The Role of Salt Dome Characterization in Developing Salt Caverns for Underground Hydrocarbon Storage: A First Case Study in UAE
Notice bibliographique
Résumé
Abstract Salt dome characterization is essential for underground hydrocarbon storage, as it aids in identifying suitable zones for leaching, ensuring cavern integrity, and optimizing storage capacity. The objective of this study is to implement a comprehensive characterization of salt formations to enhance the understanding of their behavior and suitability for hydrocarbon storage. Historically, the first salt caverns for hydrocarbon storage were developed in Canada in the early 1940s, followed by numerous projects in the USA and recently expansion into new areas globally. This paper presents the first case study in the UAE focusing on salt caverns intended for oil storage. To achieve the project's objectives, two caverns were drilled, and fully oriented cores were collected, encompassing the entire salt section, including insoluble zones. Conventional mud logging, along with a comprehensive suite of logs, was performed to ensure proper salt dome characterization and optimize the selection of leaching intervals for cavern creation. Routine core analysis and extensive geomechanical core assessments were conducted to understand the behavior of the salt rock, complemented by detailed core descriptions to define various salt facies. Advanced technologies, including walk-away seismic measurements, far-field acoustic measurements, and electromagnetic propagation wave technologies, were employed to delineate the extension of the salt dome. Preliminary classifications of salt facies were conducted during coring using core chip descriptions and drilling cuttings from mud logging data. These salt facies were refined through detailed core descriptions and integration with additional analyses, such as CT scan, thin sections, scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray fluorescence (XRF). An integrated salt study utilizing Quad-Compo data, imaging logs, spectroscopy, mini-fracture tests, and core analyses led to the identification of numerous salt bodies interbedded with various insoluble formations. These salt bodies were ranked to optimize leaching intervals for cavern creation based on criteria such as salt purity, halite percentage, thickness, evidence of fractures, lateral extension, and measured porosity and permeability from routine core analysis and geo-mechanical studies. The lateral extension of the salt dome was further assessed using advanced tools, such as walk-away seismic surveys, deep shear acoustic waves, and three-dimensional borehole electromagnetic waves, which confirmed the absence of faults or fractures near the selected leaching intervals. Ultimately, this comprehensive dataset supports critical cavern design parameters, including height, width, leaching intervals, and storage capacity calculations. This integrated study, encompassing extensive data gathering and analysis, will serve as a benchmark for upcoming salt cavern projects. Notably, this endeavor is considered a pilot project in the region for salt dome characterizations and provides insights into the optimal development of salt caverns for underground hydrocarbon storage.
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