New Improved Delta Carbonate Method Used for Surface Geochemical Exploration for Petroleum

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• 作者：Qianyong Liang ; Yongqiang Xiong ; Jing Zhao ; Kebin Zhao ; Zongyuan Zhang ; Yun Li ; Wu Li ; Changqing Sun
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：May 15, 2014
• 年：2014
• 卷：28
• 期：5
• 页码：3016-3023
• 全文大小：409K
• 年卷期：v.28,no.5(May 15, 2014)
• ISSN：1520-5029

文摘

The delta carbonate (螖C) method is a common used surface geochemical exploration technique for oil and gas geochemical surveys in China. However, its application effectiveness is unsatisfactory because of the unidentified origins of CO₂ that form 螖C. In this study, a gold tube pyrolysis technique, coupled with gas chromatography (GC) and gas chromatography鈥搃sotope ratio mass spectrometry (GC鈥揑RMS) detection, was employed to simultaneously measure the concentration and carbon isotopic composition of 螖C in surface soils. Experimental conditions for the 螖C analysis were determined by condition experiments, and the reproducibility and repeatability of the method were tested and found to be satisfactory. Subsequently, this new and improved 螖C method was applied to the Duoshiqiao area of the Jiyang depression in Bohai Bay Basin, China. Halo anomalies are found based on the concentrations and carbon isotopic compositions of 螖C. These are consistent with the actual distribution of known oil and gas accumulations in the region. The carbon isotopic composition of 螖C in the study area ranges from 鈭?鈥?to 鈭?鈥?[Vienna Peedee belemnite (VPDB)], possibly representing a special hydrocarbon seepage model with a relatively rapid leakage rate and partial chemical or biochemical oxidation of these migrated hydrocarbons from the subsurface. Combining concentration measurements of 螖C with its carbon isotopic values may be a promising method for accurately locating subsurface hydrocarbon seepage.