Logging Evaluation Technologies Of Continental Tight Sandstone Reservoir In Beiyuanba Area Of East Sichuan Basin

With poor petrophysical property, strong heterogeneity, complicated reservoir spaces and various fluids etc. in continental tight sandstone reservoir in Beiyuanba area of east Sichuan Basin, where the well logs in this area loses quality, the calculating precision of porosity and permeability decreases seriously and difference emerges between logging evaluation and well testing. Aiming at above problems, a set of logging evaluation methods for continental tight sandstone reservoir is formed finally. Firstly, through analysis on responsing characteristics of log curves of different rock types to set up the reservoir identification methods. Secondly, using interpretation method mainly as "Core Scale Logging" to confirm the method reasonability of calculating mineral content, pore structure and gas saturation, thirdly, using a variety of methods to recognize reservoir fluids combining rock mechanical parameters after MPAL. Finally,.on the base of petrophysical results, combining well logging and well testing, fine processing, interpretation and evaluation work of 10 wells were finished. This method has received obvious effect in Beiyuanba area, with the interpretation precision and interpretation coincidence rate improved highly.