Fine Reservoir Description Study On Cretaceous Jiufotang Formation Of The Block Bao1 In The Kerqin Oilfield

Block bao1 of Kerqin oilfield locate at middle part of Baoriwendi fault of the Kailu Basin. At present four sets of oil reservoir has been found at upper part of Cretaceous Jiufotang formation. The lower two sets of which are the main layers of purpose for the development. Bao1 block which was developed in 1993 has exposed a clear illegibility of partial structures, imperfect injection-production well network and issues such as high integrated containing water which leaded to less desirable effect of the block in the process of developing. It is very urgent need for fine reservoir description study to further the next step.The study involved the use of multi-disciplinary co-synthesis research methodology. A lot of work was done which included structural analysis, sedimentary facies study, reservoir characteristics and the studies of heterogeneity, three-dimensional geologic model and numerical model of development study. Main achievement includes. (1) The fan subfacies and the next sub-phase fan of nearshore subaqueous fan deposition are identified through the sedimentary facies studies . It's microfacce include braided channel, channel side edge and inter Channel, and braided channel is main in the three microfacces. Its sand body was formed by multi-stream and multi-fan spread nearly east-west. (2) Through reservoir characterization, reservoir is the rapid accumulation of recent provenance of underwater. Rock maturity is low. Rock phase is numerous and miscellaneous. Micro-pore structure has poor conditions and mainly low permeability. Reservoir comprehensive evaluation result is that theâ…¢andâ…£reservoir group is relatively better than theâ… andâ…¡. The main advantage is that oil-bearing area, the effective thickness is large. (3) Three-dimensional structure model of the block bao1, well model, reservoir model, attribute model through the geological modeling are identified and reservoir distribution and reservoir characteristics of reservoir are quantitatively descripted through Geological modeling. Throuth numerical simulation study, further learned the dynamics situation of the block. And reproduce the history of the development of the reservoir throuth detailed study of history matching in high degree. (4) Throuth research for esidual oil distribution, recognize that distribution of residual oil in the reservoir is in a wide range, the average residual oil saturation is 0.60, the remaining oily layer thickness is great and potential, and has great potential in the potential adjustment. Through this research, a favorable direction of the potential is specified for further development work.