On Genetic Type and Reservoir Quality of Jurassic Sands in Hinterland of Junggar Basin

There exist many types of genetic sandbodies of Jurassic in hinterland of Junggar basin, in which submerged distributary channel sandbody in delta front subfacies is the major reservoir. The different kinds of genetic sandbody show the different superimposed structures. The sandbody of J1S22 is of split planar texture, while the rest sequence sandbodies are dominated by labyrinth-like ones. The size grade of each genetic sandbody mainly controls the sandstone physical properties. The coarse-grained sandbody shows better property, depending on the depth. The petrophysical property of channel mouth bar in moderate-shallow depth are good as that of submerged distributary channel sandbody; however, that of submerged distributary channel sandbody in deep-intermediate depth is better than that of the mouth bar sandbody; and that of super-deep sandbody shows little variation.