复杂断块区低级序断层的井-震联合识别

由于断距小、延伸长度短，低级序断层在地震资料上难以识别，成为影响复杂断块油气开发的一个重要因素。为此，对东营凹陷永3断块内断距在3m以上的低级序断层进行精细刻画。首先，利用开发后期高密度井网的优势，依据同一沉积微相中邻井测井曲线的相似性，构建低级序断层发育系数，并逐点计算，以小波重构后的测井曲线为辅助条件，定量识别井钻遇的低级序断层；其次，在精确的井-震标定及断点投影约束下，利用井钻遇断点指导地震剖面的低级序断层解释，并引导蚂蚁痕迹对低级序断层的平面追踪。该套方法能将测井数据在垂向上高分辨率的优势与地震资料在横向上对低级序断层追踪的能力相结合，即井—震联合，从点（井点）—线（地震剖面）—面（沿层属性）三个角度依次推进、实现对低级序断层的识别。经注采井网的生产动态数据等验证，识别效果较好，能有效剔除岩性变化等“伪断层”响应的干扰。因此，该方法既提高了低级序断层的解释精度，降低了对人工经验的依赖程度，又为后期井网的调整提供指导。

Low-grade fault identification in complex fault-block zones based on well and seismic data

It is very difficult to identify low-grade faults due to small fault displacements and short extended length,which affects the hydrocarbon exploration and production in complex fault-block zones for the late stage of oilfield development.We propose an approach to identify low-grade faults with above 3m fault displacement in the fault block Yong 3,Dongying Sag with the joint use of logging and seismic data.This is a high-density well pattern zone.First,the similarity of same-microfacies logging curves between neighboring wells is used to obtain the development index of low-grade faults,and low-grade fault breakpoints encountered by drilling are quantitatively identified.Then drilling information is used to guide the seismic data interpretation after an accurate well-seismic calibration.Plane distribution characteristics of low-grade faults are depicted based on ant traces under the guide of these fault breakpoints.The approach takes advantages of high vertical resolution in logging data and seismic lateral information.The low-grade fault interpretation is realized from a point-line-surface (well-seismic line-horizon attributes) aspect.The low-grade fault identification in the study area with the proposed approach is verified by the dynamic production of the oilfield,which provides a very helpful reference for the oilfield future development.