非常规/复杂油藏

地震后处理克服了埃及近海油田的不确定性

本文的作者描述了埃及油田的地震再处理活动，该活动产生的地震数据较差。

新深度 CRAM 切片（左）与传统深度 Kirchhoff 各向同性图像（右）。 带有新 PSDM 数据的新 CRAM 图像显示出高而强的振幅，向该区域的北部和西部部分延伸。
图 1——新深度 CRAM 切片（左）与传统深度 Kirchhoff 各向同性图像（右）的对比。带有新 PSDM 数据的新 CRAM 图像显示出高而强的振幅，向该区域的北部和西部部分延伸。
资料来源：SPE 214066。

ASH油田位于埃及AG盆地东部。下白垩统 Alam El Bueib 是主要产油层。由于Abu Roash序列的非均质性较高，加之上白垩统厚层灰岩的影响以及多条复杂断层的影响，地震资料质量很差，需要进行地震再处理。为了实现这一目标，采用了两项关键技术：获取新的垂直地震剖面（VSP）井数据来调整速度模型，并使用共同反射角偏移（CRAM）叠前深度偏移（PSDM）进行再处理。

介绍

ASH 油田从 Aptian 下白垩统油藏中生产石油。

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Unconventional/complex reservoirs

Seismic Reprocessing Overcomes Uncertainty in Offshore Egyptian Field

The authors of this paper describe a seismic reprocessing campaign for an Egyptian oil field that had yielded poor seismic data.

New depth CRAM slice (left) vs. legacy depth Kirchhoff isotropic image (right). The new CRAM image with new PSDM data showed high and strong amplitude extending toward the north and west portions of the field.
Fig. 1—New depth CRAM slice (left) vs. legacy depth Kirchhoff isotropic image (right). The new CRAM image with new PSDM data showed high and strong amplitude extending toward the north and west portions of the field.
Source: SPE 214066.

The ASH oil field is in the eastern portion of the AG Basin in Egypt. The Lower Cretaceous Alam El Bueib is the main oil-producing formation. Because of the high heterogeneity of the Abu Roash succession, in addition to the influence of thick limestone of the Upper Cretaceous and the influence of multiple complex faults, the quality of seismic data is very poor, requiring seismic reprocessing. Two key techniques were used to achieve the goal: New vertical seismic profile (VSP) well data were acquired to adjust the velocity model, and common reflection angle migration (CRAM) prestack depth migration (PSDM) was used for reprocessing.

Introduction

The ASH field produces oil from the Aptian Lower Cretaceous reservoir.

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