济阳坳陷陆相断陷湖盆页岩油油气资源丰富,勘探开发潜力巨大,裂缝发育,在钻井过程井涌井漏频发,严重影响了钻井效率,亟须提高裂缝预测的准确率。为此,利用动态时间规整算法计算整数时移,校正叠前道集中的残余各向异性时差,提高地震资料的分辨率,并基于地震纵波在各向异性介质中传播引起的时差,确定方位各向异性和相对强度,最终确定裂缝的发育方向和发育密度。该方法不依赖椭圆拟合,直接将各向异性时差看作整数时移的数据匹配问题,相比商业软件中的叠前各向异性反演模块,有效解决了裂缝预测多解性的问题。预测结果在与实钻井的成像测井解释结果以及钻井过程中的钻速异常和涌漏位置对比分析中,预测准确率达到85%,证明该方法预测裂缝的可靠性高。该预测方法可以为页岩油的高效开发提供有力的技术支持。
The continental faulted lake basin in Jiyang Depression is rich in shale oil and gas resources,with great potential for exploration and development and developed fractures.However,due to the development of fractures,frequent well kicks and lost circulation during drilling seriously affect the drilling efficiency,and it is urgent to improve the prediction accuracy of fractures.To address of this issue,the dynamic time warping algorithm is used to calculate the integer time shift,correct the residual anisotropic time difference in the prestack gather,and improve the resolution of the seismic data.Based on the time difference caused by the propagation of the seismic longitudinal wave in the anisotropic medium,the azimuthal anisotropy direction and relative intensity are determined,and finally the development direction and development density of the fracture are determined.This method does not rely on ellipse fitting, and directly regards the anisotropic time difference as the data matching problem of integer time shift.Compared with the pre-stack anisotropic inversion module in commercial software,it effectively solves the problem of multiple solutions of fracture prediction.The prediction results are compared with the imaging logging interpretation results of real drilling and the abnormal drilling speed and the location of gushing and leaking in the drilling process.The prediction rate reaches 85%,which proves that the method has high reliability in predicting fractures.This prediction method can provide strong technical support for the efficient development of shale oil in the future.
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