Microseismic Background Study for Gas Field Exploration

One of the novel and promising methods of hydrocarbon field exploration includes recording of microseismic background before and after a vibrator work. Comparison of spectrums of microseismic background recorded at different sites showed, that in case of records made over several gas fields a low frequency peak appeared in the spectrum ratios. At the same time, processing of some of the data showed low reliability of that conclusion for some of gas fields. In presented paper we consider application of non-linear dynamics method (method of Grassberger & Procaccia) for the microseismic data processing, which looks to be more adequate for such type of data. It was found, that in studied cases vibration action within gas field contour leads to change of microseismic background characteristics. Out of gas reservoir contour any changes of microseismic background were not detected.