The Heterogeneity in the Gas Leg and Water Leg. Two types of layers, that is, the gas leg and water leg, could be determined by the formation testing while drilling (FTWD) in the Lower Jurassic of the study area.
Several distributary channels are stacked in the water leg of well YN4 according to the cores and conventional loggings (Figure 6).
Same as in the gas leg, the sandstones with high content of igneous rock fragments or carbonate cement were more impermeable than the ones with abundant rigid framework grains or with little carbonate cement in the water leg.
According to the heterogeneity in the gas leg and water leg, we proposed four basic types of petrofacies, respectively, tight compacted (argillaceous), carbonate-cemented, gas-bearing, and water-bearing sandstones in the Lower Jurassic reservoirs of the study area (Figures 4 and 6), which correspond to the four heterogeneity units.
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