Seismic facies and the distribution of the intraplatform shoals in the Ordovician Yingshan Formation in the Ka-1 three-dimensional seismic area, Central Tarim Basin, Xinjiang

The Ordovician Yingshan Formation in Central Tarim Basin, Xinjiang is interpreted as the favourable target horizons for the petroleum exploration in the marine carbonate rocks. The seismic reflection configurations and spatial distribution of the intraplatform shoals in the Ordovician Yingshan Formation in the Ka-1 threedimensional seismic area are based on the core examination, well logs and seismic data. These intraplatform shoals have high-frequency disordered seismic reflection waves, highly varied amplitudes, and sharp changes of the stratigraphic thickness on both sides, wide and gentle lenticular or mound seismic reflection configurations, and overlapping or draping of the wall rocks around the intraplatform shoals upon the intraplatform shoals. The palaeomorphological features are reconstructed for the Yingshan Formation, and the favourable areas are delineated for the intraplatform shoals in the Formation. The results of research in this study will provide the basic information for the assessment of the high-energy shoal reservoir rocks in the study area.