柴达木盆地涩北二号生物气田砂体产能分类评价

发布时间：2019-05-14 03:01

【摘要】：从柴达木盆地涩北二号气田砂泥薄互层滩坝相高孔-中低渗细粒储层特征出发,以气层产能为评价目标,在分析其内涵的基础上,选取孔隙度、渗透率、含气饱和度、有效厚度和泥质体积分数5个地质参数,厘清各参数的影响方式,并建立层次结构模型;以单砂体为基本单元,将消除生产压差影响的"视无阻流量"作为比较参数,采用相关分析结合层次分析法确定参数权重;结合现场生产实际从产能角度将气层分为3类。结果表明:气层分布特征与实际气井产能趋势吻合较好,气层产能分布不但受控于含气丰度、储层条件及原始地层压力,同时也受隔层质量及构造位置的影响。纵向上,由深至浅各气层组的气层数量逐渐增多,但高产能级别气层比例逐渐降低;气层组内部普遍具有气层下少上多,气层产能级别下高上低的特征。平面上,高产能级别气层较多分布在构造高部位即含气面中央部位,向构造边部逐渐过渡为低产能级别气层。通过评价气层产能潜力,可全面了解气层产能分布状况,便于优化调整部署方案。
[Abstract]:Based on the characteristics of sand mud thin interbedded beach phase high porosity and low permeability fine grain reservoir in Shibei No. 2 gas field in Chaidamu Basin, taking gas reservoir productivity as the evaluation goal, and on the basis of analyzing its connotation, porosity, permeability and gas saturation are selected. The effective thickness and mud volume fraction are five geological parameters, the influence mode of each parameter is clarified, and the hierarchical structure model is established. Taking the single sand body as the basic unit, the "apparent unobstructed flow", which eliminates the influence of production pressure difference, is taken as the comparative parameter, and the parameter weight is determined by correlation analysis combined with analytic hierarchy process (AHP). Combined with the field production practice, the gas reservoirs are divided into three categories from the point of view of productivity. The results show that the gas reservoir distribution characteristics are in good agreement with the actual gas well productivity trend, and the gas reservoir productivity distribution is not only controlled by gas abundance, reservoir conditions and original formation pressure, but also affected by the quality of interlayer and structural location. Vertically, the number of gas reservoirs in each gas reservoir group from deep to shallow increases gradually, but the proportion of high energy grade gas reservoirs decreases gradually. On the plane, the high energy grade gas reservoirs are mostly distributed in the high part of the structure, that is, the central part of the gas bearing surface, and gradually transition to the structural edge to the low productivity grade gas reservoirs. By evaluating the potential of gas reservoir productivity, the distribution of gas reservoir productivity can be fully understood, and it is convenient to optimize and adjust the deployment scheme.
【作者单位】：中国石油大学地球科学与技术学院;中国石油青海油田勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05009-003)~~
【分类号】：TE328

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