No abstract

No abstract

No abstract

Using the example of lower nutovsky thickness on Odoptu field discusses the possibility and efficacy of sequence-stratigraphic approach to integrated interpretation of seismic data and drilling materials. Sequence stratigraphic model, graph showing sea level changes and regional chronostratigraphic correlation chart with reference to the existing geochronological scale was developed for the formation of the sedimentary cover in the research area.

We have evaluated the results of processing and interpretation for one of the first projects in Russia for downhole microseismic monitoring of hydraulic fracturing in Western Siberia. The data are characterized by large distance to the acquisition array and noisy recordings. We illustrate that preliminary quality control of microseismic array installation is a useful tool that may predict some of the issues and help to promote better acquisition quality. Therefore, it is important to reiterate the importance of the supervision for microseismic field measurements, especially when the technology is tested in new regions. Despite limited acquisition aperture and a comparatively small number of observed microseismic events, it is possible to derive valuable interpretation results from the data set. The geometry of the event locations suggests significant unplanned development of the hydraulic fractures, including a significant shift of the fracture from the initiation point. Records with clear S-wave splitting allowed us to determine arrival times of P waves and two S waves for several microseismic events. Arrival times were then used for simultaneous kinematic inversion for microseismic-event location and anisotropic velocity-model update (layered transversely isotropic with the vertical axis of symmetry model). We report significant anisotropy derived from microseismic data. Thomsen parameters ε and γ are well constrained, whereas parameter δ is constrained only for one of the layers.