Role of multiple reflections in the formationof wave field in the cretaceous successions of the Middli Kura depression in Azerbaijan
DOI:
https://doi.org/10.24028/gzh.v43i3.236384Keywords:
Mesozoic deposits, seismic exploration, seismic horizon «P», multiple waves, modeling, velocity analysisAbstract
The article is devoted to the elucidation of the nature of the wave field recorded below the supporting-dominant seismic horizon «P» in the Middle Kura depression of Azerbaijan. A brief overview of the work carried out here is given; it is indicated that some geologists and geophysicists of our country, in our opinion, mistakenly assume that the observed wave field below the specified horizon is formed mainly by multiple reflections.
Since the introduction of the common depth point method into the practice of seismic exploration, individual areas of the Middle Kura depression in Azerbaijan, including the Yevlakh-Agjabedi trough, have been repeatedly studied with varying degrees of frequency tracking. On the basis of this, a fairly large number of promising structures have been identified and mapped. But the structure of the Mesozoic, in particular the deposits of the Upper Cretaceous, still remains insufficiently studied.
The study of the geological structure of the Mesozoic sediments, which are considered promising in terms of oil and gas content, is an urgent geological task; exploration work was carried out in the studied areas of the Middle Kura depression using a complex of geophysical methods at the modern technical and methodological level and new results were obtained. The constructed seismic sections show a dynamically pronounced and well-traceable seismic horizon corresponding to the Mesozoic surface and located deeper than it, relatively weak, short, discontinuous reflective boundaries that characterize the structure within the Mesozoic deposits. The studies carried out on the basis of modeling and velocity analysis made it possible to prove that the wave field in the time interval corresponding to the Mesozoic deposits owes its origin to intermittent single reflections from volcanic-carbonate deposits of the Upper Cretaceous age.
References
Aliev, A. I. (2005). The lower level of oil and gas content: a promising direction of prospecting and exploration work in Azerbaijan. AMEA-nınxəbərləri, Yerelmləri, (2), 29—40 (in Russian).
Akhmedov, T. R., Agaev, Kh. B., & Bakhtiyarov, R. E. (1993). Geoseismic modeling and its application in the Tarsdallar area of the Kura and Gabyrra interfluve. Uchenyye zapiski Azerbaydzhanskoy gosudarstvennoy neftyanoy akademii, (5), 17—22 (in Russian).
Gogonenkov, G. N., Ivanov, V. A., & Zakharov, E. T. (1973). Isolation of useful waves against the background of residual multiples by the CDP method. Prikladnaya Geofizika, (72), pp. 33—47) (in Russian).
Denisov, M. S., & Finikov, D. B. (2006). On the methods for predicting multiples waves using migration-type transformations. Geofizika, (6), 3—14 (in Russian).
Denisov, M. S., & Silaenkov, O. A. (2008). Expansion of the possibilities of processing the results of seismic observations through the use of the procedure of the continuation of the wave field. Tekhnologii seysmorazvedki, (3), 3—18 (in Russian).
Denisov, M. S., Poluboyarinov, M. A., & Fi¬ni¬kov, D. B. (2006). Sustainable methods of adap¬ti¬ve subtraction of multiple waves in seismic ex¬plo¬ration. Abstracts of the International Geo¬phy¬sical Conference St. Petersburg (in Russian).
Denisov, M. S., Patrikeev, P. V., & Finikov, D. B. (2011). Ways to implement algorithms for the continuation of wave fields in complex environments. Geofizika, (2), 3—11 (in Russian).
Karaev, B. M., & Niyazov, T. Kh. (2013). On the origin of reflected waves recorded in the Mesozoic interval of seismic sections in the exploration areas of the Yevlakh-Agjabedin trough of Azerbaijan. Geofizika, (4), 65—69 (in Russian).
Niyazov, T. Kh. (2017). Investigation of the geological structure of intra-Cretaceous deposits on the structures of the Yevlakh-Agdzhabedinsky trough based on seismic data. Abstract of the dissertation of Doctor of Philosophy on Earth Sciences. Baku, 22 p. (in Azeri).
Puzyrev, N. N. (1997). Methods and objects of seismic research. Introduction to General Seismology. Novosibirsk: Publishing house of the SB RAS, 301 p. (in Russian).
Yusifov, Kh. M. (2013). Substantiation of the prospects for oil and gas content of deeply submerged sediments in Azerbaijan. ANKH, (5), 13—25 (in Russian).
Berryhill, J. R. (1986). Submarine canyons: Velocity replacement by wave-equation datuming be¬fore stack. Geophysics, 51(8), 1572—1579. https://doi.org/10.1190/1.1442207.
Berryhill, J. R., & Kim, Y. C. (1986). Deep-water peg legs and multiples: Emulation and suppres¬sion. Geophysics, 51(12), 2177—2184. https:// doi.org/10.1190/1.1442070.
Levin, F. K., & Shah, P. M. (1977). Peg-leg multiples and dipping reflectors. Geophysics, 42(5), 957—981. https://doi.org/10.1190/1.1440775.
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
