Abstract: Shale oil, as one of the important fields in unconventional oil and gas exploration and development, has gradually become a major research object for domestic and foreign oilfields. We take the Chang 7 sections of the Qingcheng Oilfield as the research objects, which pose many difficulties such as strong heterogeneity of the reservoir, numerous vertical interlayers, and that in characterizing geological sweet spots. The four-property evaluation using logging data has a long history and can quantitatively characterize geological sweet spots from the wellbore. However, with the continuous deepening of exploration and development practices, the evaluation of geological sweet spots only from the wellbore perspective can no longer meet the needs of the oilfield. In response to this situation, the logging-while-drilling gamma imaging is used to analyze the positional relationship between the wellbore trajectory and the formation and calculate the formation dip angle. The logging-while-drilling resistivity probe is used to determine the boundary range of the formation and pick up the changes in the structural dip near the wellbore. The logging-while-drilling nuclear magnetic resonance is used to accurately measure the porosity and fluid saturation of the reservoir in real time and evaluate the physical properties of the reservoir, forming a geological sweet spot evaluation technology around the wellbore for shale oil. This technology has important guiding significance in the geological steering and perforation cluster optimization of horizontal wells in the Qingcheng Oilfield's shale oil, and has good promotion value in other unconventional oil and gas reservoirs.

Key words: shale oil, geological sweet spots around the well, logging-while-drilling imaging, geosteering, perforation cluster optimization