复杂岩性储层核磁共振测井岩心分析

NMR Core Analysis in Complex Lithologic Reservoirs

复杂岩性油气藏其岩石矿物组分往往复杂多变,导致非均质性严重,储集空间类型多样,常规测井难以获得储层关键参数。核磁共振测井能提供不受岩性影响的孔隙度等参数,在复杂岩性储层评价中具有广泛应用前景。为了提高核磁共振测井的应用效果,需要对岩心样品进行核磁共振岩心分析,通过孔隙度、束缚水饱和度和孔隙度、横向弛豫时间截止值(τ2cutoff)、渗透率等测试分析,建立了研究区的核磁共振测井解释模型,指导了研究区的储层评价,提高了储层参数计算精度。

In a complex lithologic reservoir,its rock mineral composition was complex and changeable,thus its heterogeneity was serious,reservoir space types were of great varieties,critical parameters were difficult to be obtained.composed of several types of mineral components,leading to severe reservoir heterogeneity and various types of pore space.It is difficult to obtain key reservoir parameters using conventional logging.Porosity parameters without influence of lithology could be provided by NMR logging,therefore it had a wide prospection for complex reservoir evaluation.To improve the application effect of NMR logging,it is necessary to carry out NMR analysis on rock cores,through the analyses of porosity,irreducible water,transverse relaxation time(τ2),τ2cutoffand permeability,a NMR logging interpreting model was established in the studied area,it is used to guide the reservoir evaluation improve the calculation accuracy of calculation in the studied area.