Critical Factors in Oilfield Exploration and Development: Analysis of Reservoir Sand Body Configuration

The detailed study of reservoir sand body configuration is significant to the rational exploration and development of oil fields. In order to clarify the sand body configuration of Chang 7 in Wuqi Oilfield of Ordos Basin, the sand body of Chang 7 is analyzed by core, logging and field outcrop profile data. The results show that Chang 7 mainly develops lake delta front subfacies, and the microfacies are mostly underwater distributary channels, distributary bays and estuary sand bars. The sand body structure mainly includes three types: isolated type, multi-stage vertical superimposition type and lateral superimposition type. Sedimentary microfacies are a critical factor controlling the sand body configuration. The base level change will affect the vertical stacking mode of sand bodies, and the supply rate of material source will affect the vertical connectivity of sand bodies.