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3D-3C Multicomponent Seismic - A successful fracture characterization case study in Algeria

机译：3D-3C多分量地震-阿尔及利亚成功的裂缝表征案例研究

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Multi-component acquisition has been used in the industry for many years for fracture density and orientation studies with proven success. In the field under study, it has been observed from well information at target level that there is a relationship between gas production and natural fractures, faults, and changes in facies. The target horizon located at a depth of approximately 1950 m is composed of low-porosity gas-bearing Ordovician sandstones of 5 to 6% average porosity. The Ordovician is characterized by a highly heterogeneous matrix affected by natural fractures. This paper describes a 3D multi-component land seismic project conducted in Algeria, designed to perform a fracture characterization study. This pilot survey, acquired in 2010 over the Tin Fouyé Tabankort West block, is the first land 3D-3C acquisition ever performed in Algeria. It covers an area of about 67 km~2 centered on a well location. The following project phases will be described hereafter: (1) 3D-3C survey design and field operations, (2) Main steps of the PP and PS-wave pre-processing sequences, (3) PP and PS-wave interpretation study at deep levels made possible by the cleaned and signal-preserved seismic data. The resulting PP seismic dataset from the 3D-3C survey provides a better resolution of subtle faults and lineaments than the conventional 3D acquired in 2003 and reprocessed in 2010, even though the noise level remains slightly high. Furthermore, PS seismic data shows evidence of azimuthal anisotropy in relation to the faults and lineaments interpreted on the PP dataset. Anisotropy analysis results tie reasonably well with FMI information available in the Ordovician, showing great potential for using this technology for fracture studies.
机译：多组分采集已在行业中用于裂缝密度和方向研究多年，并获得了成功的证明。在所研究的领域中，从目标水平的井信息中观察到，天然气产量与自然裂缝，断层和相变化之间存在联系。位于约1950 m深度的目标层位由平均孔隙度为5％至6％的低孔隙度含气奥陶纪砂岩组成。奥陶纪的特征是受自然裂缝影响的高度非均质基质。本文介绍了在阿尔及利亚进行的3D多分量陆地地震项目，旨在进行裂缝特征研究。这项试验性调查于2010年在TinFouyéTabankort West区块上进行，是阿尔及利亚有史以来的首次3D-3C陆地采集。它以一个良好的位置为中心，覆盖约67 km〜2的面积。以下将描述以下项目阶段：（1）3D-3C勘测设计和现场操作，（2）PP和PS波预处理序列的主要步骤，（3）深层PP和PS波解释研究通过清理和保留信号的地震数据可以达到最高水平。 3D-3C勘测产生的PP地震数据集提供了比2003年采集并于2010年重新处理的常规3D更好的细微断层和构造的分辨率，即使噪声水平仍然很高。此外，PS地震数据显示了与PP数据集上解释的断层和构造有关的方位各向异性。各向异性分析结果与奥陶纪可获得的FMI信息相当吻合，显示出将该技术用于裂缝研究的巨大潜力。

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