Application of high-resolution sequence stratigraphy to exploration of Lower Tertiary subtle reservoirs in Jiyang Subbasin

A model for the Lower Tertiary framework and sequence system tract of Jiyang subbasin was established with the high-resolution sequence stratigraphy.The study results show that the lowstand sand bodies such as incised channel filling,lowstand wedges and fans controlled by the structural slope-break zones are favorable for forming the subtle reservoirs.The subtle reservoirs controlled by the structural slope break zones with apparent seismic reflection characteristics are apt to be identified and forecasted on the seismic profiles. The methods for subtle reservoir exploration and forecast were discussed, taking a case study of Jiyang subbasin as an example.