Seismic Prediction Method of Paleozoic Buried Hill Reservoir Based on Structural Guided Filtering
A technology of guided filtering and earthquake prediction, which is applied in the field of oilfield exploration and development, can solve the problems that it is difficult to effectively predict the development degree and distribution characteristics of Paleozoic buried hill reservoirs
Active Publication Date: 2021-09-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
It is difficult to effectively predict the development degree and distribution characteristics of Paleozoic buried hill reservoirs by conventional methods such as seismic attributes and inversion
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[0025] In step 1, using the original seismic data, the dip attribute of the seismic event is calculated to obtain the dip guide.
[0026] In step 2, the original seismic data volume is filtered to form a structure-steering filter volume, constrained by the dip guide body. Among them, the median filter is selected as the filtering method, and the step size is selected according to the actual work area data. After filtering, the seismic axis on the top of the buried hill is more continuous, and the abnormal information is filtered out, which contains the relevant information of the buried hill reservoir.
[0027] In step 3, the structure-steering filter volume is subtracted from the original seismic volume to obtain the residual volume between the two. This contains relevant information such as the reservoirs filtered out by the structure-guided filter, and it can be seen from the profile that it is mainly distributed on both sides of large faults and structural uplifts;
[00...
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The present invention provides a method for seismic prediction of Paleozoic buried-hill reservoirs based on structure-guided filtering. The method for seismic prediction of Paleozoic buried-hill reservoirs based on structure-guided filtering includes: step 1, based on the original seismic data, calculate dip-guided volume; step 2, constraining the original seismic data volume with a dip guide volume, forming a structure-guided filter volume; step 3, obtaining the residual volume between the original seismic data and the structure-guided filter volume; step 4, extracting the ancient Amplitude attribute map of the residual body on the top of the Zozoic, representing the distribution of weathering crust reservoirs on the top of the Paleozoic buried hill. This seismic prediction method for Paleozoic buried hill reservoirs based on structure-guided filtering has important reference significance for the prediction of Paleozoic buried hill reservoirs in faulted basins, and provides favorable support for the description of favorable traps in Paleozoic buried hills .
Description
technical field [0001] The invention relates to the technical field of oilfield exploration and development, in particular to a seismic prediction method for Paleozoic buried hill reservoirs based on structure-guided filtering. Background technique [0002] In oil and gas exploration in eastern my country, buried hill oil and gas reservoirs occupy an important position. Paleozoic buried hill oil reservoirs, in particular, have the characteristics of high productivity and good profitability, and have always been key exploration formations. Due to the complex structural features of the ancient buried hills, the Paleozoic buried hills have experienced many periods of orogeny, the geological structure has undergone severe transformation, and the reservoir types and development models are relatively complex. At the same time, because Paleozoic buried hill oil and gas reservoirs are generally buried deep, seismic data have the characteristics of low signal-to-noise ratio and weak...
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IPC IPC(8): G01V1/36G01V1/30
Inventor 曲志鹏张伟忠张云银于景强李晓晨郭丽娟揭景荣
Owner CHINA PETROLEUM & CHEM CORP