高分辨率阵列声波测井反射成像储层识别方法  

Borehole Reflection Imaging Method for Reservoir Identification of High-Resolution Array Acoustic Sonic Logging

作　　者：岳文正[1] YUE Wenzheng(China University of Petroleum, Beijing 102249, China)

机构地区：[1]中国石油大学(北京),北京102249

出　　处：《测井技术》2018年第1期25-30,共6页Well Logging Technology

摘　　要：通过对阵列声波测井资料的处理,提取反射波,利用逆时偏移成像算法建立溶洞、裂缝等反射体成像特征,评价井周中尺度地质构造,进而识别储层;利用声反射成像结果对储层压裂高度、深度和破裂方位进行评价。利用该方法对中部某油田的声波测井数据进行处理,结果显示探测深度可达到30m,分辨率达到20cm,不同反射体同相轴特征不同,可以直观观察井周裂缝、溶洞发育情况。地层界面同相轴反射能量强且连续,而裂缝的同相轴表现为曲率大且持续性差。特殊地质体(如生物礁)反射特征与地震勘探相同,实现对地震成像的有效细化,并可判断反射体的具体方位。在准确地提取高分辨率反射波的基础上,开发自适应波速叠加和偏移算法,该算法可有效压制伪界面的影响,改善了垂直于井眼的反射界面成像效果。The method that use the refection wave extracted from array acoustic logging data to image the reservoir interface,fractures and vugs near the borehole with a radial distance about tens of meters shows broad application prospect,which can intuitively monitor the development of fractures and identify the reservoir type.The reflection wave can be extracted from the logging data,which can be utilized to evaluate the geo-structure of borehole scale and identify reservoir by imaging the fractures,vugs and other reflectors through reverse time migration.Meanwhile,the height,the depth and the azimuth of hydraulic fracturing can be evaluated based on the results.This method has been effectively applied in the oilfield of central China.The result shows that the depth of investigation up to 30 meters with a vertical resolution of 20 centimeters.The development of fractures and vugs near the borehole can be observed intuitively based on the characteristics of different reflectors events.Generally,the reflection energy of the event for stratigraphic interface is strong and continuous,while it is highly curving and discontinuous for the fractures.The similar event can be found in both the reflection and seismic image for the special geologic body,such as reefs,which can refine the detail of seismic image.Moreover,the azimuth of reflectors can be determined with the method.Based on the precise extraction of high resolution reflection waves,an algorithm has been developed to suppress the influence of the pseudo-interface with an adaptive velocity model for stacking and migration,which greatly improves the image accuracy of reflection interface perpendicular to the borehole axis.

关 键 词：阵列声波测井 缝洞储层 反射波成像 方位识别 

分 类 号：P631.84[天文地球—地质矿产勘探]