Oil Detailed Classification and Oil-source Correlation of Mesozoic Lacustrine Oil in Ordos Basin(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2016年第02期
- Page:
- 196-205
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Oil Detailed Classification and Oil-source Correlation of Mesozoic Lacustrine Oil in Ordos Basin
- Author(s):
- YANG Hua; ZHANG Wen-zheng; PENG Ping-an; LIU Fei; LUO Li-rong
- 1. National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Fields, Xi’an 710018, Shaanxi, China; 2. Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, China;3. Research Institute of Petroleum Exploration and Development, Changqing Oilfield Company, PetroChina, Xian 710021, Shaanxi, China; 4. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
- Keywords:
- organic geochemitry; 17α(H)-diahopanes; biomarker; carbon isotope of monomer hydrocarbon; oilsource correlation; source rock; Ordos Basin
- PACS:
- P618.13;TE122.1+14
- DOI:
- -
- Abstract:
- The oil detailed classification and oil-source correlation are important topics for organic geochemistry in petroliferous basins. Analysis with GC-MS reveals that the relative abundances of 17α(H)-C30 diahopanes (C* 30) are various both in Mesozoic Yanchang Formation lacustrine source rocks and oils of Ordos Basin. Correspondingly, the contents of rearranged sterane, C29 Ts and Ts are also different. Therefore, according to the abundance of C* 30,such as the diagrams of C* 30/C29 norhopane valueC* 30/C30hopane value and C29Ts/C29 norhopane value-C* 30/C30hopane value, the Mesozoic lacustrine oil can be divided into three genetic types including exceptional richness of C* 30, relative richness of C* 30 and lower C* 30 contents. By studying the distribution of sterane and terpane biomarkers in oil-source rock with relevant parameters, and carbon isotopic compositions of monomer hydrocarbon, based on source rock distribution and reservoir forming combination, it has been proved that Chang-7 highquality sources are the main oil source rocks in Mesozoic reservoirs of Ordos Basin, and the black mudstones of Chang-7 and Chang-9 are the secondary source rocks, while the contribution of dark mudstone of Chang-6 and Chang-8 is limited. In conclusion, the Mesozoic oil supply is characterized by “one source is dominating, multiply sources are participated”. This study is significant in Mesozoic resource assessment and further exploration of Ordos Basin.
Last Update: 2016-03-28