L16油田储层宏观非均质性及对稠油热采的影响研究

Research on Macroscopic Heterogeneities and Their Effects on Thermal Recovery of Heavy Oil in L16 Oilfield

摘要: 储层宏观非均质性是影响油田剩余油赋存和开采效果的主要地质因素之一。L16油田的油气藏类型为非常规高孔高渗块状厚层底水特稠油油气藏。针对这一现象，结合该区实际地质情况，利用区内岩性、物性、电性及含油性等资料，定性评价该油田储层非均质性及其成因，并分析非均质性对稠油热采的影响。将区域宏观非均质性分为层内、层间、平面3类进行探讨。结果表明：研究区层内非均质性较强，主要受沉积构造、粒度韵律、渗透率方向性、渗透率非均质性及夹层分布等因素的控制；平面非均质性受砂体几何形态及展布影响较大；研究区只有一套油层，油层内不存在层间隔层发育，仅仅是发育层内夹层，故层间非均质性问题可以说不存在。通过对储层非均质性的研究，可以掌握研究区对稠油热采的影响因素并对后期勘探开发提供重要依据。

Abstract: Reservoir macroscopic heterogeneity is one of the main geological factors that affect remaining oil distribution and recovery effectiveness. The reservoir type of L16 oilfield is unconventional high porosity, high permeability, massive thick bottom water and extra heavy hydrocarbon reservoir. In view of this phenomenon, according to the practical geological situation, geological data of lithologies, physical properties, electric properties and oiliness were adopted to conduct qualitative evaluation of L16 reservoir heterogeneity and its cause, and to analyze the influences of het-erogeneity on thermal recovery of heavy oil of the reservoir. This paper divided macroscopic het-erogeneity into the intra-layer, inter-layer and plane heterogeneities for respective discussion. The result shows that the intra-layer heterogeneity is strong in the study area, which is mainly controlled by sedimentary structure, rhythm, permeability directivity, permeability heterogeneous and interlayers; the plane heterogeneity is mainly affected by the geometric shape and distribution of sand body; there is only one oil layer in the study area. There is not interlayer development in the oil layer, only intraformational bed in the development layer, so the problem of interlayer heterogeneity is nonexistent. The research of the reservoir heterogeneity provides important theory basis for grasping the distribution of remaining oil and later exploitation in the study area.