《Table 1 Porosity and permeability of shale in the Hengtongshan Formation of the Tonghua Basin》

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《"Characteristics and Evaluation of the High-Quality Source Rocks of Cretaceous Continental Shale Oil in Tonghua Basin, China"》

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Note:Test method is mercury intrusion porosimetry（MIP）.

The Tonghua Basin is a typical continental lacustrine basin，and the following issueshave become important research goals:whether the Tonghua Basin has a good material base and stable lacustrine sedimentary environment and whether the Tonghua Basin experienced conditions favorable for the formation of shale oil with a high exploration value.Although basic geological studies，such as detailed gravitational and magnetic exploration，have been conducted in some areas of the Tonghua Basin recently（Wang Yubo et al.，2011），these studies suffered from limited exploration，weak research，unclear resource potential，unclear exploration direction and uncertain petroleum resource prospects.As the first geological survey well in the Tonghua Basin，the TD-01 well represents an important breakthrough in research on the Tonghua Basin.Evidence of petroleum was detected for the first time in the drilled strata of the Hengtongshan Formation，and oily cores were successfully recovered.These findings revealed for the first time that shale is present in the strata of the Hengtongshan Formation.The shale contains high organic matter with characteristic of low porosity and permeability（Fig.1；Table 1）.The shale provides a high-quality source rock and contains tight reservoirs of shale oil.The above findings provided the basis for studying the characteristics and reconstructing the formational environment of the high-quality source rocks in the Hengtongshan Formation and provided more precise information for use in researching the shale oil in this formation.Therefore，organic geochemical tests were conducted on the newly discovered source rocks from the Hengtongshan Formation，and the high-quality source rocks and their formational environment were studied in combination with the geological drilling data（Wang Dandan et al.，2017）.The aim was to promote a breakthrough in petroleum exploration in the Tonghua Basin as well as in other Mesozoic residual basin groups in eastern Jilin Province.