| 松辽盆地徐深1井气藏气源的氢、碳同位素特征 |
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| 引用本文： | 薛海涛,刘海英,卢双舫,霍秋立,徐庆霞,李吉君.松辽盆地徐深1井气藏气源的氢、碳同位素特征[J].地质科学,2009,44(2):635-644. |
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| 作者姓名： | 薛海涛 刘海英 卢双舫 霍秋立 徐庆霞 李吉君 |
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| 作者单位： | 1. 大庆石油学院地球科学学院, 黑龙江, 大庆, 163318;
2. 大庆油田有限责任公司勘探开发研究院, 黑龙江, 大庆, 163712 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展规划(973计划) |
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| 摘 要： | 选取松辽盆地内泥岩样品和煤样进行热模拟实验，建屯了两个样品成甲烷的氢、碳同位素分馏动力学模型并标定了动力学参数.分别以徐深1井区、沉降中心地质资料为例进行研究，表明两处源岩均有短期内大量生气的特点，气源岩生气期分别为距今95.5～73 Ma和距今0～73 Ma.计算得到两处源岩沙河子组暗色泥岩和煤、火石岭组暗色泥岩和煤所生天然气单独运聚成藏（自开始生烃到现今累积成藏）所对应的δDCH4 和δ13C1，进而定量计算出徐深1井区源岩所生甲烷的δDCH4 为-237.3‰，δ13C1为-28.8‰，沉降中心气源岩所生甲烷的δDCH4 为-2.5‰，δ13C1为-24.8‰.以各区域天然气混合后的δDCH4 作为来源气体的端元同位素值，根据物质平衡原理计算得到：徐深1井区源岩对该区气藏的贡献比例约占72%，沉降中心源岩的贡献比例约为28%.同理以δ13C1.方法得到徐深1井区源岩对该区气藏的贡献比例约占66%，沉降中心源岩的贡献比例约为34%.氢、碳同位素分馏的化学动力学地质应用结果存在的差异与同位素分馏模型标定所用热模拟实验为不加水实验有关.
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| 关 键 词： | 氢同位素 碳同位素索 气源 沉降中心 徐深1井 松辽盆地 |
| 收稿时间： | 2007-12-22 |
| 修稿时间： | 2007-12-22; |
Characteristics of hydrogen and carbon isotopes of gas sources in the Well Xushen 1 gas reservoir of the Songliao Basin |
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| Xue Haitao,Liu Haiying,Lu Shuangfang,Huo Qiuli,Xu Qingxia,Li Jijun.Characteristics of hydrogen and carbon isotopes of gas sources in the Well Xushen 1 gas reservoir of the Songliao Basin[J].Chinese Journal of Geology,2009,44(2):635-644. |
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| Authors: | Xue Haitao Liu Haiying Lu Shuangfang Huo Qiuli Xu Qingxia Li Jijun |
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| Institution: | 1. Daqing Petroleum Institate, Daqing, fleilongjiang 163318;
2. Exploration and Development Research Inatitute of Daqing Oilfield Company Ltd., Daqing, Heilongjiang 163712 |
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| Abstract: | The dark mudstone sample from Shahezi Formation of the Well Du 13 and coal sample from Yingcheng Formation of the Jilin Yingcheng Coal Mine in the Songliao Basin were selected for pyrolysis, in which the chemical kinetic models of methane generated from oil and its fractionation of hydrogen and carbon isotope were constructed and calibrated.Taking geological data of Block Xushen 1 and the subsidence centre for example, the geological application indicated that both source rocks generated a large quantity of natural gas in a short time.The gas generation period of source rocks of the Block Xushen 1 was 95.5-73 Ma ago,and that of the subsidence centre was 100-73 Ma ago.The corresponding values of δDCH4 and δ13C1, of migrating and accumulating natural gas(generated by dark mudstones and coals of Shahezi and Huoshiling Formations' source rocks in the both places)were calculated.And then δDCH4 of methane generating from source rocks of the Block Xushen 1 was calculated as -237.3‰, δ13C1 as -28.8‰;δDCH4 of methane generating from source rocks of the subsidence centre was calculated as -102.5‰,δ13C1 as -24.8‰.Regarding δDCH4 of the mixing natural gas as the end-member value of isotope, it could be figured out, based on the material balance principle, that the contribution of gas source rocks of the Block Xushen 1 accounted for 72%,and that of the subsidence centre was 28%.In the same way, by means of δ13C1, the contribution of gas source rocks of the Block Xushen 1 accounted for 66%,and that of the subsidence centre was 34 %.There was a difference between the results of geological application of hydrogen and carbon isotope fractionation chemical kinetics.The difference might be caused by the pyrolysis no-water experiment,which was used to calibrate isotope fractionation model. |
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| Keywords: | Hydrogen isotope Carbon isotope Gas sources Subsidence centre The Well Xushen 1 The Songliao Basin |
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