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- Title
哈萨克斯坦苏克气田富氦天然气藏地质特征及成藏主控因素.
- Authors
谷晓丹; 贾承造; 陈践发; 姜林
- Abstract
Abstract:Based on core data, physical property, well logging, gas test, composition, helium distribution of 13 new wells, in combination with regional tectonic evolution, depositional background and typical gas reservoir profile, geological characteristics and main controlling factors of helium-rich gas reservoirs have been explored. The results show that three gas reservoirs formed from bottom to top, i.e., granite and metamorphite fractured reservoir in basement, tight sandstone structural reservoirs in Devonian and huge continuous carbonate reservoirs in Lower Carboniferous. The fracture developed on structural points controls high production and gas is well displayed in low structural area. Dry gas is rich in helium and the helium content is lower from basement to Carboniferous. The pre-Devonian large-scale granite and metamorphite basement is the main helium source, and the high-gamma sandstones of Devonian and Carboniferous are the secondary source. The fracture is filled up and conducts in two-ways, gas from Carboniferous source rocks migrate downward and helium migrate upward. Thick interbedded gypsum-tight limestone on the top of Lower Carboniferous is the regional caprock preserving helium-rich gas reservoir.
- Subjects
GAS wells; GAS reservoirs; HELIUM; CARBONATE reservoirs; BASEMENTS; SANDSTONE; GRANITE; CAP rock; DEVONIAN Period
- Publication
Natural Gas Geoscience, 2023, Vol 34, Issue 10, p1801
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2023.05.008