井约束旅行时恒定层析成像技术在南川地区的应用

doi:10.13809/j.cnki.cn32-1825/te.2021.04.006

摘要/Abstract

摘要：

川东南地区地形高差大,地表条件复杂,同时地层倾角大,地下条件复杂,精确成像难。该地区前期处理资料在页岩气勘探开发支撑中存在井震波组产状不一致、断层假象及井震预测误差的问题。针对该地区存在的问题,研究了井控各向异性叠前深度偏移方法,并应用于上述三维工区,通过提高速度模型精度从而提高复杂褶皱区的地震成像精度,对指导后期的井位部署及水平井导向,提高优质页岩钻遇率起到重要的作用。从各向同性和各向异性两个方面对偏移速度模型精度进行了精细刻画,通过高精度网格层析速度建模、井约束旅行时恒定层析成像技术（TPT）、TTI（具有倾斜对称轴的横向各向同性介质）各向异性成像技术的深入研究及实践,逐步健全了川东南地区地震精确成像的关键技术系列,提高了井震产状吻合度,缩小了井震深度预测误差,消除了地震剖面的断层假象,为后续页岩气勘探开发部署提供了重要技术支撑。

关键词: 网格层析, 各向异性, TPT, TTI各向异性成像, 南川地区

Abstract:

The southeastern Sichuan region has large elevation differences, complex surface conditions, large stratum dip, and complex conditions underground, so that the accurate imaging is difficult. In the support of shale gas exploration and development, there are problems of inconsistent well seismic wave group occurrence, false faults and well seismic prediction errors for the pre-processed data in this area. Aiming at these problems, the well-control anisotropic pre-stack depth migration method is proposed and applied to the above three-dimensional work area. By improving the accuracy of the velocity model, the seismic imaging accuracy of the complex fold area is improved, and it plays an important role in guiding the later well position, and improving the high-quality shale drilling rate. In this paper, the accuracy of the migration velocity model is finely characterized from two aspects: isotropy and anisotropy. Through the deep research and practice of high-precision grid tomography velocity modeling, travel（TPT）and TTI（transverse isotropic media with axial inclined symmetry）, the key technology series of seismic precision imaging in southeast Sichuan is gradually improved to enhance the well seismic yield consistency, reduce the well earthquake depth prediction error, eliminate the fault illusion of seismic profile, and provide important technical support for subsequent exploration and development of shale gas deployment.

Key words: grid tomographic, anisotropy, TPT, TTI anisotropic imaging, Nanchuan area

中图分类号:

TE132

杨帆,蓝加达,孟庆利,薛野,李彦婧,赵苏城,俞若水,纪明,姜岸,任俊兴. 井约束旅行时恒定层析成像技术在南川地区的应用[J]. 油气藏评价与开发, 2021, 11(4): 514-520.

YANG Fan,LAN Jiada,MENG Qingli,XUE Ye,LI Yanjing,ZHAO Sucheng,YU Ruoshui,JI Ming,JIANG An,REN Junxing. Application of well-constrained travel time preserving tomography technology in Nanchuan area[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(4): 514-520.

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