公开(公告)号：US20170276813A1

公开(公告)日：2017-09-28

申请号：US15078020

申请日：2016-03-23

Applicant: CHEVRON U.S.A. INC.

Inventor： Yonghe J. SUN ,  Craig S. HUBER

IPC: G01V1/28

CPC classification number: G01V1/303

Abstract: A method for seismic imaging of a subsurface volume of interest may include an imaging technique such as reverse time migration which uses a conditioned velocity model that replaces at least one sharp velocity transition with a gradual velocity transition including a velocity overshoot layer. The method may be performed by a computer system.

公开(公告)号：US20170010374A1

公开(公告)日：2017-01-12

申请号：US15191670

申请日：2016-06-24

Applicant: CHEVRON U.S.A. INC.

Inventor： Yonghe J. SUN ,  Weihong FEI ,  Craig A. BARKER

IPC: G01V1/30 ,  G01V1/36

CPC classification number: G01V1/306 ,  G01V1/36 ,  G01V2210/6161 ,  G01V2210/6226 ,  G01V2210/641

Abstract: A method is described for seismic imaging of complex subsurface volumes using prismatic seismic energy. The method receives a seismic dataset and an earth model. The earth model is perturbed such that prismatic reflections will generate perturbed seismic amplitudes in a target area and seismic imaging is performed using the perturbed model. A second seismic image is generated using a second earth model; the second earth model may be the original earth model or a second perturbed model wherein the perturbation generates different seismic amplitudes in the target area. The two seismic images are differenced to generate a prismatic seismic image that can be used to identify geologic features that are poorly illuminated in conventional imaging. The method may be executed by a computer system.

Abstract translation: 描述了使用棱柱形地震能量对复杂地下体积的地震成像进行的一种方法。 该方法接收地震数据集和地球模型。 地球模型受到扰动，使得棱镜反射将在目标区域中产生扰动的地震振幅，并且使用扰动模型进行地震成像。 使用第二地球模型生成第二地震图像; 第二地球模型可以是原始地球模型或第二扰动模型，其中扰动在目标区域中产生不同的地震幅度。 两个地震图像是不同的，以产生可用于识别在常规成像中较差照明的地质特征的棱镜地震图像。 该方法可以由计算机系统执行。