Geochemical Characteristics of Kerogen in Yanchang Formation Source Rocks, Xifeng Area, Ordos Basin
详细信息
- 责任者：Ji Liming (Key Laboratory of Gas Geochemistry ; Institute of Geology and Geophysics ; CAS ; Lanzhou 730000 ; China) ; Wu Tao
- 刊名：Petroleum Exploration and Development
- 出版年：2007
- 卷期：34(4)
- 关键词：烃源岩 ; source rocks ; 干酪根 ; kerogen ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.424-428
- 图表：4 illus., 2 tables, 15 refs.
- 分类号：1003
- issnNo：ISSN1000-0747
- isbnNo：CN11-2360/TE
摘要
The kerogeffs maceral, elements and carbon isotopes in the Chang 7 and Chang 8 source rocks of the Yanchang Formation, Xifeng area, southwestern Ordos Basin, suggest that the organic matter types in the Chang 7-2 and Chang 7-3 are good, containing sapropel and sapropel-humic kerogens, which are formed in a deep lake with a reducing environment and indicate algae input in productive period. The Chang 7-3 source rocks contain many terrestrial plant remnants due to turbidite sediments. The Chang 8 source rocks have worse organic matter type, mainly mixed type, formed in a shallow lake, with both terrestrial plant remnants and some algae input. Because of the difference of the sedimentary and preservation environments, the Chang 8 source rocks at some wells have mainly humic kerogen. The source rocks of the Chang 7-2 and Chang 7-3 have good potential for oil and gas, and are probably the main source for the oil reservoirs.