Remaining Oil Distribution And Development Optimization Research Of Gao 30 And Gao 14 Fault Block Reservoirs

Gao 30 fault block is the structural lithologic reservoir,the oil-bearing area of which is 3.84km2.The geological reserve is 374.92×104t and the recoverable reserve is 89.6×104t.The Sha 2 formation is the main productive region,and the characteristic of the reservoir is considered as “three-high,one small and three severe”,that is high temperature(113.8?),high oil and water viscosity ratio(94.7%),high proportion of resin and asphaltene content(50.72%),small interlayer(less than 3m generally),areal,inter-layer and inner-layer heterogeneity is severe.The development performances are: short stable period,well water cut rising fast,low water flooding efficiency.To avoid thi s challenge,we have implemented many measures(separate injection,water blocking,flooding control)since 1997,but these measures have poor adaptability,and the natural declining rate is high.Gao 14 Block,the geological reserve of which is 149.85×104t,is developed later than Gao 30 block.Since there are no injection wells currently,the development mainly rely on edge and bottom water energy.Injection-production pattern is imperfect.In this paper,facing the challenges of this reservoir,the reservoir geological reserves and research on the residual oil distribution are calculated based on the reservoir description results.At the same time,the remaining oil site is pointed out and the development potential is caluated.We also study on the development strategies about the multilayered system,well pattern,injection and production adjustment.In addition,we write the scheme of reservoir development adjustment plan to improve the development efficiency of the whole oilfield and to provide technical guarantee for the stable production of this reservoir.