地震振幅差异属性在低序级断层定向识别中的应用——以塔里木盆地轮南油田为例

Application of seismic amplitude change attribute to direction identification of low-level fault: a case study of Lunnan Oilfield, Tarim Basin

凌东明 姚仙洲 田军 韩耀祖 王鹤华 郭岩松2

中国石油大学（华东）地球科学与技术学院，山东 青岛 266580 中国石油集团东方地球物理公司研究院库尔勒分院，新疆 库尔勒 841001

School of Geosciences, China University of Petroleum, Qingdao 266580, China Korla Branch of Geophysical Research Institute, BGP, CNPC, Korla 841001, China

低序级断层在油藏描述与开发井网部署中具有重要作用，受地震、地质因素影响，其初始识别精度较低，是油藏开发后期形成剩余油富集区的关键因素之一。低序级断层具有相对稳定的方向性，利用该特点计算振幅差异属性能够从本质上提高地震属性质量，凸显低序级断层的特征。在已根据钻井、测井及生产动态数据确定低序级断层走向的地区，可以运用振幅差异属性定向优化的方法，消除非断裂地质效应，突出目标低序级断层的剖面特征，提高地震属性辅助识别能力。该方法在轮南油田应用后，新的断裂解释成果与开发动态认识取得一致，井震吻合程度由53.8%提高到96.0%，可以为后续的油藏调整挖潜提供支撑。

Low-level fault is very important in reservoir description and development-well network deployment. Affected by seismic and geological factors, its initial recognition ability has poor accuracy, which is one of the key factors for the formation of residual oil accumulation area in late reservoir development. Low-level fault has relatively stable direction, and using this feature to calculate the amplitude change attribute can improve the quality of seismic attributes essentially and highlight the characteristics of fault and low-level fault. In areas that can determine the direction of low-level faults through drilling, logging and production dynamic data, it can also be optimized by the directional optimization of amplitude change attribute to eliminate the non-fault geology effect to highlight the characteristics of the target low-level fault in seismic profile and improve the ability of auxiliary identification of seismic attributes. The application of low-level fault orientation identification in Lunnan Oilfield, Tarim Basin, shows that the new result is consistent with the development dynamic data, and the degree of well seismic confidence of fit is greatly increased from 53.8% to 96.0%, which can support the need of subsequent reservoir adjustment and tap the potential.

10.6056/dkyqt201901008