三种端元气δ13C1-Ro模型建立与应用

doi:10.11885/j.issn.1674-5086.2017.02.21.01

摘要/Abstract

摘要： 端元气δ¹³C₁-R_o模型是天然气成因判识、气源对比及混源气定量判识的重要工具。为了满足Ⅱ型有机质生成天然气识别及评价的需要，根据母质类型将有机热成因天然气划分为I、Ⅱ和Ⅲ型等3种端元气，并利用126组实测天然气数据得到3种端元气的δ¹³C₁-R_o模型。I型，δ¹³C₁=27.55 lg R_o-47.20；Ⅱ型，δ¹³C₁=25.55 lg R_o-40.76；Ⅲ型，δ¹³C₁=48.77 lg R_o-34.10（R_o < 0.9%），δ¹³C₁=22.42 lg R_o-34.80（R_o ≥ 0.9%）。为了方便模型应利用建模样品的δ¹³C₁、δ¹³C₂数据，绘制了三端元气及其混源气的别图版。根据该图版，济阳拗陷坨165、车571与孤东9井天然气分别为I和Ⅱ型端元气混源、Ⅱ型端元气与I型端元气。

关键词: 端元气, δ¹³C₁-R_o模型, 类型判识, 济阳拗陷

Abstract: End-member gas δ¹³C₁-R_o modeling is an important tool for natural gas origin identification, gas-source correlation, and mixed-source gas quantitative processing. In order to identify and evaluate type Ⅱ natural gas generated by organic matter, organic thermogenic gas is broken down into the following three types of end-member gas according to the type of parent material:Type I, Ⅱ, and I. δ¹³C₁ -R_o models for the three types of end-member gas were then developed using 126 endmember gas were then developed using 126 data sets obtained from natural I:δ¹³C₁=27.55 lg R_o -47.2; Type Ⅱ:δ¹³C₁=25.55 lg R_o -40.76; Type Ⅲ:δ¹³C₁=48.77 lg R_o -34.1, if R_o < 0.9%, and δ¹³C₁=22.42 lg R_o -34.8, if R_o > 0.9%. To facilitate application of the models, a chart was generated to identify the δ¹³C₁-δ¹³C₂ values of the three end-member gases and their mixtures using δ¹³C₁ and δ¹³C₂ data obtained from the samples for modeling. from the samples for modeling. According to the chart, the natural gases from Jiyang Depression Tuo 165, Che 571, and Gudong 9 wells are mixture of Type I and Ⅱ end-member gas, Type Ⅱ end-member gas, and Type I end-member gas, respectively.

Key words: end-member gas, δ¹³C₁-R_o model, type recognition, Jiyang Depression

中图分类号:

TE132

程付启, 朱亚杰, 金强, 洪国郎. 三种端元气δ¹³C₁-R_o模型建立与应用[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 61-68.

CHENG Fuqi, ZHU Yajie, JIN Qiang, HONG Guolang. Development and Application of Three End-member Gas δ¹³C₁-R_o Models[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 61-68.

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三种端元气δ¹³C₁-R_o模型建立与应用

Development and Application of Three End-member Gas δ¹³C₁-R_o Models

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