Optimal Sequence of Gas Field Investigations from the Kovycta Gas-Condensate Field

Buddo, I.V.; Misurkeeva, N.V.; Agafonov, Yu. A.; Смирнов, А. С.

doi:10.3997/2214-4609.201600167

Cited by 2 publications

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“…Это позволяет отнести Ковыктинское ГКМ к объектам со сложной структурой, которым свойственно неравномерное распределение продуктивных залежей, проявление в природных трещинных резервуарах ано мально низких и аномально высоких давлений флюид ных систем, выходы рапы или поглощения бурового раствора в процессе проходки скважин. Перечислен ные осложнения в полной мере характерны для Ковык тинского лицензионного участка (ЛУ) Smirnov et al, 2016;Buddo et al, 2016], на примере которого в данной статье иллюстрируются основные этапы тектонофизического подхода к выявлению структуры и напряженного состояния осадочного чехла (рис. 1, а).…”

Section: объект исследованийunclassified

Analysis of the Fault-Block Structure and Stress State of the Sedimentary Cover in Gas-Condensate Deposits: Basics of the Tectonophysical Approach

Seminsky

Burzunova

Bornyakov

et al. 2023

Geodin. tektonofiz.

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Consideration is being given to the tectonophysical approach to the reconstruction of structure formation mechanisms and stress-strain state of rocks in hydrocarbon deposits localized in the platform cover, which has a complex structure in terms of rheological layering and disturbance by different-rank fractures. With the Kovykta gas condensate field, largest in Eastern Siberia, there were shown the main methods and ways of using modern achievements in tectonophysics for interpreting geological and geophysical information on the upper and lower parts of the sedimentary cover, unique in terms of volume and significance, that was obtained during geological exploration therein. Regularities of changes in the stress-strain state of rocks, found during the research, are combined into a tectonophysical model, which can be used as a base for other hydrocarbon deposits. The model is based on the concept of a zone-block structure of the platform cover, which is formed by a network of subvertical and subhorizontal fault zones that divide it into less faulted blocks. Disjunctive structures are highly fractured zones with concentration of relatively small low-amplitude faults, i.e. represent the early stages of faulting. The zone-block structure is formed mainly by tectonic or gravitational forces; in the first case, the stages and fracture characteristics are transformed onto the platform from the surrounding mobile belts, and in the second case they are determined by the presence of ductile rocks in the section capable of gravitational sliding. The graphic component of the tectonophysical model is 3D datasets that show the zone-block structure and stress state of rocks for the deposit with the degree of detail provided by key geophysical materials and, primarily, by seismic data. By modern GIS, this information can be quickly retrieved for any-size area of the studied rock mass and then used as a basis for solving production issues related to the development of deposits in fracture-pore reservoirs, or for analyzing general problems of their formation and dynamics.

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Section: объект исследованийunclassified

Analysis of the Fault-Block Structure and Stress State of the Sedimentary Cover in Gas-Condensate Deposits: Basics of the Tectonophysical Approach

Seminsky

Burzunova

Bornyakov

et al. 2023

Geodin. tektonofiz.

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“…1 -large faults that are clearly (a) and less clearly (б) manifested in the relief; 2 -the same for small fractures; 3 -fault zones, including the Zhigalovo (1) and Khanda (2); 4 -earthquake epicenters according to the catalog published by the Baikal Branch of the RAS Geophysical Survey; 5 -marginal suture of the platform; 6 -seismic stations; 7 -hydrographic network. цензионный участок (ЛУ) [Vakhromeev, Khokhlov, 1988;Vakhromeev et al, 2016;Smirnov et al, 2016;Buddo et al, 2016]. Это послужило причиной выбора его в качестве объекта для апробирования тектонофизического подхода к анализу разнотипной геолого-геофизической информации.…”

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Tectonophysical approach to the analysis of geological and geophysical data on gas-condensate deposits with the complex platform cover

Семинский

Sankov

Огибенин

et al. 2018

Geodin. tektonofiz.

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The article presents the results of the tectonophysical approach to the analysis of stress fields and the structure of gas–condensate deposits with the complex platform cover. The discussed case is the Kovykta license area (LA) in Eastern Siberia, Russia. In the upper part of the cross section, the network of fault zones was identified from the relief lineaments and structural data. The dynamic conditions for faulting (compression, extension, and strike-slip) were reconstructed by the paragenetic analysis. The state of crustal stresses in the study area was studied by tectonophysical modeling using gelatin as an optically active material. The applied method was successful in distinguishing between the zones of faults in the platform cover, which differ in the degree of their activity in the specified stress fields. The lower part of the cross section in the NE segment of the Kovykta LA is considered as an example of the tectonophysical interpretation of the electrical and seismic survey data in order to identify the fault zones and reconstruct the corresponding stress fields. Based on the synthesis of the analyzed data, it is revealed that the deposits like the Kovykta gas condensate field (GCF) show the zone-block structure of the platform cover formed under the influence of several stress fields closely associated with the stages of tectogenesis in the adjacent mobile belts. The next objective is to enhance the tectonophysical approach in order to develop a hierarchical model of the GCF zone-block structure, which details need to be known for improving the prediction of sites with the complicated stress-strain state of rocks and mitigating the risks associated with drilling exploration and production wells.

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Optimal Sequence of Gas Field Investigations from the Kovycta Gas-Condensate Field

Cited by 2 publications

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Analysis of the Fault-Block Structure and Stress State of the Sedimentary Cover in Gas-Condensate Deposits: Basics of the Tectonophysical Approach

Analysis of the Fault-Block Structure and Stress State of the Sedimentary Cover in Gas-Condensate Deposits: Basics of the Tectonophysical Approach

Tectonophysical approach to the analysis of geological and geophysical data on gas-condensate deposits with the complex platform cover

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