--> Abstract: Deep Tectonic Features of the Volgo-Ural Petroleum Province, by Vladimir A. Trofimov, Yury A. Romanov, and Alexander P. Petrov; #90072 (2007)

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Deep Tectonic Features of the Volgo-Ural Petroleum Province

Vladimir A. Trofimov, Yury A. Romanov, and Alexander P. Petrov
Institute for geology and development of fossil fuels (IGIRGI), Moscow, Russia

CMP deep seismic prospecting can provide new data on the deep tectonics of petroleum regions. Valuable data have been acquired on the Zhigulevsk thrust that bounds the Zhigulevsk-Pugachevsk Arch. Regional deep seismic data indicate the presence of a fault but characterise it as a major overthrust linked to the Moho discontinuity.
New data have also been obtained on Geotraverse TatSeis crossing the Volga-Ural Petroleum Province from northwest to southeast and passing through the Romashkino giant oil field.
The dominant feature of the wavefield at long times is the presence of dipping events rising in a southeast direction. These are characterised by a distinct zonation: these lineups are mainly observed in the southeastern section of the geotraverse, in the interval of 100-430 km, where oil fields are located.
Data from super-deep wells permit the conclusion that the dipping reflectors are faults and are associated with zones of broken, fractured rocks. The shape of the reflectors, their flattening with depth and connection with near-horizontal, stratified zones all suggest that these were formed under horizontal compression and are overthrusts, i.e. the type of structures, which have already been identified by the author. Recent tectonic events, recorded in petroleum regions of Tatarstan, indicate that these structures are currently active.
The principal result of the conducted deep seismic studies is the identification of sloping dipping reflectors in the Earth's crust and upper mantle below oil fields.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece