Geophysical surveys in the southern part of the Central Sakhalin Fault based on new integrated network

On the example of the Aniva gas fields, Sakhalin island located in the immediate vicinity of the active Central Sakhalin Fault, the dependences of the seismicity level on the gas production rate are shown. The distribution of earthquake epicenters is usually confined to the boundaries of the developed fields. While the areas of the fields themselves remain almost aseismic. The main contribution to the level of local seismicity is made by the regional Central Sakhalin Fault and its impact zone structures. It is noted that during the entire production time, there was no significant earthquake in their vicinity that would have caused damage to the social infrastructure. However, the obvious correlation between the production dynamics and seismic activity makes it necessary to further study and monitor the seismicity in the fields area.

Section: Resultsmentioning

confidence: 99%

“…This makes the object of research very attractive, because one of the problems of conducting such work is inaccessibility. Such work was started in IMGG FEB RAS [8], but unfortunately, it was curtailed due to lack of funding. If there is interest from the scientific community, industry or government agencies, it will be easy to renew them.…”

Section: Discussionmentioning

confidence: 99%

On the Relationship of an Active Fault Seismicity with the Gas Production Dynamics by Example of the Aniva Gas Fields on Sakhalin Island

Kamenev

2022

“…However, the output data have not been published in open access so, there is no way to analyze the experiment results. Consequently, IMGG FEB RAS has purchased its own special wave recorder for molecular-electronic sensors in order to continue the experiments on Sakhalin Island [3]. In addition, there were disadvantages in using the set of batteries as a power source for the electric pulses: high cost and heavy weight, no air transportation, permanent maintenance of the construction since a drop of electromotive force (EMF) occurs, that negatively affects an experiment.…”

Section: The First Experimentsmentioning

confidence: 99%

The experimental results of the geophysical pulse voltage generator

Gulyakov

Stovbun

2021

The paper is devoted to the development process of the geophysical pulse voltage generator. The peculiarity of the generator lies in the non-specific purpose of this type of construction. Its main function is the controlled effect on the active faults of seismically dangerous zones. The results of the field experiment with the constructed device from 2018 to 2020 are presented. During the experiments, estimations and theoretical analysis we have obtained the seismic noise recorded by means of molecular electronic instruments and determined the periods of the electrical pulses. Operational parameters of the generator were identified on the basis of experiment results. The software and hardware elements of the system were upgraded and, as a result, a new version of the geophysical pulse voltage generator was developed.

Relationship of the Latest Seismicity of an Active Fault with Variations of Geophysical Fields

Kamenev

2021

With using of geophysical equipment deployed in the vicinity of the active southern Sakhalin fault, variations of natural geophysical fields were obtained and studied. It is shown that a significant change in the background values of subsurface radon and telluric potentials occurs some time before the seismic event in the instrument observation area, as well as after the events. Together with the medium-term earthquake forecast and geomechanical modeling, these observations can significantly detail the place of preparation for an earthquake, as well as monitor the subsequent development of the implementation of seismic events.