The Jurassic system in the central Junggar Basin mainly developed various deposits including braided river, delta and lake facies, and their rocks are mainly lithic sandstones and feldspathic litharenites. Strong compaction is the most important diagenesis to control reservoir qualities in the study area. Based on comprehensive investigation of casting thin sections and physical properties of rocks, the present paper proposed that there was a high-quality sandstone reservoir zone with relatively high porosity and permeability at the depths of 3500m to 4500m in the Mosuowan region and this deep burial high-quality reservoir zone was identified as a primary porosity zone rather than a secondary dissolution porosity zone. The combination of logging data indicated that there was an uncompacted belt in the Mosuowan region and anomalies of high acoustic interval transit time and low resistivity occurred in the uncompacted belt of wells Mo-13, Mo-15 and Pen-5. Overpressure resulted from uncompaction had greatly reduced the effect of a normal compaction on deep strata, significantly resulting in the development of high-quality reservoirs in deep strata of this area. The distribution of uncompacted sandstone reservoirs in the study area showed an obvious tendency, i.e. the lower the sand-to-shale ratio, and the thicker the depth of mudstones, the more readily the uncompacted sandstone reservoirs develop.
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2011, Vol. 32 
