Peculiarities of ground microseismic monitoring of HF with partial deepening of sensors under the low velocity zone and assessment of the reliability of the results obtained for the well of LUKOIL-PERM LTD

Abstract

Summary The deepening of the sensors of the surface locating system under the low-velocity zone compensates for the influence of inaccuracy in the knowledge of the velocity model in the upper part of the section, reduces the level of registered surface noise and expands the upper limit of the operating frequency range. All this increases the sensitivity to weak events and the accuracy of event location in general. The formation of a hydraulic fracture leads to a change in filtration flows in the reservoir in the well area, which in general should affect the change in flow rate not only in the well with hydraulic fracturing, but also in the adjacent wells. Correlation analysis between daily fluid flow rates in wells before and after hydraulic fracturing, in the presence of statistical relationships, allows to establish a change in the direction of fluid movement in the considered element of the development system and to give a qualitative assessment of the fracture azimuth obtained from the results of microseismic monitoring.