Features of the block structure of the Bazhenov-Achimov complex rocks on the example of the Nong-Eganskoye field

UDK: 550.8
DOI: 10.24887/0028-2448-2022-7-70-75
Key words: detailed well log correlation, Western Siberia, Nong-Eganskoye field, sequential paleoprofiling, block structure, anomalous section of the Bazhenov formation, Achimov formation, compensation pack
Authors: I.S. Gutman (IPNE LLC, RF, Moscow), S.V. Arefiev (LUKOIL-Western Siberia LLC, RF, Kogalym), A.A. Obgolts (IPNE LLC, RF, Moscow), E.N. Fedoseeva (Central Oil and Gas Fields Development Commission, RF, Moscow; State Commission on Mineral Resources, RF, Moscow)

Most of the currently known fields of the West Siberian oil and gas province are characterized by a complex geological structure and the presence of reserves difficult to recover. The development of these complex features will help maintain declining production from discovered and developed fields in Western Siberia. Efficient development of deposits of the Bazhenov formation and Achimov formation is possible only if there are objective ideas about the geological structure of these deposits. It seems important to link the features of the formation of these objects at the junction of the Jurassic and Cretaceous periods.

Based on the results of the detailed well log correlation of the entire well stock for the Nong-Eganskoye field, this article will show what processes took place during the formation of the Bazhenov-Achimov rock complex and their results. It has been established that the currently observed sharp "jumps" of the Bazhenov formation itself on the correlation schemes and seismic sections are the result of keyboard block subsidence along consedimentary faults. The analysis of structural and thickness maps of the anomalous section of the Bazhenov formation, the Bazhenov formation itself, and the Achimov compensation pack, showed almost identical outlines of the configurations of the positive or negative structures of the three studied objects, which indicate the tectonic nature of their formation. The use of such research methods as successive paleoprofiling and reduction of to one thickness made it possible to substantiate the formation of the Bazhenov-Achimov rock complex by tectonic movements. Genesis of this complex has a block character of multispeed subsidence of adjacent block. Undisturbed character bedding of rocks deals with different-velocity subsidence of the seabed in the same time interval within the blocks.

References

1. Gutman I.S. Korrelyatsiya razrezov skvazhin slozhnopostroennykh neftegazonosnykh ob»ektov i geologicheskaya interpretatsiya ee rezul’tatov (Correlation of well sections of complex oil and gas objects and geological interpretation of its results), Moscow: ESOEN Publ., 2022, 336 p.

2. Gutman I.S., Comprehensive confirmation of tectonic nature of the anomalous sections of the Bazhenov formation and the lower cretaceous Achimov stratum of Western Siberia. Part 1. The anomalous sections of the Bazhenov formation and the lower cretaceous Achimov stratum of Western Siberia (In Russ.), Aktual’nye problemy nefti i gaza, 2019, no. 3(26), DOI: https://doi.org/10.29222/ipng.2078-5712.2019-26.art5

3. Gutman I.S. Aref’ev S.V., Mitina A.I., The rationale for the block structure of the abnormal sections of the Bazhenov formation and related sections of the Achimov sequence by the example of the North-Konitlorskoe field (In Russ.), Geologiya geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2020, no. 2, pp. 4–12, DOI: https://doi.org/10.30713/2413-5011-2020-2(338)-4-12

4. Gutman I.S., Aref'ev S.V., Mitina A.I., Methods of detailed correlation of well sections in the study of the geological structure of Upper Jurassic and Lower Cretaceous rock complexes on the example of the Tevlinsko-Russkinskoye oil field of the Surgut arch. Part 1. Substantiating the formation features of the Upper Jurassic Bazhenov formation proper and its anomalous sections (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 8, pp. 18-21, DOI: https://doi.org/10.24887/0028-2448-2020-8-18-21

5. Gutman I.S., Aref'ev S.V., Mitina A.I., Methods of detailed correlation of well sections in the study of the geological structure of Upper Jurassic and Lower Cretaceous rock complexes on the example of the Tevlinsko-Russkinskoye oil fields of the Surgut arch. Part 2. Substantiating the formation features of the Lower Cretaceous Sortym formation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 10, pp. 25–29, DOI: https://doi.org/10.24887/0028-2448-2020-10-25-29


Attention!
To buy the complete text of article (a format - PDF) or to read the material which is in open access only the authorized visitors of the website can. .

Mobile applications

Read our magazine on mobile devices

Загрузить в Google play

Press Releases

20.09.2022
19.09.2022
15.09.2022