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The oldest oil accumulation in China: Meso-proterozoic Xiamaling Formation bituminous sandstone reservoirs.
The oldest oil accumulation in China: Meso-proterozoic Xiamaling Formation bituminous sandstone reservoirs.
- Source :
- Petroleum Exploration & Development; Aug2011, Vol. 38 Issue 4, p503-512, 10p
- Publication Year :
- 2011
-
Abstract
- Abstract: Based on analysis on the coexistent relationship between igneous rock intrusion and bituminous sandstone of the Xiamaling Formation in northern Hebei (Qnx), the accumulation time of the Xiamaling Formation bituminous sandstone reservoir is defined by the methods of organic petrology and isotope chronology. According to field investigation, observation of thin-section and the shallow drilling show, and based on the previous results of oil seepages and bitumen spots in the Qnx base sandstone, thirty-one new oil seepages (bitumen spots), including twenty-one visible black bitumen spots, were discovered in the Qnx. The distribution of paleo-reservoirs in the Qnx bituminous sandstone was identified, and 4 paleo-reservoirs, i.e. Shuangdong paleo-reservoir in Pingquan, Longtangou paleo-reservoir in Lingyuan, Lujiazhuang paleo-reservoir and Tashan paleo-reservoir in Kuancheng, have been named. The reserves of the paleo-reservoirs are 0.7-1.0 billion tons, which are calculated by the volume method with the solid bitumen content. Organic petrology analysis shows that two kinds of solid bitumen with diferent reflectivity characteristics were developed. Class structure of natural coke is discovered in solid bitumen, which is the first direct evidence to prove that severe thermal alteration occurs in the Qnx base sandstone bitumen. The age of Qnx gabbro-diabase baddeleyite by SHRIMP U-Pb dating is 1 327 Ma±2 Ma, which indicates that the accumulation time of the Xiamaling Formation bituminous sandstone is 1 400 Ma to 1 327 Ma. So, it is the oldest oil accumulation in China. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 20964803
- Volume :
- 38
- Issue :
- 4
- Database :
- Supplemental Index
- Journal :
- Petroleum Exploration & Development
- Publication Type :
- Academic Journal
- Accession number :
- 66310483
- Full Text :
- https://doi.org/10.1016/S1876-3804(11)60050-5