GAS GEOCHEMICAL RESEARCH AS A METHOD OF EXPLORING GAS HYDRATES AND DETERMINING HYDROCARBON DEPOSITS
A.I. Obzhirov, Yu.A. Telegin, R.B. Shakirov, N.S. Syrbu, V.Yu. Kalgin, N.S. Lee, A.L. Ponomareva, A.I. Eskova
V.I. Ilichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
Keywords: natural gases, methane, Sea of Okhotsk, marine sediments, faults, seawater
Abstract
Gas geochemical research as a method of exploring gas hydrates and determining hydrocarbon deposits A wide range of applications of gas geochemical investigation in science and practice and for solving various geological and engineering problems are considered in the paper. The method we developed represents a package of technical solutions for extracting gas from water and sediments, and for determining the following gas components on a gas chromatograph: methane (CH4), heavy hydrocarbon gases (C2-C5), carbon dioxide (CO2), hydrogen (H2), helium (He), oxygen (O2) and nitrogen (N2). It is shown that hydrocarbon gases and hydrogen are an indicator of the possible presence of hydrocarbon deposits, carbon dioxide - of the presence of intrusive activity, and helium shows the gas flow from deep horizons and the mantle. Based on the data of gas geochemical studies, the amount of gas hydrates in the upper layer of the gas hydrate strata was calculated. The possibility of using gases to clarify the stratification processes in the sea is shown. The important role of combining the gas geochemical method with other methods for searching for oil and gas fields, mapping fault zones, determining their seismic-tectonic activity and other geological studies is noted.
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