Method for reservoir assessment by calculating logging porosity while drilling by utilizing data during micro drilling

The invention discloses a method for reservoir assessment by calculating logging porosity while drilling by utilizing data during micro drilling. The method comprises the following steps of: (a) collecting data during the micro drilling of drilled wells; (b) establishing a correlation model of the data during the micro drilling and formation porosity data by combining the data during the micro drilling of the drilled wells and the corresponding formation porosity data; (c) according to the established correlation model of the data during the micro drilling and the formation porosity data, calculating the logging porosity while drilling by utilizing data during the micro drilling of a well drilled at present; and (d) setting a formation porosity of a conventional dense lithological section to be a default which is lower than the lower limit standard of the formation porosity by combining with cutting logging data to finish the reservoir assessment. According to the method, the calculation of the logging porosi