Key Development Fields and Construction of Technical System for Logging of Continental Shale Oil

The research on continental shale oil has just started in China. The key development fields of logging, the link of geology-engineering integration, are not yet clear. There is no systematic establishment of a corresponding collection and evaluation technical system, which restricts the development and full exploitation of shale oil logging to a certain extent. After a systematic analysis of current status of shale oil logging and the requirements of the geology-engineering integration of shale oil, the contents, difficulties, and shortcomings of logging evaluation were analyzed in detail from the four aspects, including a quantitative analysis of mineral components and identification of favorable lithofacies while drilling, reservoir and oil-bearing property evaluation, mobility evaluation, and fracrability evaluation. It is proposed that the development of diffuse reflection infrared Fourier transform spectroscopy (DRIFTS), online nuclear magnetic resonance (NMR) logging for the oil-bearing property of drilling fluids, T₁-T₂ two-dimensional NMR logging of rock samples, and logging rock mechanics should be emphasized. On this basis, according to the principles of pertinence, effectiveness and economy, continental shale oil can be divided into two types: medium-low maturity and medium-high maturity, and the technical system for logging based on the evaluation of reservoir property, oil-bearing property, mobility, fracrability, and drillability was developed, in a way that can guide the development and production practice in shale oil logging.