A Study of the Accumulation Periods of Low Permeability Reservoir of Yanchang Formation in Longdong Area, Ordos Basin
详细信息
- 责任者：Fu Jinhua (Changqing Oilfield Company ; PetroChina ; Xi’an 710021 ; China) ; Liu Guangdi
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(2)
- 页码：p.125-131
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The hydrocarbon accumulation time of Yanchang Formation in Longdong Area is determined according to the characteristics of fluid inclusion,combined with the hydrocarbon generation history of source rock and oil maturity.The characteristics of fluid inclusion under microscope and UV fluorescence suggest that there are two periods of hydrocarbon inclusion.The first stage of hydrocarbon inclusion is dust or dark brown liquid hydrocarbon inclusion under polarized light microscope,its abundance is low,and the homogenization temperature of accompanied saline inclusions is 75—95℃.The second stage of hydrocarbon inclusion is mainly gas and liquid hydrocarbon inclusion,the liquid is colorless or light yellow under polarized light microscope and light yellow to bluish green under fluorescence microscope,its abundance is high,and the main peaks of homogenization temperature of accompanied saline inclusions are 75—95℃ and 100—120℃.Three periods of hydrocarbon accumulation are showed: the early period of low mature oil charging in a small scale at 140—130 Ma,the middle period of mature oil accumulating in a large scale at 120—100 Ma corresponding to the peak of hydrocarbon generation,and the late period of adjusting accumulation at 100—40 Ma.