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Numerous geological explorations demonstrate that magmatic intrusions may increase the geothermal gradient in sedimentary basins, accelerating the thermal maturation of organic matter in strata, and promoting the hydrocarbon generation (Fjeldskaar et al., 2008; Jones et al., 2007). They may also be beneficial to the migration and accumulation of oil and gas by providing them with pathways, reservoirs, covering conditions and trapping constructions (Feng and Tang, 1997; Li, 2000; Othman and Ward, 2002; Othman et al., 2001; Wang et al., 1990). Therefore, it is of great significance to study the thermal effect of igneous intrusions on organic-rich host rocks. A lot of the organic-rich host rocks are argillaceous rocks, e.g., shales in the DSDP 41-368 hole near Cape Verde Rise in eastern Atlantic and mudstones in Xia 38 well block in the Huimin Sag of Bohai Bay, which generally have the relatively low permeability (e.g., <10-16 m2). Under such circumstances, the hydrothermal convection in host rocks can be reasonably ignored, and heat conduction models can be used to approximately describe the heat transfer in host rocks (Hanson, 1995; Hayba and Ingebritsen, 1997). Thus, these models are often used as a geothermometer to indicate the temperature range in which the thermal metamorphism of these host rocks takes place (Barker et al., 1998; Santos et al., 2009; Stewarta, 2005; Turcotte and Schubert, 1982; Wang et al., 2007, 2008). Several types of heat conduction models have been constructed and used in some geological researches (Galushkin, 1997; Wang et al., 2007, 2011). However, only a small portion of these researches specially compare and quantify the difference in the prediction results of different heat conduction models (Jeager, 1959; Galushkin, 1997; Wang et al., 2011). Due to the apparent importance of the accuracy of heat conduction models in these researches, it is still required to further explore and distinguish the applicable conditions of these models based on some geological cases. In this study, we accordingly investigate the difference in the prediction results of three types of commonly used heat conduction models by taking an intrusive sill in the Bellata-1 Well in the Gunnedah Basin, Australia as an example. These models assume different intrusion mechanisms of magma and different evolution states of pore water during cooling of magma. By comparing the prediction results of these models with the measured vitrinitereflectance (Ro) geothermometer, we also discuss the potential intrusion mechanism of the sill and the state of pore water in host rocks during cooling of the sill.

Heat-Transfer-Model Analysis of the Thermal Effect of Intrusive Sills on Organic-Rich Host Rocks in Sedimentary Basins