塔木察格盆地复杂岩性储层流体识别

IDENTIFYING METHOD OF THE FLUIDS IN THE COMPLEXLITHOLOGY RESERVOIRS OF TAMUTSAG BASIN

塔木察格盆地中部断陷带塔南、南贝尔油田目的层岩性以火山碎屑沉积岩类为主。由于含凝灰质岩性的孔隙以中、小孔为主，油藏类型多样，饱和度主控因素复杂，在油、水过渡带或成藏充注程度不高的情况下油、水层测井响应对比度低，给测井解释带来很大困难。因此，应用岩石物理实验结果分析了火山碎屑对储层测井响应特征及孔隙结构的影响，明确了构造油藏、岩性油藏含油饱和度控制因素和分布规律。在此基础上，建立了基于“四分”储层并考虑油藏类型、模式的流体识别方法，提高了复杂岩性储层流体识别精度。

The lithology of the target layer of Tanan and South Ber＇er Oilfields in the central faulted belt of Tamutsag Basin is mainly pyroclastic sedimentary rocks. Because the tuffaceous pores are generally characterized by medium and small pores ; the oil reservoir types are various ; the main controlling factors of the saturation are complicated ; under the conditions of oil and water transitional belt or not high reservoir-infilled degree, the response of the well logging in aqueous layer is rather lower, so it is rather difficult to interpret the well logs. Therefore applying the results of the petrophysical experiments, the influences of the pyroclast on both the characteristics of the well logging response and the pore structure of the reservoirs are analyzed, so the controlling factors and distribution laws of the oil saturations of structural and lithological reservoirs are made clear. On the basis of the above, the identifying methods for the fluids are established on the bases of ＂Four classifications＂ reservoirs and the consideration of oil reservoir type and model, so the identification precision for the complex-lithology reservoirs are enhanced in the end.