Effect Analysis of Secondary Sand Fracturing Using Four-Dimensional Seismic Imaging of Micro-Fractures

Commonly used means to obtain fracture geometry at present such as temperature log and arrayed acoustic log have some deficiencies,four-dimensional vector scanning imaging was tested.During hydraulic fracturing,longitudinal wave and shear wave produced from rock failure are received by micro-seismic instrument array of multi-channel seismic acquisition station in different patterns near the surface.Wave signals received by geophones are then converted into electrical signals through energy converter.After pre-amplification,they are sent to the recording and analysis system in the form of electromagnetic waves.Finally vector stacking of multi-wave three component seismic data,amplitude inversion modeling and four dimension related visual fracture morphology interpretation techniques are used to analyze the evolution of fractures in time domain.Its application in Well Landi 1 of Erlian Basin showed it could be used to analyze the fracturing energy and fracture evolution in whole fracturing process,and to calculate fracture spatial geometry parameters,which reflect the effect of sand fracturing and provide reliable basis for the future fracturing design and operation.