Igneous rocks in the South China Sea have broad prospects for oil and gas *** geophysical methods are important approaches to study the distribution of igneous rocks and to determine and identify igneous rock *** at t...
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Igneous rocks in the South China Sea have broad prospects for oil and gas *** geophysical methods are important approaches to study the distribution of igneous rocks and to determine and identify igneous rock *** at the characteristics of gravity and magnetic fields in the South China Sea,several potential field processing methods are preferentially *** to the pole by variable inclinations in the area of low magnetic latitudes is used to perform reduction processing on magnetic *** preferential continuation method is used to separate gravity and magnetic anomalies and extract the gravity and magnetic anomaly information of igneous rocks in the shallow part of the South China *** 3D spatial equivalent distribution of igneous rocks in South China Sea is illustrated by the 3 D correlation imaging of magnetic *** the local anomaly boundaries are highlighted gravity and magnetic gradients,the distribution characters of different igneous rocks are roughly outlined by gravity and magnetic correlation analysis weighted by *** results show the distribution of igneous rocks is controlled and influenced by deep crustal structure and faulting.
In order to eliminate the effect of ocean bottom topography on seismic wave field,we transformed curved（x,z）coordinate system grids into rectangular（ξ,η）coordinate system grids and derived a 2-D scalar acoustic ...
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In order to eliminate the effect of ocean bottom topography on seismic wave field,we transformed curved（x,z）coordinate system grids into rectangular（ξ,η）coordinate system grids and derived a 2-D scalar acoustic wave equation in theξ,η*** seismic wave field collected at the sea surface was downward continued to the ocean bottom by the inverse finite difference method with the water velocity and then was reversely continued to the ocean surface by the finite difference method using the layer velocity from just below the ocean bottom in the（ξ,η）*** calculations and practical application show that this method can not only remove the reflection travel time distortion but also correct the dynamic parameter changes caused by the ocean bottom *** inverted velocity after wave field continuation is much more accurate than before continuation and the image section was greatly improved compared to the original wave field.
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