Research on the Correlation between Methane and Hydrogen in Acid-hydrolyzed Gases for Geochemical Exploration Samples
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摘要: 酸解烃是油气化探方法中准确度相对较高的一项指标，已得到广泛的应用，深入研究酸解气有助于对其机理的进一步解释，并且有利于开发新的分析指标。本文利用气相色谱法测定了油气化探样品经盐酸分解后所得气体中烃类组分与非烃气体组分的含量，发现了酸解气中甲烷与氢气的含量具有正相关性。进而通过X射线荧光光谱和X射线衍射分析样品的元素和矿物组成、样品再粉碎分析以及激光拉曼光谱分析包裹体成分等实验，获得以下结论：①酸解气中的甲烷和氢气含量与样品元素组成无关，与碳酸盐矿物正相关，其含量可以反映深部油气的情况；②两种气体并不是以物理吸附形式存在于样品中，而是存在于更小的空间内，证明了酸解烃分析方法具有相当高的稳定性；③获得了甲烷和氢气同时存在于包裹体的直接证据，由此推测这两种气体可能具有同源性。由于甲烷和氢气含量相关性的存在，酸解脱气中氢气的含量测定有望成为油气化探的新指标，应用于油气资源调查。Abstract: Acidolysis hydrocarbon is an important index with relatively high accuracy in the geochemical exploration for oil and gas and has been widely used. Detailed study of acid-hydrolyzed gases can help further explain its mechanism and help develop new analytical indicators. The content of acidolysis hydrocarbons and other gas released by hydrochloric acid in the samples from geochemical exploration for oil and gas by Gas Chromatography have been determined, and are presented in this paper. There is a positive correlation between the contents of methane and non hydrocarbon gas. The elements and mineral composition of the sample were measured by X-ray Fluorescence Spectrometry (XRF) and X-ray Diffraction (XRD), respectively, whereas the gas-liquid inclusion composition was analyzed by Laser Raman Spectroscopy after sample smashing. The conclusions are as follows:(1) The content of methane and hydrogen in the acidolysis hydrocarbons is independent of the elemental composition of the sample and is positively related to the carbonate minerals. The contents of methane and hydrogen can reflect the situation of deep oil and gas. (2) Two kinds of gas do not exist in the form of physical adsorption but in the smaller space. It is proved that the analysis method of acid hydrolysis hydrocarbon has high stability. (3) There is direct evidence that two kinds of gases exist in the inclusions at the same time, which infers that two types of gases have the same source. Due to the correlation between methane and hydrogen, the content of hydrogen from acidolysis hydrocarbons will be a new analysis index in the geochemical exploration for oil and gas.
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Key words:
- geochemical exploration for oil and gas /
- acidolysis hydrocarbons /
- inclusion /
- methane /
- hydrogen
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表 1 10个样品中各类矿物的X射线衍射数据
Table 1. The X-ray diffraction data of minerals in 10 samples
矿物种类 各样品中各类矿物的含量(%) 003 014 030 046 059 067 069 110 130 143 石英 42.4 44.6 48.6 42.4 42.6 39.2 48.9 43.5 39.3 39.9 斜长石 15.8 17.2 15.1 16.6 16 26.1 16.6 17.2 17.2 16.5 钾长石 5.2 4.1 4.1 4.0 3.6 1.6 3.5 3.1 5.6 1.8 方解石 16.7 12.4 10.2 18.6 14.4 1.3 12.5 14.2 14.3 18.8 白云石 1.3 1.4 - 2.0 3.4 0.5 - 2.0 2.0 2.9 菱铁矿 0.8 - - 0.6 - - - - - - 角闪石 1.2 1.3 1.1 1.3 2.5 3.3 1.7 1.0 1.1 2.6 赤铁矿 - - 0.9 - - 1.0 0.8 - - - 蒙脱石 1.0 - - - - 2.0 - 1 - - 伊蒙混层 - - 13.0 - - - - - - - 伊利石 8.0 9.0 7.0 9.5 12.0 10.0 9.0 11.5 9.0 绿泥石 7.6 6.0 5.0 7.5 6.0 13.0 6.0 6.0 6.0 8.5 高岭石 - 4.0 2.0 - 2.0 - - 3.0 3.0 - 
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