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Mechanism analysis and logging evaluation of low resistivity in lower Paleozoic shale gas reservoirs of Yangtze region
SUN Jianmeng, XIONG Zhu, LUO Hong, ZHANG Hongpan, ZHU Jinjiang
(School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China)
Abstract:
To resolve the problem of abnormal low resistivity in shale gas reservoirs in the process of shale gas exploration and development in Yangtze region, and to improve the accuracy of logging evaluation, the formation mechanisms of low resistivity of shale gas reservoirs are studied. Firstly, through the analysis of geology and logging response characteristics of low resistivity shale gas reservoirs, in combination with core data, the causes of low resistivity are inferred. Then, using the actual shale gas reservoir logging data obtained in Yangtze region, the causes of the low resistivity are analyzed. The mechanisms of low resistivity include six factors:high clay content, over-mature organic matter, high pyrite content, high degree mineralization of water, poor development of reservoir properties and excellent geological conditions. These factors intervene with each other, and work together. In different regions and reservoirs, the main controlling factors are different. By comparing adjacent wells and differences in the upper and lower intervals, it helps to identify the main causes of the low resistivity and to improve the accuracy of logging interpretation evaluation.
Key words:  shale gas  resistivity logging  low resistivity shale  logging evaluation