Controlling effect of source-reservoir configuration model on tight oil enrichment in freshwater lacustrine sedimentary area:a case study of the Jurassic Da’anzhai Member in Sichuan Basin
Huang Dong1, Duan Yong2, Yang Guang1, Yan Weipeng3, Wei Tengqiang1, Zou Juan1, Wang Wei4, Li Yucong1
1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Sichuan Chengdu 610041, China;
2. Department of Science and Technology, PetroChina Southwest Oil & Gas Field Company, Sichuan Chengdu 610500, China;
3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
4. College of Energy, Chengdu University of Technology, Sichuan Chengdu 614205, China
The Jurassic Da'anzhai Member in Sichuan Basin is a type of typical freshwater lacustrine facies, and the pre-evaluated tight oil resources is as high as 9×108 tons, indicating a great prospect of exploration and development. Based on the analysis of source rock and reservoir characteristics in combination with a large number of production dynamic data, this study emphatically analyzes the controlling effect of source-reservoir configurations on tight oil rich area in the freshwater lacustrine sedimentary area. The results show that the relationship between source and storage in this area is controlled by five categories of sedimentary microfacies, i.e., lower thick reservoir-upper thin source, upper thick reservoir-lower thin source, thick reservoir sandwiched with thick source, thin reservoir sandwiched with thick source, and source-reservoir lateral contact. The laboratory simulation shows that the source-reservoir spatial configuration is the key to control the enrichment of tight oil. The exploration and development practice in typical oil fields reveals that the lower thick reservoir-upper thin source under lacustrine sedimentary facies belt is the optimal configuration type, followed by the thick reservoir sandwiched with thick source under shallow lacustrine sedimentary facies belt, whereas the thin reservoir sandwiched with thick source under semi-deep lacustrine sedimentary facies belt is relatively poorer. According to the above source-reservoir configuration models and current exploration and development practice, it can be obtained that the lacustrine sedimentary facies belt is the exploration area for tight oil, while the semi-deep lacustrine sedimentary facies zone is the exploration area of shale oil and gas. The above knowledge lays a solid foundation for the exploration, development and evaluation of tight oil and shale hydrocarbons in this area.
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Huang Dong, Duan Yong, Yang Guang, Yan Weipeng, Wei Tengqiang, Zou Juan, Wang Wei, Li Yucong. Controlling effect of source-reservoir configuration model on tight oil enrichment in freshwater lacustrine sedimentary area:a case study of the Jurassic Da’anzhai Member in Sichuan Basin[J]. Acta Petrolei Sinica, 2018, 39(5): 518-527.
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