We appreciate the discussion by Murris (2001) and take the opportunity to clarify some of his objections and discuss some of the still open questions in more detail. Murris's main objections to the conclusions of Littke et al. (1999) concern, first, the influence of overpressure in the Lower Cretaceous and Upper Jurassic on hydrocarbon distribution and, second, the model of gas release by exsolution (degassing) from deep ground water as the main mechanism for accumulating the huge gas fields of northern West Siberia.

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The first objective of Murris's discussion is how the overpressure in Jurassic strata might have influenced the...

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