Abstract:Grain-beach-dolomite reservoirs developed in the Cambrian of Gaoshiti-Moxi Area in Sichuan Basin have a good gas prospect.In order to determine the distribution range of high-quality reservoirs,the Longwangmiao Formation-Xixiangchi Group are divided into four fourth grade sequences based on drilling and seismic data with the seismic stratigraphy interpretation,and four cycles of sea-level rise and fall changes are calibrated.Combined with maximum peak-amplitude attributes and formation thickness,it is considered that grain-beach-dolomite reservoirs are controlled by sea level changes and paleo-geomorphology.Among them,the development of grain-beach-dolomite reservoirs is controlled by the fourth grade of sea level fall,with a belt-like distribution.High-quality reser-voirs developed near the onlapping of sequences,and the paleo-geomorphological micro-relief variation in the near shore had more influences on reservoir physical properties.Higher positions of local paleo-geomorphology have better reservoir physical properties.The seismic stratigraphy interpretation can confirm development areas of high-quality grain-beach-dolomite reservoirs and is useful for the study of Ordovician reservoirs with similar reservoir conditions in the area.
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