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Experience of seismic works in folded regions

UDK: 550.834.017
DOI: 10.24887/0028-2448-2017-12-17-19
Key words: combination of seismic and non-seismic exploration methods in a high folded zone condition, ray modeling, artefacts of migration, 2D and 3D methods comparison, time and depth migration
Authors: R.A. Fedorchuk, V.A. Shashel (Gazprom Neft PJSC, RF, Saint-Petersburg), A.A. Naumov, D.A. Litvichenko (Gazpromneft NTC LLC, RF, Saint-Petersburg)

The common practice for the oil companies nowadays is to be involved into researches of oil and gas in folded regions. Problem of geological researches in such areas lie in complexity of structures and inaccessibility of these areas. By this work authors tried to show the main problems which were tackled by Gazprom Neft oil company during its practice in such regions. Non-seismic methods and their contribution into interpretation are shown. It is mentioned that the most conclusive method among non-seismic researches is geological survey calibrated against satellite photos. This method is efficient both in combination with seismic survey and as independent method of studying. The reason why dynamical interpretation is limited (or impossible) in high folded zones is considered. The importance of controlling the migration stage is noted and uncertainties that may arise at the migration stage when working with steeply falling borders are fixed. It was estimated influence of migration on final result in terms of ray-tracing modeling. Typical errors in the interpretation of migration artifacts are noted. Restrictions of 2D seismic were showed, represented a wave pattern on 2D profiles which are oriented not optimally. In the article was considered advantages of depth migration and was given proves of necessity of interpretational supporting of all stages of project.

References

1. Litvichenko D.A., Ray modeling results - the basis of acquisition system optimal parameters selection (In Russ.), Tekhnologii seysmorazvedki, 2016, no. 4, pp. 77–83.

2. Litvichenko D.A., Sorokin A.S., Nazyrov D.D., Primenenie tekhnologii luchevogo modelirovaniya pri proektirovanii sistemy seysmicheskikh nablyudeniy 3D v seysmogeologicheskikh usloviyakh Zapadnoy Sibiri (Application of the raypath modeling technology in the design of the 3D seismic surveillance system in the seismogeological conditions of Western Siberia), Proceedings of 18th Scientific and Practical Conference on the Exploration and Development of Oil and Gas Fields “EAGE-Geomodel’ 2016”, 12-15 September 2016, Gelendzhik.

3. Vermeer G.J.O., 3-D seismic survey design, Geophysical References Series, 2002, no. 12, p. 205.

The common practice for the oil companies nowadays is to be involved into researches of oil and gas in folded regions. Problem of geological researches in such areas lie in complexity of structures and inaccessibility of these areas. By this work authors tried to show the main problems which were tackled by Gazprom Neft oil company during its practice in such regions. Non-seismic methods and their contribution into interpretation are shown. It is mentioned that the most conclusive method among non-seismic researches is geological survey calibrated against satellite photos. This method is efficient both in combination with seismic survey and as independent method of studying. The reason why dynamical interpretation is limited (or impossible) in high folded zones is considered. The importance of controlling the migration stage is noted and uncertainties that may arise at the migration stage when working with steeply falling borders are fixed. It was estimated influence of migration on final result in terms of ray-tracing modeling. Typical errors in the interpretation of migration artifacts are noted. Restrictions of 2D seismic were showed, represented a wave pattern on 2D profiles which are oriented not optimally. In the article was considered advantages of depth migration and was given proves of necessity of interpretational supporting of all stages of project.

References

1. Litvichenko D.A., Ray modeling results - the basis of acquisition system optimal parameters selection (In Russ.), Tekhnologii seysmorazvedki, 2016, no. 4, pp. 77–83.

2. Litvichenko D.A., Sorokin A.S., Nazyrov D.D., Primenenie tekhnologii luchevogo modelirovaniya pri proektirovanii sistemy seysmicheskikh nablyudeniy 3D v seysmogeologicheskikh usloviyakh Zapadnoy Sibiri (Application of the raypath modeling technology in the design of the 3D seismic surveillance system in the seismogeological conditions of Western Siberia), Proceedings of 18th Scientific and Practical Conference on the Exploration and Development of Oil and Gas Fields “EAGE-Geomodel’ 2016”, 12-15 September 2016, Gelendzhik.

3. Vermeer G.J.O., 3-D seismic survey design, Geophysical References Series, 2002, no. 12, p. 205.



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