Muon pair production in the process e + + e − → e + + e − + µ + + µ − by the two-photon collisions γγ → µ + µ − at high energies. The transverse momentum distributions AbstractIn this present paper, we investigate the muon pairs production in the interaction between two quasireal photons in e + e − collision. The total and differential cross section of the process γγ → µ + µ − at a beam energy of photons from 3 GeV to 40 GeV in the center-of-mass and for different values of muon transverse momentum and the muon rapidity and the muon angle are calculated. We also study the total cross section, as a function of the e + e − center-of-mass energy √ s in the region 5 GeV ≤ √ s ≤ 209 GeV process of the e + + e − → e + + e − + µ + + µ − by the twophoton mechanism. The obtained our results are in satisfactory agreement with the experimental data. PACS numbers: 12.38.Qk, 13.66.De, 13.85.Lg

The article is devoted to the analysis and interpretation of the VSP data (vertical seismic profiling) obtained in two wells of the Hovsan field. It gives information about the history of the study, the geological and geophysical characteristics of the field and the seismic surveys by the VSP method conducted here in 2010 and 2014 in the wells of 1856 and 1867, respectively. The main parameters of the VSP wells are briefly described and the quality of the seismic material is characterized. Analysis of the velocity obtained from the VSP and Sonic Log acquired in investigated wells shows that after a significant increase in the values of the interval velocities to 4500-4700 m / s at depths of 3600-3800 m, a sharp decrease is observed in their values to ~ 2000 m / s at depths of ~ 5150 m, which corresponds to the speed at a depth of 1000 m. This is confirmed by the seismic inversion of the VSP data. The interval of a sharp decrease in the velocities of seismic waves corresponds to the deposits of the Miocene. This clearly indicates the presence of abnormally high pore pressure in this oilfield, associated with fluid accumulations, which is of great practical interest.

This paper is devoted to the study of a cross-borehole section based on seismic and well-logging data using the “AZERI” software package to determine the well-placement. The main objective was verification of the algorithm and the software on the currently active wells. Overall, the study was conducted on two wells, one of them is reference and the other is the projected well which enabled us to compare the two results. There are several approaches to determine the pay zone heterogeneity in cross-borehole section using the seismic data. Despite various applications, currently there is no application of the filtration properties determination methodology of pay zones in cross-borehole section based on seismic data. Completely different approach to the solution of this problem is considered in this paper. Especially the study of reservoir porosity and permeability of pay zone, as well as the prediction of the producibility of cross-borehole section based on seismic and well-logging data. Thus, the necessary knowledge about porosity and permeability of pay intervals and their producibility is obtained, i.e. the quantitative estimation of the parameters mentioned above is derived. As a result, the accuracy of the achieved results is closely linked to the exploration field’s seismic-geological conditions, depth and the level of seismic data processing as well as the level of similarity of two seismic traces that are picked near the reference and projected wells, not to mention the accuracy of the interpretation of log data. In conclusion, the production well placement determination was carried out by PANGEA Company of Moscow. The selected position of well No.1867 is matching well with the geological results of PANGEA. Therefore, “AZERI” software, constructed based on the algorithms developed by authors, shows that the future well placement risks for the deep drilling are significantly reduced.

The paper is devoted to study of reflection pattern (seismic horizon) and CSP travel time curve of reflected wave when the base of seismic oscillations receivers is within transition zone, i.e. the portion of base is in one flank while the other part is already in the next flank. The equation has been derived for travel time curve of zero-offset survey, i.e. reflection pattern) for the case when target horizon cover is complicated by fault. The other equation derived is the equation of traveltime curve of CSP of reflected wave, which upgoing rays are refracted on the fault line. For this, we have used the equation of traveltime curve of normal reflections refracted on the fault line. Based on derived formulae we have calculated traveltime curves of CSP for various models of environment. Analysis of these models has shown that while passing through seismic waves receiver base over the faulted zone the travel time curve is divided into two cuts with differing curvature and various time offsets relative to each other depending on velocity section difference from the fault line leading to the impression that these two cuts are not the sections of the same travel time curve.

The presented paper includes several results of seismic exploration that was conducted on the Zikh-Hovsan oilfields with the target areas of Miocene reservoirs that underlie the primary Productive Suite of Azerbaijan, Lower Pliocene reservoirs. In 2010, the VSP and offset VSP were conducted on these fields. The paper includes the first wave arrival times for the vertical depth-time relationship, as well as, the different types of waves (P, S, incident, reflecting and exchange), based on the VSP data analysis of three components (XYZ). In addition, the velocity calculated from the VSP data is presented, which correlates with sonic log data. Moreover, the VSP velocity analysis was carried out and the overpressured areas were identified. Furthermore, the results of overpressure analysis which are presented in this paper indicate the velocity of about 2000 m/s at the depths of more than 3900 m, which are supported by the seismic inversion. Stratigraphically, overpressure encompasses the Miocene stratigraphical units. In 2015 the well was drilled that confirmed the fact of oil presence and produced in about 100 tons of oil/day. This fact has also supported the hydrocarbon bearing capacity of Miocene stratigraphical units across Absheron peninsula and its continuation into the Caspian Sea.