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

doi:10.11885/j.issn.1674-5086.2017.02.21.01

Abstract

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

CLC Number:

TE132

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

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