Intuitive microearthquake event classification method

A classification method and micro-seismic technology, applied in the direction of seismic signal processing, etc., can solve the problems of wasting computing resources and affecting the positioning accuracy of micro-seismic events

Active Publication Date: 2017-01-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The processing flow has the following problems: First, there is no prior knowledge to classify microseismic events, and the same positioning parameters are usually selected in the positioning process, whic

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  • Intuitive microearthquake event classification method
  • Intuitive microearthquake event classification method

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[0029] In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are listed below in conjunction with the accompanying drawings, which are described in detail as follows.

[0030] An intuitive classification method for microseismic events, including:

[0031] 1) Denoise the original record to improve the signal-to-noise ratio of the record;

[0032] 2) Find out microseismic events based on the energy ratio of long and short time windows;

[0033] 3) Determine the first arrival of the microseismic event;

[0034] 4) The first arrival of the microseismic event in step 3 is processed in order;

[0035] 5) Draw the first arrival of the microseismic in step 4) into the same coordinate system;

[0036] 6) Classify microseismic events according to the first arrival form of the coordinate system in step 5).

[0037] The above scheme further includes:

[0038] The step 3 to determine the first arriv...

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Abstract

The invention discloses an intuitive microearthquake event classification method. The technical scheme includes: firstly, performing de-noising processing on original observation records and increasing signal-to-noise ratio of the records; finding out possible microearthquake events by a long time window and short time window proportion method; collecting first arrivals of the microearthquake events according to continuity of synthetic shafts, performing arrangement processing on the acquired first arrivals and finally superimposing all the first arrivals of the microearthquake events to display. According to distribution of the superimposed first arrivals, the microearthquake events similar in first arrival forms are defined as the same microearthquake event group, unified selection of parameters in post-processing is facilitated, and the events with the curve forms different from the overall trend are defined as stray events or invalid microearthquake events. The intuitive microearthquake event classification method has the advantages that classification of the microearthquake events is convenient, intuitive and reliable.

Description

technical field [0001] The invention relates to the field of hydraulic fracturing microseismic monitoring, in particular to an intuitive microseismic event classification method. Background technique [0002] Hydraulic fracturing technology is the main way to improve the recovery rate of unconventional oil and gas reservoirs such as shale oil and gas. Microseismic monitoring is to locate the fracture location by collecting the signal generated by hydraulic fracturing, so as to guide the fracturing operation and Evaluation of fracturing results. In the existing microseismic data processing program, the first arrival of the microseismic event is usually picked up and located directly, and then the microseismic events are divided according to the distribution of the microseismic event location results. The processing flow has the following problems: First, there is no prior knowledge to classify microseismic events, and the same positioning parameters are usually selected in t...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 陈雨茂左建军武小杰魏国华
Owner CHINA PETROLEUM & CHEM CORP
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