1887

Abstract

Summary

For the first time in the Sea of Okhotsk the large volume of seismic data (more than 7000 square km) has been interpreted for near-surface gas saturated objects (like gas pockets and gas-hydrate deposits) detection and complex analysis. High gas saturation of clastic sediments has been proved, which could be dangerous for drilling. More than 200 small gas deposits (gas pockets) have been detected. Statistical analysis of their sizes has shown that 42,2 % of gas pockets are less than 1 km, 80,3 % - less than 2 km and 97,6 % - less than 4 km with the average size of a gas pocket about 1,37 km. In most cases (about 92,7 %) there are two or more gas deposits, located on different depths. Almost two thirds of gas pockets (64,3 %) situated on less than 400 m from the bottom, with maximum (23,9 %) in 200–300 m interval. The average depth of a gas deposits is 345 m. The results of the study unambiguously witnessing the possibility of extraction of important geological and geophysical information about near-surface gas saturated objects from archive seismic data.

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/content/papers/10.3997/2214-4609.201901795
2019-04-22
2024-04-16
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