Abstract
Wuerxun-Beier sags are two important oil-enriched sags in Hailar Basin, and Nantun Formation is the main layer of source rock. In this study, the Nantun Formation is subdivided into 8 sub-layers. Based on a large number of core observations and thousands of core samples, the quality of source rocks is finely evaluated by combining organic geochemical analysis and logging evaluation method (ΔLogR method), and the lower part of the Nantun Formation is identified as the high-quality source rock distribution layer. The evaluation criteria of high-quality source rocks are established. Based on the fine evaluation of source rocks, the hydrocarbon generation and expulsion potential of source rocks in Wuerxun-Beier sags are recalculated, and provides a reliable basis for resource prediction. The fine evaluation system of source rocks established in this study has guiding and referential significance for fine evaluation of source rocks in other sags of Hailar Basin.
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