Reservoir Characteristics And Favorable Area Prediction Of The Chang6Reservior In Nan111Wellblock In Nanniwan Oilfield

In this paper, the chang6reservoir in Nan111wellblock in the Nanniwan oilfield in ordosbasin is the research object, through the study in stratigraphic division, structural features, thefeature of the sedimentary facies, sedimentary facies and the sand bodies’ distribution on theplane of the chang6reservoir, have a detailed study for the main oil-bearing horizon chang6on the reservoir petrology characteristics, diagenesis and the pore structure, also make aReservoir classification and a comprehensive evaluation, and analyzes the reservoir type, oiland gas enrichment regularity, to grasp the distribution characteristics of the chang6reservoirand synthesize the main control factors and the testing, pre-production data to make theprediction of favorable zones.According to the rock types, sedimentary structure, sedimentary cycle, lithology,electrical response characteristics, the logging data, drilling core observation and othermethods, to identify that the chang6reservoir in research area major developed the delta plainsubfacies.Research chang6sandstone are mainly medium-fine sandstone in gray, celadon andtaupe feldspar, the filler content is less and mainly for cement. In the cement are mainlychlorite, calcite and laumonite, followed by illite, quartz and feldspar overgrowth, etc. Theholes in sandstone are given priority to primary intergranular pore, feldspar dissolution pore,laumonite dissolution pore, intragranular pore and fracture aperture, the main developed holestructure are small the hole-micro throat and the fine hole-micro throat. The study area isgenerally in low porosity, low permeability reservoir.Reservoir is a typical elastic-dissolved gas drive lithologic reservoir, oil enrichmentcontroled by sedimentary environment, diagenesis and nose-like structure factors,etc.Throughthe study on reservoiring condition and oil enrichment regularity, comprehensive the testingand production data, selected two, four and three favorable exploration blocks respectively in61,62and63these three main oil-bearing layer, superimposed on the longitudinal into sixblocks, provide geological basis for further exploration deployment.