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库车山前带发育第四系和新近系两套砾岩,第四系砾岩主要发育于冲积平原沉积体系,新近系砾岩主要发育于冲积扇沉积体系.不同时期不同沉积体系下的砾岩组合在一起表现为垂向上具有多期叠置性,横向上沉积范围局限具有不连续性.空间岩性的巨大变化给库车山前带的精细速度建场带来很大困难,导致构造落实非常困难.非地震电阻率数据能够清晰反映两套砾岩层的空间轮廓分布特征,测井数据能够反映砾岩垂向的多期叠置特征,地震数据不能反映砾岩的形态特征,但是能够反映正常地层的格架特征.通过把地震数据与电阻率数据进行融合,在融合体上进行联合构造解释,建立了不同岩性的精细层序地层格架模型,利用此模型对地震波阻抗反演进行约束,反演得到纵波速度体.利用该速度体作为叠前深度偏移处理的初始速度模型,通过反复迭代,建立了最终的叠前深度偏移速度场,较为可靠的落实了库车地区的圈闭形态、高点位置和埋深.
The Kuqa piedmont belt developed two sets of conglomerate, and the Quaternary conglomerate mainly developed in the alluvial plain sedimentary system, and the New Member conglomerate mainly developed in the alluvial fan depositional system. The gravels under different depositional systems in different periods The rock assemblages are characterized by multi-period superimposition in the vertical direction and discontinuity in the lateral extent of sedimentation. The great change of lithology of the space brings great difficulty to the fine velocity formation in the fore belt of the Kuqa area, Non-seismic resistivity data can clearly reflect the spatial distribution characteristics of two conglomerate layers. Log data can reflect the vertical multistage superimposition of conglomerate. Seismic data can not reflect the conglomerate’s morphological characteristics, but can reflect The geostrophic features of the normal stratigraphy are illustrated by the fusion of the seismic data and the resistivity data, the joint structure interpretation on the fusion body, the establishment of the fine sequence stratigraphic framework model with different lithologies, and the seismic impedance inversion Constraint, and inversion of P-wave velocity body.Using the velocity body as the initial velocity model for pre-stack depth migration processing, the final prestack depth Migration velocity field, the more reliable the implementation of the trap shape, high position and depth of Kuqa region.