Article
Pressure anomalies on the Totea-Vladimir structure (Getic Depression)
Mihai Remus Şaramet - “Al. I. Cuza” University of Iaşi, Faculty of Geography and Geology, Department of Geology, 20A Carol I Blv., 700505 Iaşi, Romania, Department of Geology Cătălin Hamac - “Al. I. Cuza” University of Iaşi, Faculty of Geography and Geology, Department of Geology, 20A Carol I Blv., 700505 Iaşi, Romania, Department of Geology Ciprian Chelariu - “Al. I. Cuza” University of Iaşi, Faculty of Geography and Geology, Department of Geology, 20A Carol I Blv., 700505 Iaşi, Romania, Department of Geology
View abstract as pdf file | View full article as pdf file
Abstract:
The Totea-Vladimir structure belongs to the Getic Depression, which was formed at the
beginning of the Lower Miocene in the South Carpathians foredeep. In terms of hydrocarbon
accumulations, the Sarmatian and Burdigalian formations are of major trade interest. In this
context, several technical problems were encountered at the entry of the drilling bits into the
Burdigalian formations due to certain abnormal pressures, although their possible occurrence has
been monitored in the geologist's cabin. The method used by the geologist was generically
named "the Corrected dc-exponent", and it pointed out the entry of the drilling bits into the
overpressured Burdigalian formations, but it failed to establish the correct value of the recorded
pressures; therefore, the necessary measures to avoid the kicks were not taken in advance.
Consequently, in the present paper, to correctly establish both the entry into overpressured areas
as well as the value of their pressure, it was used the method proposed by Bourgoyne and Young
(1974) which, applied to "H" well, it rightly indicated the magnitude of the pressure at the entry
of the drilling bit into the Burdigalian formations.
Regarding the causes of the pressure deviations in the Burdigalian formations opened by the "H"
well, this paper shows that their presence is closely related to the tectonic events that have
controlled the completion of the Totea-Vladimir structure architecture during the Sarmatian
period.
Keywords:
Totea-Vladimir structure, abnormal pressure, drilling, kick
|