Abstract
The goal of this paper is to improve the capability of gravity inversion assessment of complex structures using a multiple-source model as indicated by a study of a foothill belt of northwestern Taiwan. In this study, a gravity inversion computer program is applied based on research developed by Tsai, which contains a Marquardt inversion algorithm for mathematical calculations and incorporates constraints on geological parameters. The computed and modified geological parameters are transformed into coordinates. The response of a proper geological model is calculated using the Talwani technique. The method is applied to a field example in a foothills belt of Taiwan that possesses complex subsurface structures. The density profile from 2D gravity data, obtained using our inversion computer program, reveals a good correlation with the geological model obtained from seismic, borehole, and geologic data. Furthermore, potential hydrocarbon traps associated with some of the interpreted geological structures (where no seismic data are available) in the eastern and western seismic sections are being evaluated and assessed for possible future development. This profile highlights features that are important to a good understanding of an area with complex subsurface structures. It also helps to define subsurface geology and assess potential hydrocarbon traps. This
Highlights
Two-dimensional (2-D) gravity inversion has been used for many years to automatically interpret gravity data (Corbato 1965; Bott 1967; Tanner 1967; Negi and Garde 1969; Al-Chalabi 1972; Dyrelius and Vogel 1972; Pedersen 1975; Enmark 1981; García-Abdeslem 2003)
This study illustrates the application of gravity data to in-depth detection and delineation of subtle faulting and anticlines in a foothill belt
The results were achieved by applying a multiple-source model inversion method to the gravity data of the foothill belt portion of Hsinchu to Taoshan villages
Summary
Two-dimensional (2-D) gravity inversion has been used for many years to automatically interpret gravity data (Corbato 1965; Bott 1967; Tanner 1967; Negi and Garde 1969; Al-Chalabi 1972; Dyrelius and Vogel 1972; Pedersen 1975; Enmark 1981; García-Abdeslem 2003). Tsai (1992) has studied the Colorado plateau west of the Albuquerque basin In his research, he extensively modified a conventional two-dimensional gravity inversion program using multiple bodies incorporating real geological constraint such as depth, dip angles, fault throws, and densities. The Root Mean Square Error (RMSE) limits were less than 1 mGal. In addition, the method applied to an inverted density model from the field data of the Albuquerque basin in New Mexico, USA was geologically reasonable. A gravity inversion-modeling program is developed here based on Tsai’s 1992 study This program is used to study complex subsurface geological structures in a foothills belt of northwestern Taiwan. The features of the algorithm used include an allowable variety of geological constraints such as bed densities, depths and dips, and fault locations and dips. Parameterization incorporating geological constraints and working with general multiple-source models is applied to improve the quality of the inversion results
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