Sedimentary Microfacies Research On Huoshaogou Member And Jianquanzi Member Of Baiyanghe Formation In Danbei Oil Field

Danbei oil field is located in a unapparent noselike structure in the northern slope belt of Jiuxi Depression in Jiuxi Basin.The E3h2+3of Huoshaogou formation is the main producing bed.The production of Danbei oil field is decrease and the water content is increase after50years of oil production period.So we need to make clear the unknown sedimentary microfacies characteristics and the distribution of sandstones.The study divide the objective horizon accurately for the more cccurate research achievement.We select N1b1-E3h3,E3h3, E3h2and E3h3-E3h2as the marker bed.And divide the objective horizon into N1b1,E3h3,E3h2three sub layers.Then longitudinal compared and correct the divided result by combining standard wells with stratigraphic correlation diagram throughout the study area.Applied the modern sedimentological theory,combined the structural and tratigraphic analysis,geophysics,geochemistry and basin analysis,kinds of theories and methods, based on the outcrop and core data and logging data,we get many achievements. Jianquanzi member (N1b1) of Baiyanghe formation mainly develop delta depositional system which can be further confirmed to delta front subfacies.It develop subaqueous distributary channel and distributary interchannel. Huoshaogou formation (E3h2、E3h3) develop alluvial fan deposit in the northern study area which can be further confirmed to fan end deposition subfacies.It develop braided channel and sheetflood. The depositional environments are transition southward to braided channel deposition which develop channel sand dam and flood land microfacies.