Perspectives of Upper Kirmaki clay suite in Chilov field

Abstract

Chilov adasy field is being in industrial operation since 1948. The oil content is associated with Kirmaki, Gala, Lower Kirmaki, Upper Kirmaki sand suites of the deposits of lower section of Productive Series. The oil potential in Chilov field is distributed both on lower and upper wings of the structure which is characterized with the fault of 400-500 m amplitude. The difference is the oil bearing capacity in the lower wing is associated with Kirmaki, Gala, Lower Kirmaki, Upper Kirmaki sand suites while in the upper wing it is connected with only Gala and Lower Kirmaki suites. The first 10 t oil production was obtained on 04.06.1974 in the well No 49 of Upper Kirmaki clay suite in the interval of 647–644 m. Afterwards, despite of oil output from 3 more wells (No 29, 83, 163), the distribution of oil content in Upper Kirmaki clay suite along the field was not clear and the reserves not calculated. Thus, due to the fundamental analysis of field-geophysical data of the wells in Upper Kirmaki clay suite and consideration of test results it was defined that it has commercial oil reserves. The distribution of oil reserves within the blocks of Upper Kirmaki clay suite structure has been specified and the borders defined as well.