A Research on ESR Dating of Minerals in Fractures of Upper Triassic Xujiahe Formation in Guang’an Structure, Central Sichuan Basin
详细信息
- 责任者：Ou Lihua (Institute of Sedimentary Geology ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Shi Zhiqiang
- 刊名：Computing Techniques for Geophysical and Geochemical Exploration
- 出版年：2010
- 卷期：32(3)
- 关键词：裂缝性油气藏 ; fractured reservoir ; ESR定年 ; ESR dating
- 页码：p.265-269
- 图表：3 illus., 1 table, 19 refs.
- 分类号：1003
- issnNo：ISSN1001-1749
- isbnNo：CN51-1242/P
摘要
Fractures were important for tight sand reservoir of Upper Triassic Xujiahe Formation in Guang’an region, Sichuan Province. Based on the dates of ESR measurement of quartz and calcite minerals in fractures, it was estimated that fractures formed in three periods, about 93.4 ~74.3 Ma, 38.7 ～34.2 Ma and within 10 Ma.The first period occurred while the late Yanshanian movement developed, in which tension fissures formed and were associated with wrinkle. Then the fractures connected the hydrocarbon source rock and tight sand reservoir, and had a constructive role for the formation of gas reservoir. The second period happened about in the 1st episode of Himalayan movement, which associated with faults formed along with rapid uplifting of the whole Sichuan Basin. The fractures had broken the older traps and had some destructive effect for the gas reservoir. The third period happened in the 2nd episode of Himalayan movement, after the destructive effect of the second-period fractures, which improved the reservoir property and permeability in somewhat, and had an adjusting and shaping effects for the gas reservoir.
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