| 泌阳凹陷深凹区古流体压力演化与油气充注耦合关系 |
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| 引用本文： | 张鑫,陈红汉,孔令涛,龙昭.泌阳凹陷深凹区古流体压力演化与油气充注耦合关系[J].地球科学,2020,45(5):1769-1781. |
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| 作者姓名： | 张鑫 陈红汉 孔令涛 龙昭 |
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| 作者单位： | 1.中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家重点自然科学基金项目41730421中国石油化工股份有限公司“十三五”重大科技专项ZDP1705 |
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| 摘 要： | 泌阳凹陷深凹区蕴含可观的岩性油气藏，现今压力大多显示为常压-弱超压系统.利用盆地数值模拟和流体包裹体热动力学模拟相结合，揭示了深凹区古压力演化历史.生烃历史显示泌阳凹陷持续埋藏到廖庄组沉积末期达到最大埋藏深度（约23.03 Ma）时，达到生烃高峰期；随后地层抬升，生烃强度减弱并趋近于停止.深凹区砂岩储层中检测到两种不同成分油包裹体，即成熟度低的橙黄色荧光油包裹体和成熟度相对较高的蓝绿色荧光油包裹体.包裹体均一温度结合埋藏史显示深凹区油气充注时间分别为35.4~30.3 Ma和27.8~26.5 Ma.盆地数值模拟显示深凹区从39.3 Ma开始压力持续增加，到约23.03 Ma时，即埋藏最深时发育显著的超压，压力系数可达1.5左右，之后超压减弱，演化至现今的常压-弱超压系统.包裹体热动力学模拟恢复的古压力也显示相似的演化趋势.总体上，生烃期，充注期以及超压形成期三者在时间上的耦合表明深凹区是由生烃增压下驱动两期油气充注以至形成现今的岩性油气藏.
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| 关 键 词： | 古流体压力 油气充注 流体包裹体 泌阳凹陷 油气地质 |
| 收稿时间： | 2019-05-22 |
The Coupling Relationship between Paleofluid Pressure Evolution and Hydrocarbon-Charging Events in the Deep of Biyang Depression,Central China |
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| Abstract: | The deep area of Biyang depression contains considerable lithologic hydrocarbon reservoirs, and the present pressure is mostly shown as normal-weak overpressure system. In this study, the paleopressure evolution history of the deep depression has been revealed combining with the numerical simulation and thermodynamics of fluid inclusion. The hydrocarbon generation history shows that the Biyang depression reached the peak of hydrocarbon generation when it reached the maximum burial depth at the end of the sedimentation of the Liaozhuang Formation (about 23.03 Ma). After the formation uplift, the hydrocarbon generation weakened and approached to a stop. Two different oil inclusions were detected in the deep sandstone reservoir, which were the orange-yellow fluorescent oil inclusion with low maturity and the blue-green fluorescent oil inclusion with relatively high maturity. The homogenization temperature of the inclusion combined with the burial history chart shows that the hydrocarbon charging time is 35.4-30.3 Ma and 27.8-26.5 Ma respectively. The numerical simulation results show that the pressure in the deep continued to increase from 39.3 Ma, and reached an obviously overpressure at about 23.03 Ma at the deepest burial. The pressure coefficient reached to about 1.5, and then the overpressure weakened and evolved into the present normal-weak overpressure system. The paleo-pressure of the thermodynamic simulation of the inclusions also shows a similar evolutionary trend. In conclusion, the coupling of the hydrocarbon generation period, the charging event and the overpressure period indicate that the present lithologic reservoir in deep is attributed to two-stage hydrocarbon charging driven by overpressure caused by hydrocarbon generation. |
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