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THERMAL EVOLUTION AND HYDROCARBON ENTRAPMENT IN THE WEIBEI SAG, CHANGWEI DEPRESSION
Author(s): 
Pages: 332-341
Year: Issue:  3
Journal: CHINESE JOURNAL OF GEOLOGY

Keyword:  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;
Abstract: 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4.4~5.3℃/100m,随后地温梯度逐渐降低,沙河街组四段沉积时期为4.2~4.9℃/l00m,馆陶组沉积时期为4.0~4.7℃/km,现今为3.8~4.2℃/km.同时,根据测量的包裹体均-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52~50.5 Ma),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43.5-36 Ma).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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