Summary
Lucaogou formation in Jimusar sag consists of shale, argillaceous sandstone, sandstone, dolomite and dolomitic mudstone of lake-delta facies. It can be divided into two pay zones: "upper sweet spot" and "lower sweet spot". Several wells were drilled into the formation and encountered the "upper sweet spot" in recent years, some of them achieved high oil production, showing a good exploration prospect for the Permian Lucaogou formation, but there are still some wells with relatively low productions. In order to understand which factors restrict the well productivity, we combined the surface seismic attributes with the micro-seismic results and analyzed the factors that affected oil and gas productivity in detail. Based on our study, we concluded that the geophysical responses in high oil production area are characterized by weak seismic P-wave amplitude and none-coherence attribute. The areas with low coherence value are suitable for applying hydraulic fracturing treatment. This provides geological basis for the next favorable area optimization, and the optimized project design for reservoir stimulation.
