| 欠压实生油岩中排烃问题的探讨 |
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| 引用本文： | 周国君,陈发景.欠压实生油岩中排烃问题的探讨[J].现代地质,1987(Z1). |
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| 作者姓名： | 周国君 陈发景 |
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| 作者单位： | 地矿部北京石油地质研究所
(周国君)，中国地质大学(陈发景) |
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| 摘 要： | 一定深度之下的生油岩中普遍有欠压实现存在,产生异常高压,开成油气初次运移的主要驱动力。对黄骅拗陷南部孔二段泥岩欠压实带发育的历史分析表明:欠压实峰值从增大到消减,是由于异常高压引起开口微裂缝的缘故。2000m为孔二段欠压实带中大量产生开口微裂缝的深度,萤光资料可证实这一点。孔二段的生油门限是2600m,因而2900m是其大量排烃深度,地化指标的变化也表明有效生油岩分布在2900m以下。
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EXPELLING OF HYDROCARBON IN THE UNDERCOMPACTED OIL-SOURCE ROCKS |
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| Abstract: | The clay of source rocks below certain depth is generally undercompacted. Historical analysis of undercompacted EK2 muds tone has shown the peak of the imdcrcompacteu zone decreases under certain depth,mainly due to development of micro - fracture caused by abnormally high pressure. The depth of micro-fracture developed in EK2 undercompacted zone is 2900m, which is also verified by fluorescence data. The geochemical evidences have also shown a great quantity of hydrocarbons are expelled under 2900m. |
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