The reservoir of the Cretaceous Qingshuihe Formation in the Hongshanzui area on the northwestern margin of Junggar Basin in NW China features shallow burial depth,high yield,and many remaining productive wells,and has the potential for efficient reservoir expansion.However,the main controlling factors remain unclear today,which limited the progress in the evaluation of reservoirs.Based on an analysis of the fault and structural characteristics,and the logging data of key oil and gas wells,the oil-gas-water relationship among different wells and the oil-and-gas enrichment rules were studied in depth.Results show that the reservoirs in the Hongshanzui area are mainly controlled by multi-stage sand bodies and faults,forming fault-strata conformed reservoirs under stratigraphic onlap background in every stage of reservoir evolution in fault-delimited blocks.A new mode for this area was established for petroleum accumulation that is"controlled by faults for vertical diversion and lateral blocking,and by strata pinching out",by which the area around the center of H67 Well was determined the most favorable petroleum accumulation zone featuring multi-stage onlap and strata pinch-out.The above results are of great guiding significance for upgrading the proved reserve in the Qingshuihe Formation and promoting the production capacity buildup in the Hongshanzui area.
NETL
NSTL
维普
万方数据
