叠前深度偏移技术在复杂断块井位目标优化中的应用

摘要/Abstract

摘要： 川东地区云安厂构造带断块发育，构造狭窄，钻井揭示实际地层的构造轴线与叠前时间偏移结果存在较大的偏差。通过使用Kirchhoff叠前深度偏移技术，建立精准的速度—深度模型，优选合理的偏移孔径，对该区进行了叠前深度偏移处理。叠前深度偏移剖面上构造形态特征明显，大断层边界清晰，断点位置准确可靠，大大提高了目的层的成像精度。利用钻井和测井资料对叠前深度偏移成像的深度进行精细的标定和校正，根据叠前深度偏移成果修改构造图件，据此指导钻井下一步的钻探目标。调整目标后的钻井结果与叠前深度偏移构造要素相吻合,为后续的井位目标优化提供了有价值的参考。

关键词: 复杂构造；层速度；叠前深度偏移；速度&mdash, 深度模型；构造形态畸变

Abstract: Faulted blocks developed in the narrow Yunanchang structure in East Sichuan Basin. The drilling results show a substantial deviation between structural axis and pre-stack time migration. With the Kirchhoff pre-stack depth migration technology used, the accurate velocity-depth model is established, while reasonable migration aperture is chosen, to make PSDM in this region. The characteristics of structural shape and boundaries of main faults are clear on the PSDM profile while the breakpoints of faults are reliable and accurate, significantly improving imaging resolution of the target layers. Drilling and logging data are used to accurately calibrate and correct the PSDM imaging depth. The structural map is revised on the basis of the PSDM results, thus identifying the next drilling target. The drilling results after adjustment of target are in line with the PSDM structural elements, providing valuable references for optimization of the follow-up well location targets.

徐敏, 杨晓, 王静, 游浩, 王兰英. 叠前深度偏移技术在复杂断块井位目标优化中的应用[J]. 中国石油勘探, 2015, 20(3): 73-78.

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