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The shale in Member 3 of Shahejie Formation, western Liaohe sag was taken as the research object. Based on core observations and experimental analyses including organic geochemistry, mineralogy, SEM, isothermal adsorption etc., the forming conditions of continental shale gas were analyzed and discussed, focusing on main-controlling geological factors for the gas-bearing property of continental shale and the differences in development conditions of marine-continental shale gas. Research has shown that the mudstone/shale in Member 3 of Shahejie Formation, western Liaohe sag is characterized by large sedimentary thickness, high abundance of organic matter, diversity of organic matters, low degree of thermal evolution, good reservoir physical property and high gas content, thus providing a basic geological condition for the formation of continental shale gas. In addition, gas-bearing property of shale is …