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

谈玉明，程秀申，陈书平，何锋

摘要：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。

Abstract: 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.

10.11743/ogg20110412