度导致有机成因重烃气碳同位素组成发生倒转, 而CH₄与C₂H₆碳同位素组成倒转主要与重碳同位素的无机甲烷混入有关.
- 庆深气田 /
- 热模拟实验 /
- 碳同位素组成 /
- 无机成因气 /
- 有机成因气
Abstract: According to measurement of carbon isotopes of gaseous alkanes thermally cracked from the hydrocarbon sources and oil under closed system pyrolysis, the results suggest that the reversal occurrence for carbon isotopes of heavy gaseous alkanses (δ¹³C₂ > δ¹³C₃ > δ¹³C₄) would be caused by single thermal dynamics, whereas the reversal trends of δ¹³C₁ and δ¹³C₂ (δ¹³C₁ > δ¹³C₂) could not be observed.The natural gases in the Qingshen gas field are characterized by the less negative δ¹³C₁ values, reversal series of carbon isotopes for gaseous alkanes and high R/Ra values (R/Ra > 1.0), indicating natural gases should have stemmed from multi-sources.Based on the correlation of R/Ra and CO₂/³He, R/Ra and CH₄/³He, the genesis of natural gases from the Qingshen gas field were identified.The hydrocarbon gases in the Qingshen gas field are a mixture of alkanes, in which the heavy gaseous alkanes were derived from the thermal decomposition of organic matters due to the high geothermal gradient, whereas mixing of inorganic methane into organic gas caused the reversal of the carbon isotopic trend of CH₄ and C₂H₆.
- Qingshen gas field /
- pyrolysis experiment /
- carbon isotope /
- inorganic gas /
- organic gas

HTML全文

图 1 庆深气田烷烃气碳同位素组成变化

Fig. 1. Plot of δ¹³C values of individual n-alkanes vs. carbon number for gas samples from the Qingshen gas field, Songliao basin

下载: 全尺寸图片幻灯片

图 2 庆深气田R/Ra与CO₂/³He (a)和R/Ra与CH₄/³He (b) 关系

Fig. 2. Plots of R/Ra ratios versus CO₂/³He (a) and CH₄/³He (b) two component mixing of CO₂ between crustal and mantle end-members

下载: 全尺寸图片幻灯片

表 1 松辽盆地徐家围子烃源岩与原油热模拟实验烷烃气碳同位素组成

Table 1. Carbon isotope compositions of alkane gases from possible source rocks and crude oils in the closed system pyrolysis

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