演武油田S1区延8油藏主控因素分析

Analysis of Control Factors of Yan 8 Reservoir in S1 Area of Yanwu Oilfield

以鄂尔多斯盆地演武油田S1区为例,在对油藏静态地质特征分析的基础上,结合生产动态资料,并以实验数据为支撑,按照点—线—面的研究方法,全面系统的总结了侏罗系延8油藏主控因素。重点分析古地貌、构造特征、沉积微相及砂厚、储层微观特征、储层物性等与油层分布以及产能的关系,为同类油藏开展主控因素分析提供可借鉴的技术方法。前侏罗系古地貌是控制侏罗系油藏最重要的因素,直接决定了油藏的分布位置及规模大小。河道沉积的厚层复合砂体以及良好的储层物性是形成规模油藏的基础。分析表明,油藏构造特征对研究区延8储层含油性控制作用明显,局部成岩作用较强导致储层孔喉变小,含油性变差,进而加剧了油藏的非均质性。本次研究可为后期滚动扩边、增储增产以及调整开发方案提供指导意见。

Taking S1 area of Yanwu oilfield in Ordos Basin as an example, based on the analysis of static geological characteristics of the reservoir, combined with production dynamic data and supported by experimental data, the main controlling factors of Yan 8 reservoir in Jurassic are comprehensively and systematically summarized according to the point-line-plane research method. The relationship between palaeogeomorphology, structural characteristics, sedimentary microfacies and sand thickness, reservoir micro-characteristics, reservoir physical properties and reservoir distribution as well as productivity is emphatically analyzed, which provides a reference technology for analysing the controlling factors of similar reservoirs. Pre-Jurassic palaeogeomorphology is the most important factor to control Jurassic reservoirs, which directly determines the location and size of reservoirs. Thick composite sand bodies in distributary channels and good reservoir physical properties are the basis of forming largescale reservoirs. The analysis shows that the structural characteristics of the reservoir have obvious controlling effect on the oil-bearing property of Yan 8 reservoir in the study area. Strong local diagenesis results in smaller pore throat and worse oil-bearing property of the reservoir, which further aggravates the heterogeneity of the reservoir. This study can provide guidance for rolling edge enlargement, increasing reserves and production, and adjusting development plans.