Key words: gas-bearing horizon, gas blowouts, gas hydrates
Cenomanian gas reservoirs at giant Western Siberia gas fields are at the late stage of development. New gas reserves with gas composition identical to Cenomanian could be found in upper part of Tibeisalin suit located at depth 300-600 m. This suite has good reservoir properties and is regionally spread. It is capped by other regional horizon having trap properties. Drill teams often observe gas liberations from this depth interval when drilling through. Tibeisalin horizon is located in the interval of hydrate stability zone and two-phase gas state is expected. So, new exploration and production technologies will be necessary.
References
1. Leonov S.A., Perspektivy gidratonosnosti nadsenomanskikh otlozheniy severa Zapadnoy Sibiri (Prospects of hydrate-bearing at the Over-Cenomanian sediments of north of Western Siberia): thesis of the candidate of geological
and mineralogical sciences, Moscow: Gazprom VNIIGAZ, 2009.
2. Yakushev V.S., Prirodnyy gaz i gazovye gidraty v kriolitozone (Natural gas
and gas hydrates in the cryolite zone), Moscow: Publ. of VNIIGAZ, 2009, 192 p.
3. Stroganov L.V., Skorobogatov V.A., Gazy i nefti ranney generatsii Zapadnoy Sibiri (Early generation gases and oils of Western Siberia), Moscow: Nedra Publ., 2004, 415 p.
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