| 昌潍坳陷潍北凹陷热历史和油气成藏期次 |
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| 引用本文： | 邱楠生, 蔡进功, 李善鹏, 曾溅辉. 昌潍坳陷潍北凹陷热历史和油气成藏期次[J]. 地质科学, 2003, 38(3): 332-341. |
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| 作者姓名： | 邱楠生 蔡进功 李善鹏 曾溅辉 |
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| 作者单位： | 石油大学油气成藏机理教育部重点实验室,北京,102249;胜利油田有限公司地质研究院,山东东营,257062 |
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| 基金项目： | SINOPEC“十五”攻关项目的资助 |
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| 摘 要： | 根据镜质体反射率数据和磷灰石裂变径迹数据模拟计算了昌潍坳陷潍北凹陷 6口井的热演化历史,认为在孔店组沉积时期的古地温梯度较高,可达 4.4～53℃/100m,随后地温梯度逐渐降低,沙河街组四段沉积时期为 4.2～49℃/100m,馆陶组沉积时期为 4.0～47℃/km,现今为 3.8～4.2℃/km。同时,根据测量的包裹体均一温度数据和恢复样品的沉积埋藏历史、源岩的热演化历史和生烃史,认为该区有两期油气充注,第一期在孔店组沉积末期(距今 52～50.5Ma),第二期发生在沙河街组四段沉积中期至沙河街构造运动期间(距今 43.5～36Ma)。沙河街构造运动对潍北凹陷的油气成藏有重要影响,潍北凹陷的油气充注以第二期的充注为主。
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| 关 键 词： | 潍北凹陷 热历史 油气成藏 流体包裹体 镜质体反射率 磷灰石裂变径迹 |
THERMAL EVOLUTION AND HYDROCARBON ENTRAPMENT IN THE WEIBEI SAG, CHANGWEI DEPRESSION |
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| Qiu Nansheng, Cai Jingong, Li Shanpeng, Zeng Jianhui. THERMAL EVOLUTION AND HYDROCARBON ENTRAPMENT IN THE WEIBEI SAG, CHANGWEI DEPRESSION[J]. Chinese Journal of Geology, 2003, 38(3): 332-341. |
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| Authors: | Qiu Nansheng Cai Jingong Li Shanpeng Zeng Jianhui |
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| Affiliation: | 1. Key Laboratory for Hydrocarbon Accumulation Mechanism, Ministry of Education, University of Petroleum, Beijing 102249; 2. Institute of Geology, The Shengli Oilfield Corp., Dongying, Shandong 257062 |
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| Abstract: | The thermal regime of the Weibei Sag, Changwei Depression, was modeled by using the vitrinite reflectance(Ro)and apatite fission track data. The thermal gradient was up to 4.4～5.3℃/100m during the Eocene to Miocene(sedimentary period of the Kongdian Formation)from six wells’ modeling results. The thermal gradients decreased with the geological evolution of the sag. It was 4.2～4.9℃/100m, 4.0～4.7℃/100m during sedimentary periods of the 4th Member, Shahejie Formation and the Guantao Formation respectively. The present thermal gradient was 3.8～4.2℃/100m. At the same time, two hydrocarbon entrapments were identified by using the homogenization temperatures of fluid inclusions, combining with the burial history of samples, thermal history and hydrocarbon generation history of source rocks. The first hydrocarbon entrapment occurred during 52～50.5 Ma ago, and the second entrapment was during 43.5～36 Ma ago, the latter was the most important entrapment to the hydrocarbon accumulation in the Weibei Sag. |
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| Keywords: | Thermal history Hydrocarbon entrapment Vitrinite reflectance Apatite fission track Fluid inclusion The Weibei Sag |
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