Analysis of the capabilities of marine electrical exploration technologies in solving problems of prospecting and monitoring oil and gas fields using 3D modeling and geometric 3D inversion
DOI:
https://doi.org/10.21638/spbu07.2024.204Abstract
The possibilities and comparative analysis of marine electrical exploration technologies for solving problems of hydrocarbon search and monitoring of oil-water contact are presented. The studies were carried out using a 3D modeling and geometric 3D inversion. The 3D modeling method is based on a special mathematical formulation with two-stage primary-secondary field approach and finite element approximation using vector basis functions. The 3D geometric inversion method is aimed at maximizing the accuracy of determining the boundaries of target objects. We consider a new technology for electrical prospecting, which is implemented in start-stop mode and make measurements in the time domain. This technology includes an eight-arm receiver located on the seabed and two sources in the form of horizontal electric dipoles, which can be located either on the seabed or at the surface of the water. It is shown that this technology makes it possible to obtain a significantly larger absolute and relative signal from a deep-lying object of increased resistivity compared to technologies in which the field is excited and received either by horizontal or vertical lines. For technology with an eight-arm receiver, we analyze the error in determining the oil-water contact and equivalence. It is shown that in the case of sufficient sensitivity of signals to the presence of a deep target object, the position of its boundaries can be determined with an accuracy of no worse than 200 m for a target depth of 2.5 km if the contrast in the resistivity of the object to the background medium is sufficient. It is also shown that the position of the oil-saturated zone boundary is determined by the change of sign between negative and positive extrema in the deviations of signals obtained when this boundary is displaced during oil production, and the resistivity of the area remaining after the displacement of the main volume of oil is determined by the level of these extrema. This, in turn, opens up prospects for using this technology in solving problems of monitoring the boundary of the oil-saturated zone during the development of offshore oil fields.
Keywords:
marine electrical exploration, hydrocarbon prospecting, monitoring, 3D modeling, 3D inversion
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