LI Chun-Rong,
RAO Song,
HU Sheng-Biao et al
.2017.Present-day geothermal field of the Jiaoshiba shale gas area in southeast of the Sichuan basin, SW China.Chinese Journal Of Geophysics,60(2): 617-627,doi: 10.6038/cjg20170216
Present-day geothermal field of the Jiaoshiba shale gas area in southeast of the Sichuan basin, SW China
LI Chun-Rong1, RAO Song2, HU Sheng-Biao1, WANG Ji-Yang1, WEI Zhi-Hong3, HUANG Qing-Qiu3, HU Dong-Feng3, GUO Xu-Sheng3
1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Yangtze University, Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Wuhan 430100, China; 3. Sinopec Exploration Southern Company, Chengdu 610041, China
Abstract：The Sichuan basin is an important oil and gas bearing basin in China. There have been several reports on the present-day geothermal distribution of the Sichuan Basin in general. However, little effort has been made to characterize the geothermal field in details for the Jiaoshiba Shale Gas Area in the Southeastern Sichuan Basin where breakthrough of shale gas exploration has recently been made. Combining existing data with 3 new borehole temperature profiles and thermal conductivity measurements of 118 rock samples, this paper presents a heat flow contour map of this area. It turns out that the Jiaoshiba Shale Gas Area has a relatively high geothermal gradient value of 24~34℃/km and heat flow value of 60~70 mW·m-2, comparable to the heat flow of the uplifted central district of the Sichuan Basin. The main cause of this phenomenon is the lateral heat transfer towards the uplifted areas due to the difference of the rock thermal conductivities. Another reason is the thermo-tectonic activities of the Qiyue Mountain Fault at the east boundary of the Sichuan Basin during the Yanshan and Himalayan Epochs. The high geothermal anomalies in the Jiaoshiba Shale Area is beneficial to the recovery ratio of shale gas because high temperature can promote desorption rate.
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