Source–reservoir chart for tight oil sweet spots evaluation and its application in Permian of Jimsar Sag, Junggar Basin

Sweet spots control the production of the tight oil reservoir, so sweet spots evaluation is a critical work for tight oil exploration and development. This paper proposes a source–reservoir chart method for tight oil sweet spots evaluation and an application in Permian of Jimsar Sag, Junggar Basin. Firstly, the evaluation chart is plotted based on the relationships between the TOC and Ro parameters of source rocks, the porosity and the oil saturation of reservoirs through the experimental data of hydrocarbon generation simulation and mercury injection. Secondly, according to the evaluation criteria of TOC, Ro of source rock and porosity, oil saturation of reservoir in the study area, the chart is divided into three sweet spots zones and a non-sweet spots zone. Finally, each grid of the study area is assigned parameters and plotted in the chart of different zones, and the sweet spots are mapped. Production data show the reliability of the evaluation results. This method provides a convenient and efficient procedure for evaluating sweet spots of tight oil based on integrating the quality of source rocks and reservoirs.