Fig. 1 Complex resistivity (a) and impedance phase (b) curves for sandstone, carbonaceous shale and organic-rich shale
Fig.2 Corresponding relationship between total organic carbon content (TOC) and resistivity of organic-rich shale in Upper Yangtze (a: core, b: logging)
The shale gas revolution in the United States has not only changed the energy landscape of the United States, but has also set off an upsurge of shale gas research around the world. China is known as one of the countries with the greatest potential for shale gas resources in the world. The Upper Yangtze region has more than half of China’s shale gas recoverable resources and is the main battlefield for shale gas exploration and development in China. However, the complex terrain and geological conditions in the area have restricted the application and effect of seismic exploration, making the electromagnetic exploration method one of the major shale gas exploration and evaluation methods. However, the study of shale gas electromagnetism, which is the basis of electromagnetic prospecting, started relatively late. The electromagnetic characteristics and mechanism of the Upper Yangtze shale gas have not yet been clearly understood. This has, to a certain extent, restricted the popularization and application of electromagnetic methods. Exploration effect.
Institute of Geology and Geophysics, Chinese Academy of Sciences, postdoctoral researcher He Lanfang, researcher Chen Ling, Professor of Chengdu University of Technology Wang Xuben, Professor of the Institute of Geology and Mineral Resources, Chengdu Institute of Geology and Mineral Resources, Wang Zhengjiang, and his collaborators revealed the page of the Upper Yangzi region through petrological and electromagnetic crossover studies. The Electromagnetic Characteristics and Genesis Mechanism of Lithogenic Abandoned - organic - rich shales . The results show that the organic-rich shale in the Upper Yangtze region has electromagnetic characteristics with low resistivity and high polarizability, and the high-polarization features are mainly manifested in the low frequency range of frequencies less than 1 Hz (Fig. 1). The classical ΔlogR-TOC model is not suitable for description of total organic carbon (TOC) in the upper Yangtze region. TOC content of organic-rich shales in the Upper Yangtze region is inversely proportional to resistivity (Fig. 2). Impedance phase (representing polarizability) can be used to characterize the petrological characteristics of organic-rich shales and is positively related to TOC and pyrite content. For the first time, this study found that there is a positive correlation between quartz content and impedance phase. Since TOC, quartz content, and pyrite content are all key factors in the evaluation of shale gas, the study of rock electromagnetism can establish a link between electromagnetic anomalies of shale gas and reservoir evaluation, and develop shale gas based on this. New method of dessert recognition.
The results of this study were recently published in the journal Geophysics (He et al. Electrical properties and its correlation to the petrology of the Upper Yangtze organic shales. Geophysics, 2017, 82(4): D199-D209).
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