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Method for recognizing the lithology of petrosilex by using the combined characteristics of gravity-magnetic-electronic anomaly

A technology of combining features and electrical anomalies, applied in the field of geophysical exploration, can solve the problems affecting the success rate of drilling verification and the unconvincing effect of igneous rock identification, so as to reduce the subjective factors of experience and improve the effect of identification effect.

Active Publication Date: 2009-09-02
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

However, at present, we can only rely on artificial experience to infer, there are human subjective factors, different geological interpreters will have different results, and the same interpreter will produce contradictory results twice, making the identification effect of igneous rocks unconvincing. Thus affecting the success rate of drilling verification

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  • Method for recognizing the lithology of petrosilex by using the combined characteristics of gravity-magnetic-electronic anomaly

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Embodiment Construction

[0021] The embodiment of the present invention is used to identify the physical characteristics of Paleozoic rocks in a certain area where igneous rocks are mainly distributed in the Paleozoic and Mesozoic is basically free of igneous rocks.

[0022] 1. Collect drilling cores in the exploration area, measure and record the physical characteristics of each core sample: we collected 1,650 Paleozoic cores from 55 drilling wells in this area, and numbered the cores i1 i2i3...in , n=1650, then carry out physical property measurement to 1650 rock cores, promptly measure the measurement work of the density, magnetic susceptibility and resistivity of rock core, obtain the rock core physical property data of this zone density, magnetic susceptibility and resistivity:

[0023] Core density d1 d2 d3...dn; core magnetic susceptibility m1 m2 m3...mn; resistivity r1 r2r3...rn.

[0024] 2. Carry out k-means clustering analysis on the data of rock density d, magnetic susceptibility m, and res...

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Abstract

The invention provides a geophysical prospecting technical method for recognizing the lithology of petrosilex by using the combined characteristics of gravity-magnetic-electronic anomaly, which comprises the following steps of collecting and recording the physical characteristics of drill core; carrying out cluster analysis on the density, magnetic susceptibility and resistivity of rock by using k-means clustering and obtaining the clustering code of the drill core; carrying out gravity and magnetic anomaly stripping to the gravity and magnetic prospecting result for obtaining the anomaly and adopting the same clustering to conduct three-dimensional anomaly coding; and combining the clustering code of the physical characteristics of rock with gravity-magnetic-electronic anomaly code for reflecting the lithology of each petrosilex in an exploratory area. By developing the method for recognizing the lithology of petrosilex by using integral gravity-magnetic-electronic from qualitative speculation to quantitative statistics, the invention reduces human subjective factors from experience, avoids the situation that different geological interpreters obtain different results and improves the recognition effect of petrosilex.

Description

technical field [0001] The invention relates to geophysical prospecting technology, in particular to a method for identifying the lithology of igneous rocks by utilizing combined features of gravity, magnetoelectric anomalies. Background technique [0002] At present, in oil and gas exploration, a large number of oil and gas reservoirs related to volcanic rocks have been discovered one after another, and the exploration and research of oil and gas reservoirs related to igneous rocks have attracted the attention of the geophysical community. However, in complex igneous rock development areas, it is difficult to identify the lithology and lithofacies of igneous rocks solely by seismic exploration, mainly due to the special physical properties and internal structure of igneous rocks. If the depth is relatively shallow, seismic exploration can obtain the top shape of igneous rocks, but it is difficult Determine the distribution and lithology of igneous rock mass; if the igneous ...

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Application Information

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IPC IPC(8): G01V11/00G01N33/24
Inventor 何展翔江汶波王晓帆刘云祥杨战军
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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