Results of well-logging data processing by parametric well 1 Aschebutakskaya (Southern Urals)

Abstract

Introduction. The Orsk depression in the Southern Urals is considered as a promising region for oil and gas exploration. A new look at the results of his study of past years is given.

Aim. Identification of reservoir rocks and seals in the study area, identification of promising oil and gas complexes, assessment of oil and gas potential, development of recommendations for further study of the region for oil and gas.

Materials and methods. As part of the study of the prospects of the oil and gas potential of the region, well-logging data on the parametric well 1 Aschebutakskaya (Orskaya depression of the Magnitogorsk trough), drilled in 1993, were processed for the first time.

Results. Visean age limestones (Lower carboniferous) were uncovered by well 1 Aschebutakskaya from a depth of 303.5 m and up to the bottom (1261.2 m). According to well-logging data, their porosity varies from 1.0 to 12.5 %. In the upper part of the limestone there are 15 reservoir layers, the average thickness of which is 4.7 m, the total is 123.1 m. The average porosity is 8.2 %. The type of fl uid is not defi ned. The tires can be layers of mudstone isolated in the thickness of limestones, and dense diff erences of the latter.

Conclusion. The limestone strata of the Visean-Bashkir age, developed in the central part of the Magnitogorsk trough, is promising for the search for oil and gas deposits. It is recommended to process well-logging data on wells of the Ural profile (drilled in the region for oil and gas in the 70s of the last century) at the modern technical and methodological level.