VERTICAL AND HORIZONTAL DISTRIBUTION OF TIDAL CHANNEL SAND BODY IN PINGHU OILFIELD IN THE EAST CHINA SEA

The tidal channel sand body is one of the most important reservoirs in the tidal flat depositional system. Using the modern analogue and flume experiment results as guides, according to the data from coring, analysis, testing, logging and seismic inversion, we established the characteristics of tidal channel sand body both vertically and horizontally for the Pinghu Formation in the Fangheting area of the Pinghu Oil field. The results show that the tidal channel sand body is thick and coarse, with typical beddings formed under strong hydrodynamic conditions in the tidal environment. Modern sedimentary observation and flume experiments indicate that tidal channels are distributed in a dendritic pattern. Towards the land, they become narrower in shape, smaller in scale and larger in width-depth ratio, indicating the bifurcation of tidal channels. Both seismic and drilling data are used in this case to define the distributional features of tidal channel sand bodies. The results accord well with the modern analogue and the flume experiment results.