Dongying formation of Xiaowa area is divided into two reservoirs and 15 small layers. According to the large microscopic and macroscopic geological features, the microfacies of small layers belongs to river\|delta\|lake sedimentary system. This area mainly developed river mouth bar, delta front sheet sand and prodelta facies. Because of a good match of sedimentary and structural conditions, a good oil and gas reservoir was developed in this area.
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