三种端元气δC-模型建立与应用

Development and Application of Three End-member Gas δC- Models

程付启 朱亚杰 金强 洪国郎

CHENG Fuqi ZHU Yajie JIN Qiang HONG Guolang

中国石油大学(华东)地球科学与技术学院, 山东 青岛 266580

School of Geosciences, China University of Petroleum, Shandong, Qingdao 266580, China

端元气δC-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δC-模型。I型，δC=27.55 lg -47.20；Ⅱ型，δC=25.55 lg -40.76；Ⅲ型，δC=48.77 lg -34.10（ < 0.9%），δC=22.42 lg -34.80（ ≥ 0.9%）。为了方便模型应利用建模样品的δC、δC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。

End-member gas δC- 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. δC - 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:δC=27.55 lg -47.2; Type Ⅱ:δC=25.55 lg -40.76; Type Ⅲ:δC=48.77 lg -34.1, if < 0.9%, and δC=22.42 lg -34.8, if > 0.9%. To facilitate application of the models, a chart was generated to identify the δC-δC values of the three end-member gases and their mixtures using δC and δC 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.

10.11885/j.issn.1674-5086.2017.02.21.01