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Integration of Microelectrical and Sonic Reflection Imaging Around the Borehole-Offshore UAE

机译：微电子和声反射成像在井眼-阿联酋周围的整合

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Horizontal wells are commonly used worldwide to improvernrecovery of petroleum resources. Offshore Abu Dhabi, therncarbonate reservoir contains sub-seismic features such asrnfaulting and fractures that impact production and enhancedrnrecovery. This paper is an attempt to identify and linkrnfractures and faults observed near borehole with surfacernseismic in order to provide insight into their extent,rndistribution, characterization and implications on the reservoirrnproduction. The study resolved structural interpretationrnuncertainty in the 3D seismic, highlighted the variability in therninjected water front advancement, and provided arnmethodology to link fine scale observation from microelectricalrnimage logs to intermediate sonic measurements andrnsurface seismic.rnConventional sonic logging is similar to refraction seismicrnexperiments carried out on the earth’s surface except that, forrnthe sonic, the source is higher frequency and the sourcernreceiver distance and receiver spacing is much closer. Thisrnallows the sonic to achieve a higher resolution velocityrnmeasurement over a shorter interval.rnSonic logging waveforms can also be processed forrnreflection information in a similar way to reflection surfacernseismic. Its higher frequency source thus allows for muchrnhigher resolution reflection information tens of feet away fromrnthe well.rnThe structural dip computations from pilot and horizontalrnimage logs were linked with sonic reflections to markrnprobable fault locations and to construct a geological crosssection,rnwhich used to define the different reservoir layers that intersected along the well trajectory. Structural lineamentsrn(faults and fracture zones) within a given reservoir layer werernextended away from borehole by utilizing sonic waveforms.rnDue to small fault displacement (<4 m) the fault was notrnoriginally picked on the surface seismic, but overlaying therninterpretation on the attributes indicates the possibility of arnfault. The results were subsequently validated by injectionrnprofile. Mapping these lineaments improved seismicrninterpretation, which ultimately lead to better well placementrnand validated existing dynamic data.
机译：水平井在世界范围内通常用于改善石油资源的采收率。在阿布扎比海上，碳酸盐岩储层具有次地震特征，如断层破裂和影响生产和提高采收率的裂缝。本文旨在识别和联系在井眼附近的裂缝和断层与地表地震，以便深入了解其范围，分布，特征及其对储层生产的影响。这项研究解决了3D地震中结构解释的不确定性，强调了注水前沿发展的变化性，并提供了方法学，将微电图像测井的精细观测与中间声波测量和地表地震联系起来。常规声波测井类似于在地球上进行的折射地震实验在表面上，除了声波之外，声源的频率更高，并且声源的接收器距离和接收器间距更近。这使声波能够在更短的时间间隔内实现更高分辨率的测量。声波测井波形也可以与反射面地震类似的方式处理以得到反射信息。因此，它的较高频率源可以提供距离井口数十英尺的更高分辨率的反射信息。来自先导和水平测井的结构倾角计算与声波反射相关联，以标记可能的断层位置并构造地质剖面，用于定义不同的油藏。沿井眼轨迹相交的地层。通过利用声波波形将给定储层内的构造线（断层和断裂带）延伸到远离井眼的位置。由于断层位移小（<4 m），该断层不是在地表地震中非原始拾取的，但是将其解释叠加在属性上表明arnfault的可能性。随后通过注射轮廓验证了结果。绘制这些构造线可以改善地震解释，最终导致更好的井位布置并验证现有的动态数据。

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