利用曲率属性进行小微断裂系统研究

The Application of Curvature Properties in Micro Fracture System Researching

马北X区块在区域挤压、走滑背景下,在工区北部和西部形成多期次、不同方向的次级断层,东西向断层形成时间较早,被后期的南北向断层切割。该断层控制了马北121构造格局。在后期北西—南东向断层作用叠加下,挤压、走滑并存,形成了一系列更次一级的小微断层,其断裂系统十分复杂。以往是用常规的构造解释方法对其断裂系统进行解释,解释有一定难度且小微断层基本分辨不清,导致某些区域油气藏类型不明、油水关系矛盾。利用地震曲率辅助断层解释技术,结合地震剖面、时间切片、测井曲线等对马北断裂系统进行精细解释验证。与以往相比,构造主体形态基本一致,但断裂系统变化较大,新增多条重要小微断层,从而解决了目前生产上存在的油水关系矛盾,明确了油气藏类型,基本符合区域构造和断裂背景。为该地区进一步的勘探开发提供有利的依据。

Under the background of extrusion and walking, the north and west of Mabei X block has formed multi periods and different directions secondary faults. For these faults , the east-west faults were formed earlier and cuted by the north-south fault in the later. What else,the fault controlled the tectonic pattern of Mabei 121. because of the NW-SE faulting in later, extrusion and strike slip were exist at the same time, a series of more secondary small micro faults were formed in research area. Finally, the fracture system is very complicated. In the past, the fracture system was explained with conventional structural interpretation methods, and there were some difficulties and some micro faults could not distinguish clearly, resulting in the type of oil and gas reservoirs in some regions aren’t clearly and there has some contradictions between the oil and water. In order to get the detailed interpretation of Mabei fault system, the seismic curvature aided fault interpretation technique was used, and combined with the seismic profile, time slice, logging curves. The results show that the main structure is basically the same, but the fracture system changes greatly, add a series of important small micro faults. The result also solves the problem in oil-water relationship, defined the types of oil and gas reservoirs, which consistent with the regional tectonic background and fracture. It is benefited for further exploration and development in this area.