Genetic types and geochemical characteristics of natural gases in the Jiyang Depression, China

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• 作者：Wen-Tao Li (1) (2)
  Yang Gao (2)
  Chun-Yan Geng (2)
  
  1. School of Energy Resources ; China University of Geosciences ; Beijing ; 100083 ; China
  2. Geoscience Research Institute ; Shengli Oilfield Company SINOPEC ; Dongying ; 257015 ; Shandong ; China
  
• 关键词：Genetic types ; Natural gases ; Jiyang Depression ; Light hydrocarbon properties ; Carbon isotope ratios ; Identification factors
• 刊名：Petroleum Science
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：12
• 期：1
• 页码：81-95
• 全文大小：890 KB
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• 刊物主题：Mineral Resources; Industrial Chemistry/Chemical Engineering; Industrial and Production Engineering; Energy Economics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1995-8226

文摘

Natural gases were widely distributed in the Jiyang Depression with complicated component composition, and it is difficult to identify their genesis. Based on investigation of gas composition, carbon isotope ratios, light hydrocarbon properties, as well as geological analysis, natural gases in the Jiyang Depression are classified into two types, one is organic gas and the other is abiogenic gas. Abiogenic gas is mainly magmatogenic or mantle-derived CO2. Organic gases are further divided into coal-type gas, oil-type gas, and biogas according to their kerogen types and formation mechanisms. The oil-type gases are divided into mature oil-type gas (oil-associated gas) and highly mature oil-type gas. The highly mature oil-type gases can be subdivided into oil-cracking gas and kerogen thermal degradation gas. Identification factors for each kind of hydrocarbon gas were summarized. Based on genesis analysis results, the genetic types of gases buried in different depths were discussed. Results showed that shallow gases (