Reserve Calculation And Development Program Research Of D Buried Hill In Liaohe Oil Field

With the development of the old oilfield,which is mainly produced by the sedimentary rock,the production of the old oilfield in Liaohe depression has declined sharply,the problem of the serious shortage of reserves has become more and more serious.Therefore,Fracture-porosity type buried hill reservoir in Liaohe oilfield as an important direction for the expansion of the old oil-gas region.CoMPared with the sandstone reservoir,Buried hill reservoir space is more complex,usually composed of cracks,pores and dissolution pores,each other is connected or not,the reservoir heterogeneity is very strong,How to improve the calculation accuracy of geological reserves and the development of buried hill reservoir is a difficult problem faced by oilfield workers.In this study,the volumetric method is used to calculate the proved geological reserves,but relative to the sandstone reservoir,the volumetric method of calculating buried hill reservoir has been carried out in the process of technical Innovation.Based on the multidisciplinary metamorphic rock buried hill reservoir description,new technologies of well logging evaluation,high-precision seismic reservoir prediction and other technical means to achieve technological innovation of obtaining the key parameters of reserves.Research shows that Damintun Sag D buried hill is mainly composed of metamorphic rocks,accoMPanied by the late intrusive mafic intrusive rocks,the reservoir rock is mainly composed of migmatitic granite,leucoleptite,migmatitic gneiss,gneiss.reservoir rock proportion reached more than 90%.Reservoir space is divided into two major categories of pore type and fracture type,has the characteristics of dual media,and the reservoir space is mainly composed of structural fractures,crushing intergranular pore,dissolution causes holes and seams,etc.Comprehensive analysis of drilling,logging,well test,producing test and drill core data,through the calibration of logging,establish effective thickness identification chart,determine reservoir quantitative division standard:?t?55?s/ft,30?·m?Rlld?2000?·m.On the basis of taking all calculation parameters of reserves,by using the volumetric method,the oil-bearing area of D buried hill is 21.17km~2,and the proved reserves is 4482.41×10~4t.According to the strong heterogeneity and poor physical property characteristics of buried hill reservoir,based on the combination of straight well and multi branch complex structure well,a new design method is developed.On the one hand,the deployment of multi branch complex structure wells,which can effectively enhance the rate of encountering fractures,increase the drainage area,increase the single well productivity and achieve effective employment and building rapid production of reserves;on the other hand,take the way of separate layer water injection by straight wells and extract oil by complex-structure wells,which can improve reservoir producing ratio for waterflooding and the water injection development effect.The results show that the redevelopment of D buried hill is a good oil field development project,which has good economic value.