«Geology, geophysics and development of oil and gas fields»

Study of the natural reservoirs hydrodynamic connectivity of the Pre-Jurassic volcanogenic-sedimentary complex of the West Siberian oil and gas basin by petrophysical and geochemical methods

UDC: 553.982.2+553.98(571.1)
DOI: -

Authors:

¹ LUKOIL-Engineering LLC, Moscow, Russia
² National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: hydrodynamic connectivity, natural reservoirs, volcanogenic-sedimentary rocks, Pre-Jurassic complex, petrophysical methods, reservoir geochemistry, capillary-metric studies of core, transition zone model

Annotation:

The authors of the article consider the problematic issues of studying the volcanogenic-sedimentary Pre-Jurassic complex using the example of one of being developed field of the West Siberian oil and gas basin in terms of development objects substantiation and their hydrodynamic connectivity determination using a set of methods, including field geophysical, petrophysical and reservoir geochemistry. As part of the work performed, it was shown, that the integration of the results of petrophysical, field geophysical and geochemical studies allows solving the tasks quite effectively. The specified methods can complement each other, so the results of oils reservoir geochemistry allow specifying the levels of the clean water table in the transition zone model for collectors at high hypsometric marks, and the data of petrophysical modeling allow identifying possible substandard samples. As a result of the conducted research, without carrying out expensive work using available methods, it was possible to establish that the section of the Pre-Jurassic complex of the studied deposit consists of 4 reservoirs – fluid-dynamically isolated objects, three of which are confined, in fact, to the Pre-Jurassic complex and the fourth one – "transitional" – belongs to the junction zone with the Tyumen suite.

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