东濮凹陷复杂断块群及勘探潜力分析

Complex fault-block groups in Dongpu Sag and their exploration potential

断块群是东濮凹陷最重要的油气圈闭类型,东濮凹陷特殊的构造位置和局部变形条件形成了复杂断块群。根据油田勘探开发资料,分析了东濮凹陷复杂断块群的特点、形成机制、成藏条件和勘探潜力。东濮凹陷复杂断块群除具有一般断块群的特点外,明显表现为上、下及左右的镜像关系和多变的转换关系,断块群的复杂性与多变的动力条件、多期次的伸展变形、复杂的局部条件和多类型的变形介质有关。东濮凹陷具有良好的生、储、盖条件,断块是其基本的聚油单元,虽然单个断块面积较小,但断块的成群出现形成了良好的圈闭条件,而断层又构成了主要的运移通道,因此东濮凹陷的复杂断块群勘探潜力大,仍是未来勘探的主要对象。

Fault-block groups are the most important ＇ cradle＇ for oil/gas traps in Dongpu Sag whose distinctive tectonic setting and local deformation offered favorable conditions for the formation of complex fault-block groups.Based on exploration and development data,we studied the characteristics,formation mechanism, reservoir-forming condition,and exploration potential of the complex fault-block groups.Besides the general features of fault-block groups,the distinguishing characteristics of these groups in Dongpu Sag are of mirror image relationships both in vertical and horizontal directions.The complexity of the fault-block groups is related to varying dynamics,multi-phase extension,complicated local deformation condition and different deformation rocks. Dongpu Sag contains good source rocks,reservoirs and cap rocks.The fault blocks here serve as elementary oil/ gas accumulation units.Although an individual fault block may be small,the fault-block groups form favorable traps with the faults acting as major migration paths.The fault-block groups in Dongpu Sag have great exploration potentials,and can still be regarded as major exploration targets in the future.