| 长庆气田奥陶系风化壳气藏、气源研究 |
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| 引用本文： | 戴金星,夏新宇.长庆气田奥陶系风化壳气藏、气源研究[J].地学前缘,1999,6(Z1):195-203. |
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| 作者姓名： | 戴金星 夏新宇 |
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| 作者单位： | 石油勘探开发科学研究院,北京,100083 |
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| 摘 要： | 对10年来长庆气田奥陶系风化充气藏气源问题存在的不同观点（上古生界煤成气和奥陶系海相碳酸盐岩气何者为主）及相应的证据进行了总结和讨论,认为“奥陶系自生自储为主”的观点对地质和地球化学现象的解释存在疑问,包括用次要组分来判别混源天然气的主要来源,用不确切的端员气地球化学特征来计算混源比,对本溪组底部岩石的封盖性和下奥陶统碳酸盐岩的原始生烃潜力评价偏高,忽略了石炭系存在能够生成油型气的海相源岩。因此,长庆气田不能作为海相贫有机质的碳酸盐岩生成的大、中型油气田的实例。根据天然气及气源岩的地球化学特征,提出长庆气田奥陶系风化壳气藏气是以上古生界煤成气为主、石炭系海相源岩生成的油型气为辅的混合气。
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| 关 键 词： | 天然气成因 气源岩 煤成气 油型气 碳酸盐岩 |
| 修稿时间： | 1999年1月28日 |
RESEARCH ON SOURCE ROCK CORRELATION OF THE ORDOVICIAN RESERVOIR, CHANGQING GASFIELD |
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| Dai Jirixing Xia Xinyu.RESEARCH ON SOURCE ROCK CORRELATION OF THE ORDOVICIAN RESERVOIR, CHANGQING GASFIELD[J].Earth Science Frontiers,1999,6(Z1):195-203. |
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| Authors: | Dai Jirixing Xia Xinyu |
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| Abstract: | There are two contrast opinions about the main source of Ordovician weathered crustgas reservoir in the Changqing Gas field.One side holds that the gas from coal is from Carbeniferous-Permian coal-searn above the unconformity, and the other side holds that the gas from oilis from Ordovician marine carbenatite below it. The authors reviewed and discussed the evidences offered by the two oPinions, and points out the errors rnade in previous explanation following the opinion of "Ordovician as the main source rock": (1 ) using suberdinate componentsto determine the main source of a gas reservoir from multiple sources; (2) using incorrect geochemical values of supposed end-member to calculate the mix partial of gas from differentamrces; (3) overestimating the sealing capacity of the bottom strata of Caboniferous; (4) overestimating the initial hydrocarbon potential of lerer Ordovician Carbonate; and (5) omittingthe hydrocarbon potential of CaIfoniferous marine source rock. Based on the geological and geochemical characteristics of different gas and source rock, the authors propose that the natural gasin the Ordovician reservoir is derived maiuly from Upper Paleozoic coal-seam and partly fromCarboniferous marine hurnic-sapropelic mudstone and limestone. |
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| Keywords: | genesis of natural gas source rock of natural gas gas from coal gas from oil carbonate rock |
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