VERTICAL DISTRIBUTION OF HYDROCARBON GASES IN THE SAATLY ULTRADEEP WELL

Abstract

The hydrocarbon gases and the distribution of organic matter in the rocks were studied in five stratigraphic intervals: Apsheronian, Apchagylian, the productive sequence (Middle Pliocene), Sarmatian, and Upper Cretaceous, which make up three petrologic types of section: I, sedimentary (1583 to 2810 m); II, volcanosedimenta: (2810 to 1655 m); and III, volcanic (3655 to 8267 m). The sedimentary rocks consists of calcareous clays with partings of polymict sandstone, mudstone, and limestone. The volcano sedimentary layer consists of organic clastic limestone with partings of andesite and basalt, with an alternation of amygdaloidal quartz-containing basalt and aggregations of marbled limestone. The volcanic rocks consist of andesite-basalt. Experimental data show that (1) two gas-containing sections can be distinguished in the drill hole, namely a sedimentary section with a high gas content and with the iso forms of C4 + C5 predominating over the normal forms, and a volcanic section with a lower gas content and with the normal forms of C4 + C5 predominating over the iso forms.