Reservoir Description Of Member6of Jianyucha Area In Zibei Oilfield

Jianyucha oil-field of Chang6reservoir is located in the northern slope belt in the central,which the main reservoir of Triassic Yanchang Formation Chang6reservoir, as a typicalrepresentative of ultra low permeability sandstone reservoir, that means the reservoir physicalproperty is poor, strong heterogeneity, pore structure and complex oil-water relationship. Thereservoir pore structure different diagenesis, affected the ability to identify and evaluatereservoir using logging data seriously. In this paper, the research object of reservoir descriptionis Jianyucha area of ZiBei-oilfield Chang6formation.The reservoir evaluation includesSmall layer of division and correlation, micro structure, sedimentary microfacies, reservoircharacteristics and log interpretation models and other aspects of the comprehensiveevaluation of reservoir, the main Mainly achieved as following:(1) Jianyucha oil-field of Chang6reservoir is located in the northern slope belt in thecentral, on the whole is a gentle west dip monocline, East High and west low. Reservoir groupwas divided into Chang611,Chang612, Chang613, Chang621, Chang622, Chang63six layers.(2) The research shows on well Chang6layers of top structure is inherited, the macrostructural features are consistent. No larger structure, developed only small amplitude noseshaped uplift.(3)The types of sedimentary facies of Chang6formation is delta sedimentary,sedimentary facies is delta plain sedimentary, sedimentary microfacies are distributary channeland floodplain marsh sedimentation, sand body is delta plain distributary channel sand bodies,the distribution direction of North-east–South-west.(4) The Chang6formation sandstones are mainly feldspathic sandstone, fillings aremainly laumontite. Chang6formation reservoir average porosity is8.9%, the average rate of0.262mD. Chang6reservoir pore types are mainly dissolved pore and intergranular pore is themain pore. Chang6reservoir pore throat is small, the sorting, and the connectivity are well(5) The study based on the property relationship of Chang6reservoir, through a varietyof methods of the interpretation model of porosity and oil saturation was established, todetermine the division standard of effective thickness of the region, to lay the foundation for the Chang6reservoir of multi well evaluation and favorable area prediction.