| 胜利油气区奥陶系顶部风化壳有机包裹体初步研究及其意义 |
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| 引用本文： | 李荣西,胡瑞忠,方维萱.胜利油气区奥陶系顶部风化壳有机包裹体初步研究及其意义[J].地质科学,2005,40(1):120-124. |
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| 作者姓名： | 李荣西 胡瑞忠 方维萱 |
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| 作者单位： | 长安大学地球科学与国土资源学院,西安,710054;中国科学院地球化学研究所,贵阳,550002 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | 胜利油气区奥陶系顶部风化壳中的气态烃有机包裹体主要分布在方解石脉中,属晚期次生成因。均一温度测量结果表明其形成温度为140～160℃,明显低于奥陶系灰泥岩的成岩温度(170～208℃)。有机包裹体气态烃成份以CH4为主(占总量的44%～49%),同时含CO2和H2O等无机气体成份。有机包裹体气态烃δ13C1为-29.2‰(PDB),δD为-128‰(SMOW),与本区已发现的来自石炭二叠系煤成天然气的δ13C1和δD相近或相同,说明胜利油气区奥陶系顶部风化壳曾经有过来自石炭二叠系煤成天然气的运移与聚集作用。该区有与陕北大气田相似的成藏地质条件,奥陶系顶部风化壳具潜在的天然气勘探价值。
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| 关 键 词： | 有机包裹体 风化壳 奥陶系 胜利油气区 |
| 文章编号： | 0563-5020(2005)01-0120-05 |
| 收稿时间： | 2001-11-12 |
| 修稿时间： | 2001年11月12 |
A PRELIMINARY STUDY ON ORGANIC INCLUSIONS OF ORDOVICIAN WEATHERING CRUST IN SHENGLI OILFIELD AND ITS SIGNIFICANCE |
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| Li Rongxi,Hu Ruizhong,Fang Weixuan.A PRELIMINARY STUDY ON ORGANIC INCLUSIONS OF ORDOVICIAN WEATHERING CRUST IN SHENGLI OILFIELD AND ITS SIGNIFICANCE[J].Chinese Journal of Geology,2005,40(1):120-124. |
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| Authors: | Li Rongxi Hu Ruizhong Fang Weixuan |
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| Institution: | 1. School of Earth Science and Land Resource, Chang’an University, Xi’an 710054;2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 |
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| Abstract: | The gaseous organic fluid inclusion in the weathering crust at the top of Ordovician in Shengli Oilfield, was a kind of secondary inclusion. The formation temperature of the organic inclusion, got by the measurements of homogenization temperature with the brine fluid inclusions lived in the same calcite vein as the organic inclusion, was 140～160 ℃, much lower than the diagenetic temperature of the host rock. The main gaseous composition of the organic inclusion was CH 4(account of 44%～49% of the total organic gas)in addition to the inorganic gas of CO2 and H2O. The δ13C1 and δD were -29.2‰(PDB)and -128‰(SMOW)respectively, almost equal to the value of the δ13C1 and δD of the nature gas from the Carbono-Permian coal. It was proposed that the Carbono-Permian coal-formed gas migrated and accumulated in the weathering crust at top of Ordovician, which could provide essential insights and help develop new exploration strategies for gas prospecting in the region, even in North China. |
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| Keywords: | Organic inclusions Weathering crust Ordovician The Shengli Oilfield |
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