Distribution of shallow gas accumulations in the sediments of the south-western part of the Peter the Great Bay (Japan Sea)

Abstract

High-resolution seismic investigations ware carried out to study the south-west part of the Peter the Great Bay. Acoustic anomalies associated with gas presence were revealed in the sediments of the shelf of the Bay. Classification of the types of acoustic anomalies of gas origin in the upper part of sedimentary cover was carried out. Their lateral extension has been mapped. Analyses of the geological structure of the bay depression suggest that the Permian sediments with coal layers and peaty sediments in the base of Holocene strata are the possible gas source origin.