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Effi cient modeling of the gravity anomaly caused by a sedimentary basin with lateral variable density contrast and its application in basement relief estimation

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Applied Geophysics 2021年第2期18卷 145-158,272页

作者： Feng Xu-Liang Liu Sheng-Rong Shen Hong-Yan School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’an 710065China Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi’an Shiyou UniversityXi’an 710065China Xi’an Center of Geological Survey(Northwest China Center for Geoscience Innovation) Xi’an 710054China

The forward calculation of gravity anomalies is a non-negligible aspect contributing to the time consumption of the entire process of basement relief *** this study,we develop a fast hybrid computing scheme to compute the gravity anomaly of a *** use the vertical prism source equation in a given region R centered at a certain gravity observation point and the vertical line source equation outside R to derive the gravity *** observe that the computation with the vertical line source equation is much faster than that of the vertical prism source equation,but the former is slightly ***,our method is highly effi cient and able to avoid the errors caused by the low accuracy of the vertical line source equation near the observation *** then derive the general principle of choosing the size of R via a series of prism model *** tests on the gravity anomaly over the Los Angeles Basin confirm the correctness of our proposed forward *** modify Bott’s method with an accelerating factor to expedite the inversion procedure and presume that the density contrast between the sediments and the basement in a sedimentary basin varies laterally and can be obtained using the equivalent *** data and real data applications in the Weihe Basin illustrate that our proposed method can accurately and effi ciently estimate the basement relief of sedimentary basins.

关键词： gravity anomaly basement relief fast forward inversion lateral variable density contrast

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