Research On Fine Reservoir Description Of Yan5 Reservoir In Block Huang159 Of Jiyuan Oilfield

Yan5 reservoir in block Huang159 of Jiyuan oilfield is located in oil and gas exploration area,which crosses two countries,Shaanxi Dingbian and Ningxia Yanchi.Its destination layer is in the 5th member of the Yanan formation,which attributes to the medium porosity and low permeability lithologic structural reservoir.On the one hand,its active edge and bottom water results the fast water cut rising and the large energy losing of the side wells.On the other hand,it has been developed by natural energy since put into production.Most of the side wells had been water-flooded.Enhancing water injection,converting oil wells to water injection wells or ignoring it,there is no conclusion yet.Faced with above problems,this paper takes the Yan5 reservoir of block Huang159 as an example.First of all,it studyed on the comprehensive geological characteristics and reservoir characteristics of block Huang159 and then established the 3D geological models of it.In addition,analysing its reservoir production status and development characteristics,found out the reasons for the high water cut.Finally,adjusting the reservior development schemes through reservior numerical simulation technology,presented the reasonable and stable technical contermeasures which lead to a high production.Studies shown that the Yan5 reservoir of block Huang159 mainly includes the delta deposition.The Sedimentary microfacies are distributary channel and distributary bay.The reservoir sand body distributes from northwest to southeast.We analysed the scale of water and the distribution of residual oil by establishing the 3D geological modes of micro structure,lithofacies,porosity and permeability.The simulation model has been predicted and optimized through the establishment of numerical simulation that has a best history matching with the single well fitting rate over 85%.After that,8 production schemes were proposed.The research refferred in this paper not only has a practical guiding significance to the high oil production of block Huang159 and makes its development benefits maximization but also has a certain significance to the development of edge and bottom water reservoir in Jiyuan oilfield.