Geochemical Characteristics of Hydrocarbon Gases and&nbsp; Its Genetic Analysis in Nai 1 Block，Naiman Oilfield

ZHAO   Xin-Qi, CHEN  Jian-Fa, ZHANG  Chen, LI  Qing-Chun, TANG  You-Jun, ZHANG  Jun-Hua

doi:10.11764/j.issn.1672-1926.2011.04.715

Natural Gas Geoscience >

2011 , Vol. 22 >Issue 4: 715 - 722

DOI: https://doi.org/10.11764/j.issn.1672-1926.2011.04.715

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Geochemical Characteristics of Hydrocarbon Gases and Its Genetic Analysis in Nai 1 Block，Naiman Oilfield

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1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum，Beijing 102249，China；
2.Research Institute of Exploration and Development，Liaohe Oilfield Company，CNPC，Panjing 124010，China;
3.Key Laboratory of Exploration Technologies for Oil and Gas Resources，Ministry of Education，Yangtze University，
Jingzhou 434023，China

Received date: 2010-10-22

Revised date: 2010-11-30

Online published: 2011-08-10

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Abstract

Although the Naiman depression has made a breakthrough and gotten the commercial oil flow during 20 years petroleum exploration,the geochemistry of natural gas and its origin is not reported.Based on the chemical and carbon isotopic compositions of natural gas for 38 gas samples from the Naiman 1 block，we discuss the geochemical characteristic of hydrocarbon gases and their origin,in combination with geological background.Natural gas was derived from sapropelic organic matter at low-mature or mature stage,whose origin is of oil-type gas.Natural gas has the dominant CH₄ concentration and moderate heavy hydrocarbon gas,with low dry coefficient,showing the typical wet gas.Based on stable carbon isotope and thermal maturity for hydrocarbon gases，we consider that natural gas in this study is oil-associated gas.Values of δ¹³C₁，C₁/C_1-5,iC₄/nC₄ and iC₅/nC₅ in the natural gas from the upper part of Jiufotang Formation more than those from the lower part is related to thermal maturity.

Key words： Hydrocarbon gases; Chemical composition; Carbon isotope; Genesis; Nai 1 block; Naiman oilfield.

Cite this article

ZHAO Xin-Qi, CHEN Jian-Fa, ZHANG Chen, LI Qing-Chun, TANG You-Jun, ZHANG Jun-Hua . Geochemical Characteristics of Hydrocarbon Gases and Its Genetic Analysis in Nai 1 Block，Naiman Oilfield[J]. Natural Gas Geoscience, 2011 , 22(4) : 715 -722 . DOI: 10.11764/j.issn.1672-1926.2011.04.715

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