Method for comprehensive recognition of igneous rocks by employing gravity, magnetism, electromagnetism, and earthquake data

Abstract

The invention discloses a method for comprehensive recognition of igneous rocks by employing gravity, magnetism, electromagnetism, and earthquake data. The method includes steps: building templates of different igneous rocks and stratum physical properties; performing forward modeling of gravity, magnetism, electromagnetism, and earthquake, and making clear of response characteristics and rules; performing gravity and magnetism anomaly extraction of the planes of the igneous rocks and weak anomaly enhancement processing, and explaining and dividing distribution zones and range of the planes of the igneous rocks; performing electrical and seismic profile data igneous rock target processing explanation and making clear of the distribution rule of the igneous rocks in the vertical direction; performing combined inversion of gravity, magnetism, electromagnetism, and earthquake data profile, and building a vertical distribution frame of the igneous rocks; developing three-dimensional inversion of the physical properties of the igneous rocks with gravity and magnetism anomalies by employing the profile combined inversion result and drilling data as the constraint condition and with the combination of plane distribution of the igneous rocks; and recognizing the space distribution and lithological and lithofacies distribution rules of the igneous rocks in a comprehensive manner with the combination of physical property combined characteristics of different igneous rocks according to the three-dimensional distribution of the physical properties. According to the method, comprehensive recognition of the igneous rocks is realized by employing various data, and the reliability is higher compared with the recognition of the igneous rock by employing single data.

Description

technical field [0001] The invention relates to the technical field of geophysical data processing and geological comprehensive interpretation in petroleum exploration, and specifically relates to a method for comprehensively identifying igneous rocks using gravity, magnetic force, electromagnetic and seismic data. Background technique [0002] Large-scale superimposed petroleum basins have undergone multiple periods of tectonic movement and evolution. In the early rift or fault depression stage, there were generally multiple periods of intense magmatic activity, and many deep igneous rock bodies were preserved. More and more oil and gas exploration wells have revealed that, affected by special diagenetic mechanisms and petrophysical properties, some deep igneous rocks have superior storage properties, and may be enriched in oil or gas under suitable petroleum geological conditions, forming large-scale oil and gas deposits. Tibetan. [0003] As far as the current exploratio...

AI Technical Summary

Problems solved by technology

In the prediction technology of igneous rock reservoirs, the use of AVO technology has been successful, but due to the lack of understanding of the geological model for prediction of igneous rock reservoirs, the accuracy of seismic prediction technology for igneous rock reservoirs is still not enough

[0005] However, in some areas where igneous rocks develop, thick layers of igneous rocks have a strong shielding and absorbing effect on seismic signals, making seismic data mostly blank or chaotic reflections inside igneous rocks, which restricts the description and target selection of Carboniferous igneous rocks

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