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| Study of pore features in Chang7 tight oil reservoir, Yanchang layer,Ordos Basin |
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YOU Yuan1,2, NIU Xiaobing1,2, FENG Shengbin1,2, WANG Fang1,2, WANG Chengyu1,2, LI Weicheng1,2
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(1.National Engineering Laboratory of Exploration and Development of Low-Permeability Oil-Gas Fields, Xi 'an 710018, China;2.Research Institute of Exploration and Development of Changqing Oilfield Company, PetroChina, Xi 'an 710018, China)
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| Abstract: |
| The pore features of Chang7 tight oil reservoir, Yanchang layer, Ordos Basin, were studied using new pore measuring methods, such as FESEM, Micro-CT, QEMSCAN, MAPS, and were comprehensively analyzed combining conventional testing results. The results show that pores in tight oil reservoir are found continuously distributed from micro- to nano-scales. Pores being larger than 2 μm in radius constitute the primary reservoir storage space. The main types of pores are residual intergranular pores and dissolved pores. Different scale of pores and throats are well connected as a net, which works as effective flow channels for fluid. Fine-grained lake deposition and subsequent complex diagenesis characterized by strong compaction, strong cementation and strong solution, are the main reasons that micro-pores exist extensively in Chang7 tight oil reservoir. As the results of superior configuration relationships between the source and the formation and the high pressure injection condition, Chang7 tight oil reservoir is well saturated with oil. |
| Key words: Ordos Basin tight oil Chang 7 oil-bearing layer fine-grained sediment Nano-pores |
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