井控层控Q参数建模技术在渤海地震资料高分辨率处理中的应用

Application of well-control and strata-bound Q-parameter modeling in Bohaiseismic high-resolution processing

渤海锦州A油田目的层系为古近系沙河街组,埋藏深,构造起伏大,地震资料分辨率有限,难以识别单砂体,严重制约了油田的开发生产.反Q滤波是常用的一种地震高分辨率处理方法,但目前常规的Q值求取方法在构造、流体复杂的地区难以适用.本文提出井控层控Q参数建模技术,通过流体替换、曲线方波化以及Q值比例处理,获得井点处相对准确的Q值,并在层位的约束下进行空间插值建模,从而消除流体、构造的影响,获得较为准确的Q参数用于高分辨率处理.该方法综合了井信息和构造解释成果,兼顾Q值的准确性和平面变化趋势,相较常规方法可有效提升Q值计算精度.油田实际应用效果表明,该方法可以提高构造复杂区的Q值计算精度,有效提升资料品质及对薄互储层的识别能力,为中深层构造及储层精细研究奠定基础.

In Jinzhou A oil field of Bohai Sea, the Shahejie Formation are deep burial and high structural relief. Limited seismic resolution can’t identify single sand body, so they can’t satisfy the oilfield development and production need. Inverse Q filtering is a common method of seismic high-resolution processing, but in complex structure and fluid area, the conventional Q calculating methods don’t apply. In this paper we use well-control and strata-bound Q-parameter modeling technology for seismic high-resolution processing. Through fluid replacement, curve squaring and Q value proportional treatment, the relatively accurate Q value at the well point is obtained, and the spatial interpolation modeling is carried out under the constraint of horizon. Then eliminate effects of fluid and structure, get more accurately Q-parameter. This method combines well information and structural interpretation results, and considers the accuracy of Q value and the trend of plane variation. Compared with conventional methods, the calculation accuracy of Q value can be improved effectively. The actual application results show that, this method can improve the calculation accuracy of Q value in complex region, finally improve the seismic quality and thin interbedded reservoir’s recognition ability, and lay a foundation for structure and reservoir study.