Research On The Characteristic Of Reservoir And The Rule Of Reservoir-formed In Chang 6 Oil Reservoir In Yizheng Area Of Southern Of Zhidan Oil Field

On the basis of making full use of oil testing data, logging data, well logging information, and analysis assay data of Zheng 316 well area, combining with common slices, casting thin sections, scanning electron microscope observation, X-ray diffraction and cathodoluminescence, the thesis conducts a detail research of petrology characters, reservoir space features, diagenesis characters and diagenetic evolution history, pore structure characteristics and physical properties’ plane distribution characteristics, etc. The results show that the main types of Chang6 Formation sandstone is arkose; the main space types are dissolved pores between grains, dissolved pores in grains and intercrystalline pores; diagenesis and the diagenetic evolution are complicate, and now the reservoirs are in mesogenetic A-B stage; the reservoirs are with small pore-throat, poor sorting, and high displacement pressure; the porosity and permeability are low; the physical properties differ sharply in horizontally,which have a big influence by sedimentary facies and diagenesis.With comprehensive analysis and summary of the Petroleum accumulation condition, oil and gas reservoir master control factors and reservoir types,found that the most important conditions are source rock condition, reservoir condition,and source-reservoir-cap assemblage condition;and the significant control factors are sedimentary microfacies, source-reservoir-cap assemblage condition, microstructure feature,diagenesis,microcracks,and sandbody vertical overlay condition;the reservoir types concluded up-lip pineh-out sandstone lithology reservoir, sandstone lenticular-body lithology reservoir and structure-lithology composite reservoir.Based on comprehensive study, summed up and established the Chang 6 oil & gas reservoir-formed mode.Finally,forecasted the favorable oil bearing belt of Chang 6.The oli & gas reservoir-formed mode is: Chang 7,Chang 9,Chang4+5 are the major source rocks of the target area.Oil from good physical property sandbody,and microcracks to the excellent reservoirs which have thick sandbody, distributed extensively,and have good connectivity.When the oil met shelter materials with poor physical properties,which accumulated to oil reservoir.In vertical,the oil migrated like "ladder climbing ". Combined with sand body distribution,reservoir property distribution, oil and gas reservoir master control factors, test and production information forecasted the favorable oil bearing belt of Chang 61 and Chang 62,found that the best oil bearing belt are those regions with thick sandbody, good porosity and permeability and with nose fold background.