利用动态测试资料研究砂砾岩油层物性变化特征

目前中国东部许多砂砾岩油田相继进入高含水开采后期，由于水驱推进不均匀，矿物和胶结物组分的差异以及地下流体性质的不断变化，造成储集层物性变化复杂，纵、横向上非均质性更为严重，变化机理解释及其它相关研究难度加大。在对泌阳凹陷双河油田和下二门油田注水开发后期砂砾岩储集层物性特征的研究中，根据精选出来的连续测试多年（至少５ａ以上）的油层吸水及产液剖面，利用测井资料进行物性、岩性和相带解释，依据吸水及产液强度对油层物性变化趋势进行分类，并直接与孔隙结构研究技术相结合。该方法可在中国东部砂砾岩及其它油藏储集层评价中推广使用。照片２图１表４（郭海莉摘）

Studying petrophysical property variation of sandgravel mixed reservoir using dynamic test data.

Many oilfields in East China, like Shuanghe and Xiaermen, have entered into the development stage with high watercut in succession. At this stage, waterdrive process is uneven and minerals, cement materials as well as fluid properties in the formation vary frequently. These could result in unpredictable variations in petrophysical properties and make formation heterogeneity more serious both vertically and horizontally. Mechanism interpretation thus becomes more difficult. Dynamic test analysis is a method which can be used specifically to study variation characteristics of reservoir at the later stage of development. Based on the continuous measurement of imbibition (production) profiles and lithologic, facies and petrophysical parameters derived from log interpretation, the relationship between imbibition (production) strength and petrophysical variation trend can be classified and directly related to the techniques used in porestructure study. By integrating dynamic and static test, macroscopic and microscopic reservoir evaluations as well as mechanism study, a new method which is suitable for evaluating sandgravel mixed reservoirs has been established and it could be widely applied to many oilfields in East China.