Study On The Remaining Oil Distribution In The Gongdatan Area Of Ganguyi Oilfield

By the affect of depositional environment, diagenesis,structure and other fators,targetlayers chang6in the Gongdatan area of Ganguyi oilfield have characteristics like lowprosity,low permeability,low pressure and strong heterogeneity.By means of stratigraphicclassification,structural character and sedimentary microfacies study, it determined that chang6is river lake delta sedimentary system, the chang61is delta plain subfacies, from chang62to chang64are the delta front subfacies. The main subaqueous distributary channel,distributary channel, river mouth bar, front sheet sand and interdistributary bay microfaciesconstructed the sedimentary facies belt basic pattern. For each layer in this area,calculated theoil geological reserves, the results showed that from chang611to64, the oil geologicalreserves is106.743*104t and technical recoverable reserves is18.97*104t. Especially,for allthe layers of each single well,calculated the crude oil reserves and analysis the potential ofremaining oil distribution, drawing all the layers of single well production status and theremaining recoverable reserves distribution and enrichment chart. Elaborated the maximum ofresidual oil distribution are chang611and chang613, the relatively large are chang622,chang632and chang64, the small residual oil layer are chang621and chang631. Used each layer ofsingle well that controled the remaining recoverable reserves of tapping the potential ofremaining oil wells and accumulation, elaborated the main direction of oilfield efficientdevelopment and development potential.