Sueglinsky Uplift
At the present time, the problems of delineation of small oil deposits, inspection of seismic uplifts for availability of hydrocarbons, and prospecting for structurally complex hydrocarbon traps of various kinds would be most acute in surveys for oil on the ground in Republic of Tatarstan. The main geo-physical oil exploration method such as seismic exploration is unable to solve these challenges unambiguously and there is imperative that prospecting and exploration methods different from seismic ones should in invoked.
Surveying by vertical electric current sounding was performed to evaluate the prospectivity of the Sueglinsky seismic uplift in order to reveal an oil pool. This seismic uplift is located near the Malokir-mensky seismic uplift within the bounds of which the oil pool was revealed as a part of the Shiisky oil field.
Electrical exploration studies were performed throughout the area of 51 km2. The circular electric dipole with the radius of 1250 m was used as a source of an electromagnetic field; the total current was 144 А.
As a consequence of the works carried out using the VECS technology, the area prospective for oil embracing the area of positive values of signals with the intensity more than 1.5 uV had been isolated.
The Sueglinsky seismic uplift, for evaluation of prospectivity of which the present works were aimed, turned to be low prospective for revealing hydrocarbons. According to the obtained data, the south-eastern part of the exploration area, i.e., Nurmansky seismic uplifts, was the most prospective for re-vealing oil in Devonian deposits. Throughout the whole survey area, geochemistry GORE SORBER was undertaken, which also revealed that sites with potential for oil discovering more than 90 % were in the eastern part of the area and these were, in the most part, overlapped with areas of the positive prediction made on the basis of the VECS results.
Plot of EMF at time 201 ms after current cut-off in circular electric dipole.
Articles
V.S. Mogilatov, A.V. Zlobinskiy. The complex prospecting of a variety of electromagnetic parameters of the medium above seismic uplifting for the detection of oil deposits. // Geophysics, 2013, No. 2, p.51-57 1 Mb, pdf-file
About VECS
Electrical prospecting by the method of vertical electric current sounding (VECS) as applied to oil targets. 2 Mb, pdf-file