Published May 2020, Pg. 4-12

Section: Geology and geophysics

UOT: 553.982

DOI: 10.37474/0365-8554/2020-5-4-12

Geological conditions and reasons for abnormal high formation pressures (in the context of Lower Kur depression)

R.R. Jafarov

Widespread occurrence of abnormal high formation pressure (AHFP) in oil-gas deposits in Lower Kur depression is analyzed. As the reasons associated by the scientists with the occurrence of AHFP a great number of aspects are reviewed. In this regard, more than 280 measurements of the initial formation pressures taken via deep monometer in the first tested wells have been analyzed. Great variety of opinions on the nature of AHFP should be explained with different reasons in geologic-tectonic and litho-facies features, as well as studied sedimentation complexes and other aspects specifying exceeding role of this or that factor. In the view of all mentioned above, each of the factors has been reviewed in detail based on the actual data for initial formation pressures in Lower Kur depression. It was defined that geostatic load can play the role of a constant factor in the occurrence and maintenance of AHFP in the process of sedimentation and consequently in the sedimentation thickening of the rocks.