METHOD FOR SEISMIC MONITORING OF HYDRAULIC FRACTURING PROCESSES IN DEVELOPMENT OF HYDROCARBON DEPOSITS AND HEAT IMPACT PROCESSES IN DEVELOPMENT OF HIGH-VISCOSITY HYDROCARBONS Russian patent published in 2021 - IPC E21B43/267 G01V1/00 G01V1/28 G01V1/30 

FIELD: measuring.

SUBSTANCE: invention relates to a method applied for ground seismic monitoring of hydraulic fracturing of a hydrocarbon layer. In the monitoring mode of the survey, the seismic wave field is continuously recorded from several hours to several days, thereby providing a possibility of estimating the change in the level of microseismic emission. The result of microseismic monitoring is localisation of hypocentres of microseismic events. The claimed method provides a possibility of obtaining a catalogue of located events upon completion of processing. The catalogue comprises the recording time, the coordinates of the located event, the accuracy of selecting the solution in the form of a dimensionless coefficient, and the attributes of the microseismic signal. Further, at the post-processing stage, the obtained catalogues can be imaged in a video format in order to track the changes in the microseismic emission anomalies over time, the observation system is segmented, thus providing a possibility of placing seismometers in areas with a reduced noise load, thereby providing a possibility of increasing the signal-to-noise ratio. 3-component seismic equipment is used in the claimed technique, registering the signal in three directions. The basis of interpretation of the problem consists of the physical process of seismic diffusion (microtremor) caused by changes in the pore pressure. The process occurs both in the petroleum and gas saturated strata development objects and as a result of heat impact on the formation in the process of changing the temperature mode during the development of high-viscosity hydrocarbons. Anomalies reflect the hydrodynamic changes of local and areal nature, therefore the intensity of the anomaly is an integral density value of the recorded events. The method has been tested and has practical application in areas of hydrocarbon layer deposits.

EFFECT: increase in the accuracy and informational value of the received data.

3 cl