通过对复杂地质/构造的建模,对储层裂缝域的认识——以巴基斯坦Potwar盆地Ratana油田为例

J. Wrobel-daveau, Rodney Barracloughy, Sarah Laird, Nicholas Matthies, Bilal Saeed, Khalid Shoaib, Zaheer Zafar
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引用次数: 3

摘要

在像Potwar石油省这样的褶皱冲断带,勘探成功与否受到地震成像挑战和构造复杂性的影响。成功与否在一定程度上取决于验证地下模型和一系列属性(如储层渗透率)的能力。对于始新世Sakesar组等致密碳酸盐岩储层来说,这一点尤为重要,因为在这些储层中,经济数量的油气采收率取决于裂缝增强渗透率的存在。这就需要应用地质和地球物理建模技术来应对这些挑战,以最大限度地减少不确定性,并推动勘探成功。本文介绍的Ratana构造的解释和结构验证允许在数据不确定性较高的区域(如沿断层)提出一致且稳健的结构模型。为Sakesar油藏创建的动态更新、水密、复杂的3D结构框架与辅助断层解释算法相结合,用于表征断层和裂缝模式。结果表明,高振幅断裂的密度在结构的侧翼,而不是沿铰链方向。基于结构运动演化的增量应变模型支持了上述结果。总的来说,这有助于在地震区描述潜在的裂缝走廊,这些区域以前被证明对人工驱动的解释具有挑战性。我们的研究结果使我们能够减少与储层几何特征相关的不确定性,并为潜在的勘探目标提供见解,以最大限度地提高成功的机会,这表明渗透率和油气流量可能在Ratana构造的边缘处更高,而不是在顶部,这是之前勘探和生产工作的重点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Insights on Fractured Domains in Reservoirs Resulting from Modeling Complex Geology/Structures - Case Study of the Ratana Field in the Potwar Basin, Pakistan
Exploration success in fold-and-thrust belts, like the Potwar petroleum province, is impacted by seismic imaging challenges and structural complexity. Success partly relies on the ability to validate subsurface models and model a range of properties, such as reservoir permeability. This is particularly important in the case of tight carbonate reservoirs such as the Eocene Sakesar Formation, where the recovery of economic quantities of hydrocarbons is conditioned by the presence of fracture-enhanced permeability. This requires the application of geological and geophysical modeling techniques to address these challenges, to minimize uncertainty and drive exploration success. The interpretation and structural validation of the Ratana structure presented here allows the proposal of a consistent and robust structural model even in areas of higher uncertainty in the data, such as along faults. The dynamically updatable, watertight, complex 3D structural framework created for the top Sakesar reservoir was used in combination with an assisted fault interpretation algorithm to characterize the fault and fracture pattern. The results showed a higher density of high amplitude fractures on the flanks of the structure rather than along the hinge. These results are supported by the incremental strain modeling based on the kinematic evolution of the structure. Together, this helped to characterize potential fracture corridors in areas of the seismic volume that previously proved challenging for human driven interpretation. Our results allow us to reduce the uncertainty related to the geometrical characteristics of the reservoir and provide insights into potential exploration well targets to maximize chances of success, suggesting that permeability and hydrocarbon flow may be higher at the margins of the Ratana structure, and not at the crest, which was the focus of previous exploration and production efforts.
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