- Tytuł:
- 准噶尔盆地南缘西段下部成藏组合油气藏形成过程 ——以独山子背斜独山1 井为例. (Chinese)
- Autorzy:
- Temat:
-
HYDROCARBON reservoirs
PETROLEUM prospecting
OIL fields
LIQUID hydrocarbons
GAS reservoirs
PETROLEUM reservoirs
PETROLEUM
HEAVY oil - Alternatywny tytuł:
- Reservoir formation process of the lower accumulation assemblage in the west part of the southern Junggar Basin：Case study of Well Dushan1 in the Dushanzi anticline. (English)
- Źródło:
- Natural Gas Geoscience; Jul2021, Vol. 32 Issue 7, p1009-1021, 13p
- Abstract (English):
- The basic petroleum geological conditions of large oil & gas fields formation is favorable for the lower accumulation assemblage in the southern Junggar Basin, where the degree of exploration and research is relatively low. Thus there is great significance for oil and gas exploration to further clarify the formation process of oil and gas reservoirs. Hydrocarbon accumulation process of the lower accumulation assemblage of the Dushanzi anticline in the southern Junggar Basin was investigated using an integrated fluid inclusion, quantitative grain fluorescence, total scanning fluorescence analysis, the oil and gas characteristics in combination with well burial history simulation, hydrocarbon generation and expulsion history, structural evolution analysis and reservoir forming chronology analysis techniques in the area. The results show that: (1) There are two stages of hydrocarbon inclusions in Toutunhe Formation reservoir in Dushanzi anticline. The first stage is yellow or yellowish brown fluorescent liquid hydrocarbon inclusions, and the hydrocarbon is mainly low mature crude oil. The low abundance of inclusions in this stage indicates that the oil and gas filling intensity is low, and no large-scale oil and gas reservoir was formed. The second stage is mature to high mature light oil inclusions with blue fluorescence, and the abundance of inclusions is high, which was the key reservoir forming stage. (2) The concentration of adsorbed hydrocarbon on the surface of some reservoir particles (6 416 m, 6 493 m) in Toutunhe Formation of Well Dushan-1 is relatively high. The adsorbed hydrocarbon is mainly low-density light oil. Heavy oil with high asphaltene and asphaltene can also be seen in the reservoir. It is considered that the reservoir had been damaged and adjusted to a certain extent after formation. (3) The hydrocarbon charging of Toutunhe Formation in Dushanzi anticline started in the Early Paleogene, but the amount was limited, and no large-scale oil and gas reservoirs were formed. Until the Miocene (5-3 Ma), the intensity of hydrocarbon generation and expulsion of source rocks was significantly enhanced, and the oil and gas were rapidly charged and formed reservoirs. The early paleo-reservoirs are residual oil layers with different hydrocarbon saturations, and some of them have high saturations (6 416.9-6 417.4 m, 6 493-6 493.5 m). It is speculated that industrial oil flow can be obtained by oil testing. [ABSTRACT FROM AUTHOR]
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