Calculation of the 3D Density Model of the Earth’s Crust in the Sea of Okhotsk

The paper considers the results of calculation of the three-dimensional density model of the Earth’s crust for the territory of the Republic of Niger in conditions of incomplete initial geological and geophysical information. A brief description of the geological structure of the research region is given and the task of the study is formulated. The initial data set of density modeling is described, including: the anomalous gravity field, the initial model of the medium, the constraints on the desired solution, and the weight functions of redistribution of field incompatibilities. Inversion of the anomalous gravity field was performed in a three-dimensional formulation for a regular grid with a 25×25 km spacing in the plan and 14 layers of irregular vertical grid. The density model of the crystalline crust obtained by solving the inverse problem was combined with a priori data on the density of the upper mantle layer and the previously constructed layered model of the sedimentary cover of the region. The main features of the density model of the Earth’s crust are considered and its density heterogeneities are compared with the regional geological and tectonic data. The leading role of young structures of the West African rift System and their relationship with density inhomogeneities in the lower and middle crust of the territory of the Republic of Niger was noted.

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Integrated Seismic and Density Model of the Earth's Crust and Upper Mantle Beneath the LT-7 and TTZ DSS Profiles, Poland

61st EAGE Conference and Exhibition ◽

10.3997/2214-4609.201407986 ◽

1999 ◽

Author(s):

E. Kozlovskaya ◽

J. Yliniemi

Keyword(s):

Upper Mantle ◽

Earth’S Crust ◽

Density Model ◽

Crust And Upper Mantle ◽

Earth's Crust

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Methodological and technological aspects of exeption of the gravitational effect of the lower part of the earth's crust in study of sedimentary cover of oil and gas-bearing areas

Geoinformatika ◽

10.47148/1609-364x-2020-3-38-45 ◽

2020 ◽

pp. 38-45

Author(s):

V.A. Spiridonov ◽

◽

N.N. Pimanova ◽

Keyword(s):

Gravitational Field ◽

Oil And Gas ◽

Sedimentary Cover ◽

A Priori ◽

Sedimentary Basins ◽

Gravitational Effect ◽

Earth’S Crust ◽

Density Model ◽

Crust And Upper Mantle ◽

Earth's Crust

In the case of seismic density modeling of sedimentary basins, it is necessary to exclude from the observed gravitational field the effect created by inhomogeneities of the lower part of the crustal section. The article offers one of the approaches to the geological field reduction, implemented through the construction of a 3D density model for the entire thickness of the earth's crust and upper mantle. A fragment within the study area is selected from the constructed 3D model and its gravitational effect is calculated. Various options for implementing this approach are considered, depending on the amount of a priori information. The technological base of the method is GIS INTEGRO. Keywords: Gravitational field, geologic reduction, density model, GSS profiles, inversion, structural framework of the model.

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Three-dimensional density model of the Earth's crust and the upper mantle for the area of Poland

Journal of Geodynamics ◽

10.1016/s0264-3707(97)00001-x ◽

1998 ◽

Vol 25 (1-2) ◽

pp. 5-34 ◽

Cited By ~ 31

Author(s):

T. Grabowska ◽

G. Bojdys ◽

J. Dolnicki

Keyword(s):

Upper Mantle ◽

Three Dimensional ◽

Earth’S Crust ◽

Density Model ◽

Earth's Crust

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Seismic Density Model of the White Sea’s Crust

Geosciences ◽

10.3390/geosciences10120492 ◽

2020 ◽

Vol 10 (12) ◽

pp. 492

Author(s):

Boris Belashev ◽

Lyubov Bakunovich ◽

Nikolai Sharov ◽

Michail Nilov

Keyword(s):

Gravity Field ◽

Oil And Gas ◽

White Sea ◽

Deep Structure ◽

Earth’S Crust ◽

Density Model ◽

The White Sea ◽

Software Complex ◽

Moho Boundary ◽

Earth's Crust

Study of the deep structure of the White Sea region is relevant to active geodynamics, manifestations of kimberlite magmatism, and the prospects of oil and gas searches. The aim of this work was to model the velocity and density structure of the earth’s crust in the White Sea region. Modelling was carried out using the known data of instrumental observations and the software complex “Integro”. With the help of 2D models based on deep seismic sounding (DSS) profiles and a digital map of the anomalous gravity field, the density structures of local areas of the region’s crust were refined. A 3D density model was built. Within the framework of this model, the positions of the density layers were determined. The relief of the Mohorovichich (Moho or M) discontinuity reflects the anomalies of the gravity field. Depression of the Moho boundary in the bottleneck of the White Sea indicates the vertical structure of the earth’s crust associated with manifestations of kimberlite magmatism.

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