Reservoir Evaluation Of Zhaozhou Oilfield Fuyu Reservoir And The Research Of Development Characteristics

Fuyu reservoir of Zhaozhou oilfield in Sanzhao depression located on the convergence of the southwest and north provenance.From the proved reserves distribution situation of view,the Shengping,Xujiaweizi oilfields are mainly affected by north sedimentary system and the Songfangtun,Zhaozhou oilfields are mainly affected by southwest sedimentary system.Intersection of various depositional system lead to differences of Fuyu reservoir in the conditions of large.Form the several developed tests of view,the condition of development effect are different at the same technology policy.Therefore,this thesis studies on microscopic characteristics of Fuyu reservoir and analyses the difference between different blocks of storage reservoir microscopic characteristics.Based on this evidence it will research on the development of technology policy and adjust the direction of different blocks.Through the analysis of core data,laboratory experiments and other methods to carry out the micro characteristics of the reservoir and the reservoir classification and evaluation,this article determines the mineral composition,cementation types,reservoir characteristicsand diagenesis types of Fuyu reservoir.Also,this article analyses development characteristics to provide guidance for the future development of the region.Through the analysis of core data in Fuyu reservoir area,the reservoirs have high debris content,base on the muddy cementation,affected by the compaction later,focus on primary intergranular pore,performance for low porosity,low throat and typical low permeability.According to cast thin section observation,physical and mercury penetration analysis,it finds that the reservoirs have fine clastic particles,high debris content,low efficiency of mercury injection and ejection,overall poor.Fuyu reservoir enrichment zones are scattered,mainly controlled by fault.It only can select the thickest reservoirs near the oil sources and fault to arrange wells.Because of low permeability and non-Darcy percolation characteristics,it needs to take large-scale fracturing in finding out the local stress distribution of the reservoirs.In addition,reservoirs have medium to strong water-sensitive and pressure-sensitive,need to take corresponding water treatment technology or advanced gas injection to get energy.