This paper introduces a gravity regional interpretation workflow for mapping the natural fracture system, a challenge in unconventional reservoir exploration. The workflow comprises coupling two gravity data attributes, the tilt angle and the multiscale edge detection (worming), to build a high-resolution image structural framework of a given basin’s basement. That includes a description of the fault directions and fault density, consolidated in a fault distribution map. The proposed workflow was applied to available gravity data of a representative passive-margin basin, the Sergipe-Alagoas Basin, Brazil. The source rocks of Sergipe-Alagoas are organic-rich shale deposited in the principal depocenters during the rift phase of the basin’s evolution. These shaly units are the unconventional reservoirs in the basin. These organic-rich shales are acknowledged as syn-rift unconventional reservoir analogs of all Brazilian continental margin basins and many other passive-margin basins worldwide. The workflow recognized two fault trends in the studied area. A principal NE–SW and a minor NW–SE. 3D seismic interpretation validated the proposed workflow by successfully associating the gravity faults with traditional fault attributes. One advantage of this workflow is that it can be implemented over broad regions at a minimum expense. The proposed method can be used to rank opportunities in unconventional exploration.

本文介绍了一种用于绘制天然裂缝系统的重力区域解释工作流程，这是非常规储层勘探中的一个挑战。该工作流程包括耦合倾斜角和多尺度边缘检测（蠕虫）两个重力数据属性，以构建给定盆地基底的高分辨率图像结构框架。其中包括对断层方向和断层密度的描述，并整合到断层分布图中。建议的工作流程应用于巴西塞尔吉比-阿拉戈斯盆地具有代表性的被动边缘盆地的可用重力数据。Sergipe-Alagoas 的烃源岩是在盆地演化的裂谷阶段沉积在主要沉积中心的富含有机质页岩。这些页岩单元是盆地内的非常规油气藏。这些富含有机质的页岩被认为是巴西所有大陆边缘盆地和世界上许多其他被动边缘盆地的同裂谷非常规储层类似物。工作流识别出研究区域中的两种故障趋势。主要的 NE-SW 和次要的 NW-SE。3D 地震解释通过成功地将重力断层与传统断层属性相关联来验证所提出的工作流程。此工作流程的一个优点是它可以以最低的成本在广泛的区域实施。所提出的方法可用于对非常规勘探中的机会进行排序。3D 地震解释通过成功地将重力断层与传统断层属性相关联来验证所提出的工作流程。此工作流程的一个优点是它可以以最低的成本在广泛的区域实施。所提出的方法可用于对非常规勘探中的机会进行排序。3D 地震解释通过成功地将重力断层与传统断层属性相关联来验证所提出的工作流程。此工作流程的一个优点是它可以以最低的成本在广泛的区域实施。所提出的方法可用于对非常规勘探中的机会进行排序。