渤海海域重力异常特征及油气分布规律探讨

通过研究渤海湾盆地渤海海域重力异常特征，划分研究区构造单元，探讨重力异常特征与油气分布之间的规律。在对渤海湾盆地渤海海域剩余重力异常和重力垂向二阶导数异常特征分析的基础上，结合前人在区域地质方面的研究成果．划分了渤海海域的构造单元，对已发现的油气田分布与局部重力异常特征间的联系进行了研究，并讨论了油气分布规律．预测了油气有利靶区。渤海海域地区油气田分布与局部重力高之间存在很强的相关性；被生油凹陷包围的凸起区（即局部重力高带）是寻找油气最有利的靶区：凹陷和凸起过渡部位的断阶带（即局部重力高和局部重力低的过渡部位）也是寻找油气不可忽视的区域．

Features of gravity anomaly and oil-gas distribution rules in Bohai Sea Area

This paper analyzes the features of gravity anomaly in Bohai Sea Area in the Bohai Bay Basin, divides the tectonic units and discusses the rules between gravity anomaly features and oil-gas distribution in the area. On the basis of analyzing the features of residual gravity anomaly and vertical second derivative anomaly and the previous research resuhs in areal geology, the tectonic units are divided in Bohai Sea Area, and the conection between the feature of local gravity anomaly and distribution of oil-gas fields are researched. Then the oil-gas distribution rules are discussed and potential targets are concluded. The tectonic units of Bohai Area were confirmed, and the gravity anomaly features and the oil-gas distribution rules are obtained. The results show that there is a great relativity between the distribution of oil-gas fields and high-value anomaly of local gravity in Bohai Sea Area. The uplift areas surrounded by petroleum generation sags （i.e. high-value zones of local gravity） are the potential targets of oil and gas exploration. The fault zones between sags and uplifts（i.e, the transition areas between high-value zone of local gravity and low-value zone of local gravity） are also the significant exploration areas of oil and gas.