An integrated shale pore characterization method: A case study of theLower Silurian Longmaxi Formation in the Sichuan Basin

被引:0
作者
Zhang, Teng [1 ]
Zhang, Liehui [1 ]
Tang, Hongming [1 ]
Chen, Guo [2 ]
Liu, Jia [2 ]
Wang, Junjie [1 ]
Zhuo, Renyan [1 ]
机构
[1] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan
[2] Geological Exploration & Development Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, 610051, Sichuan
关键词
Early Silurian; Integration; Longmaxi age; Pore characterization; Pore distribution; Porosity; Shale; Sichuan Basin;
D O I
10.3787/j.issn.1000-0976.2015.12.003
中图分类号
学科分类号
摘要
The characterization of shale is much more difficult because of its characteristics of low porosity, strong heterogeneity and existence of the nano-scale pores. Current pore characterization methods have their own advantages and disadvantages, and they are applicable to specific ranges of pore sizes, so only one single method cannot realize accurate characterization of pores in shale. Based on the previous research results, therefore, an integrated pore characterization method was established through the integration of gas adsorption, nuclear magnetic resonance, high-pressure mercury intrusion and gas porosity after experiments were performed and all characterization methods were analyzed and compared. This method was used to characterize the pores in the Lower Silurian Longmaxi shale in the Sichuan Basin. The conclusions are reached as follows. First, the measurement result by nuclear magnetic resonance is used as the datum pore diameter distribution scale for this integrated method. Scale sections and their ratio coefficients are set by means of optimization selection, segmentations and weights, so as to optimize characterization accuracy. The obtained data are better accordant at the linking parts and pore distribution is in accordance with the related rules. Second, the integrated pore characteristics of the Longmaxi shale in the Sichuan Basin fit the geologic properties. This indicates that this method can provide not only more representative data in full pore scales, but technical support for the accurate characterization of shale pores. © 2015, Natural Gas Industry Journal Agency. All right reserved.
引用
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页码:19 / 26
页数:7
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