Method for distinguishing hanging wall and footwall of fault in oilfield development zone

Abstract

The invention provides a method for distinguishing a hanging wall and a footwall of a fault in an oilfield development zone. The method comprises a step of obtaining drilling well hierarchical data, a step of creating a hanging wall data file and a footwall data file based on the drilling well hierarchical data in the condition that the fault is a reverse fault, wherein the hanging wall data file comprises hierarchical data of only drilling a formation for one time and hierarchical data with a smaller depth in the hierarchical data of drilling the formation for two times, and the footwall data file comprises hierarchical data of only drilling a formation for one time and hierarchical data with a larger depth in the hierarchical data of drilling the formation for two times, a step of projecting the hierarchical data in the hanging wall data file into a seismic data interpretation system, and identifying the fault position corresponding to the hanging wall of the fault, a step of projecting the hierarchical data in the footwall data file into the seismic data interpretation system, and identifying the fault position corresponding to the footwall of the fault, and a step of distinguishing the hanging wall and footwall of the fault of a no-well zone according to the seismic reflection characteristic of a breakpoint identified in a well area.

Description

technical field [0001] The invention relates to the field of seismic data interpretation, more specifically, to a method for distinguishing upper and lower walls of faults in oil field development zones. Background technique [0002] Distinguishing the upper and lower walls of a fault is a very important link to confirm the structure. The data used by seismic data interpreters to distinguish fault breakpoints mainly come from seismic data volumes and drilling layer data. The drilling layer data is relatively simple ASCII data, which cannot be intuitively To identify fault breakpoints, the existing technology to identify the hanging wall and footwall of geological faults relies more on seismic data, and it is necessary to accurately characterize the breakpoints based on data with higher seismic resolution. Current technologies rely more on seismic attributes, such as coherence technology, ant body technology, variance body technology, dip angle analysis technology, and 3D vis...

AI Technical Summary

Problems solved by technology

[0002] Distinguishing the upper and lower walls of a fault is a very important link to confirm the structure. The data used by seismic data interpreters to distinguish fault breakpoints mainly come from seismic data volumes and drilling layer data. The drilling layer data is relatively simple ASCII data, which cannot be intuitively To identify fault breakpoints, the existing technology to identify the hanging wall and footwall of geological faults relies more on seismic data, and it is necessary to accurately describe the breakpoints based on data with higher seismic resolution

Current technologies rely more on seismic attributes, such as coherence technology, ant body technology, variance body technology, dip angle analysis technology, and 3D visualization to assist fault identification, but complex fault zones are often areas with poor seismic imaging, which gives Seismic attribute extraction brings uncertainty and also restricts the correctness of fault identification

In particular, the upper and lower walls of reverse faults are often difficult to distinguish due to the repetition of strata and the poor effect of seismic imaging.

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