Igneous rock reservoir prediction method based on association of magnetic force data, earthquake data and well drilling data

Abstract

The invention provides a method utilizing magnetic force data, earthquake data and well drilling data comprehensively for igneous rock reservoir prediction. According to the invention, igneous rock recognition can be realized through reasonable utilization of magnetic force and the shortcoming of insufficient spatial resolution of magnetic force employed recognition can be made up by utilizing three-dimensional earthquake data structure. Besides, with the constraint of well drilling data, igneous rock reservoir prediction effect is optimized.

Description

technical field [0001] The invention relates to the technical field of geophysical reservoir prediction in petroleum exploration, in particular to an igneous rock reservoir prediction method based on the joint application of seismic, drilling and magnetic force. Background technique [0002] Igneous rock reservoirs have been paid more and more attention to in the eastern and western basins of China. With the advancement of oil and gas exploration technology, major breakthroughs have been made in the field of igneous rock reservoirs in the Junggar Basin, showing broad exploration prospects, especially in the western part of the basin. In the Chepaizi area, igneous rock reservoirs have become the main field of exploration and development. [0003] The lithology of igneous rocks is complex and laterally variable, and only identifying igneous rock reservoirs in a single well cannot meet the requirements of exploration. The key lies in the lateral prediction of igneous rocks. Th...

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Problems solved by technology

[0003] The lithology of igneous rocks is complex and laterally variable, and only identifying igneous rock reservoirs in a single well cannot meet the requirements of exploration. The key lies in the lateral prediction of igneous rocks

The 3D seismic data has a high horizontal sampling rate and good spatial continuity. However, in areas where igneous rocks develop, the seismic reflection features often show blank-weak reflections and random emissions. Conventional seismic exploration techniques such as seismic attributes, seismic reflections, etc. It is difficult to identify the lithology of igneous rocks and the effective reservoir development area; and the magnetic susceptibility characteristics of igneous rocks are often significantly different from those of surrounding rocks, and their magnetic susceptibility is significantly higher than that of sedimentary rocks and carbonate rocks. Not only that, the magnetic susceptibility of igneous rocks It has the characteristics of a wide range of changes, and there are certain differences in the magnetic susceptibility between different igneous rock lithologies. From acidic rocks to basic rocks, the magnetic susceptibility shows a gradually increasing trend. Reservoir prediction, but magnetic data is a comprehensive response to underground magnetic rocks, which cannot meet the requirements of fine exploration of Carboniferous;

[0008] Patent CN201510420518 uses a lot of data, including gravity, magnetism, electromagnetic, seismic and other data, and does not use drilling data

At the same time, the previous patent application carried out a joint inversion study based on the separate inversion processing of gravity and magnetic data, electrical data and seismic data. This inversion method depends on the quality of the original data, and the inversion results are also consistent with The resolution of the original data is comparable, and it is lacking in the accuracy and reliability of igneous rock predictions

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