Global factors in dynamics of petrophysical processes

Abstract

In classical description of structural-tectonic fragments of earth crust vast territories of ancient platforms are represented as geodynamically passive elements of lithosphere. That is why nature of various phenomena occurring on platform (landslides and karst-suffosion processes, rock bursts and gas explosions in mines, pipeline breaks, etc.) is usually associated solely with processes of exogenous changes in geological environment, formed by rocks of sedimentary cover [Natural Hazards in Russia, 2002]. However, results of many years investigations of geodeformation regimes of geodynamically (seismically) active and platform regions allowed experimentally establish [Rudakov, 2009] that in preparation of catastrophic geodynamic phenomena (earthquakes and volcanic eruptions) prominent role played by processes of global change of stress-strain state of lithosphere due to processes of self-organization under influence of Earth velocity rotation variations. In particular, it was shown that these processes are reflected in changes of fluid dynamic regimes of fault structures of East European Platform (EEP), influencing processes of exogenous geological environment transformation, and, appearing in rocks of sedimentary cover by local geodynamic processes and phenomena. For example, it was found that dynamics of accidents on routes of gas pipeline networks of EEP is connected with wave motion of platform, as well as with processes of cyclic fluid transmission in fault transcontinental and regional tectonic formations that form dynamics of karst-suffosion processes in territories of Moscow depression [Rudakov, 2008]. Continuing to investigate links in chain of cause-effect dependence of local geodynamic phenomena and processes from processes of global change in stress-strain state of earth's crust, we made spectral and correlation analysis of a half century (49 years) time series of mean annual cases of karst gap formation in Dzerzhinsk, Nizhny Novgorod region in comparison with variations of water level in Oka River, which flows in area, variations in Earth's rotation and change in solar activity. It allowed to trace development of karst-suffosion processes influenced by changes in fluid dynamic regimes in region controlled by variations in stress-strain state of earth's crust in region associated with variations in Earth's rotation and changes in solar activity, controlling climate changes on Earth as a whole, and in each particular region of planet. Note that problem of assessing influence of solar-terrestrial relationships in processes of terrestrial atmosphere, hydrosphere, and even biosphere, after A.L. Chizhevsky concerned by many researchers [Rivin, 1989] but geological and geophysical aspects of this problem are practically not affected. Especially not enough investigated processes that control in platform conditions development of exogenous processes, such as karst-suffosion. And in this respect opportunity to examine longterm observations, of the Dzerzhinsk karst observatory” of Nizhny Novgorod region allowed, as it seems to us, to take another step toward assessing extent of planetary processes influence on dynamics of geodynamic processes of local scale. Fig. 1 shows original time series of mean annual variations of Earth's rotation velocity (relative value), solar activity (Wolf numbers), cases of karst gaps in Dzerzhinsk and water level in Oka river, which were analyzed on basis of calculation spectral-temporal and correlation characteristics of these time series and their components identified by energy filtering. Fig. 2 shows calculated values of cross-correlation function (CCF) between analyzed time series.