玉北地区碳酸盐岩缝洞型储层精细成像方法应用研究

针对新疆塔里木盆地玉北地区目标储层埋藏深、非均质性强以及地震资料信噪比低、波场复杂的特点,以逆时叠前深度偏移成像为核心、深度域速度建模为关键、保真的弱信号补偿为基础,建立了一套面向玉北碳酸盐岩缝洞型储层的高精度地震成像技术流程。将该技术流程应用于玉北6井区474 km2实际三维地震资料处理,所得结果与传统叠前时间偏移结果对比分析表明,该技术流程对于复杂构造带成像、“串珠”成像、缝洞储层刻画等具有明显的优势,有效提高了研究区奥陶系碳酸盐岩缝洞型目标储层的成像精度。

The target reservoir of Yubei area in the Tarim Basin has complex characteristics,including deep buried,strong heterogeneity,complex reflected wavefield and low signal-to-noise ratio for seismic data.In view of this,we created a high resolution reverse time migration imaging technical workflow for Yubei fractured-vuggy carbonate reservoir based on depth domain velocity model building and high fidelity weak signal compensation.We applied the technology on an area of 474 km2 3D seismic data in Yubei 6 well region.Compared with the conventional prestack time migration,our technique technology has obvious advantages in the complicated structure imaging,“moniliform” imaging and fractured-vuggy reservoir characterization,and effectively improve the imaging precision of Ordovician fractured-vuggy carbonate target reservoir.