混沌属性预测泌阳凹陷陡坡带小型砂砾岩体

Application of Chaos Attributes to Predict the Small-Scale Glutenite Bodies in the Steep-Slope Zone of Biyang Depression

泌阳凹陷南部陡坡带小型砂砾岩体储层非均质性强、横向相变快,传统的地震属性描述技术不能有效刻画小型砂砾岩体的空间形态。混沌属性是基于局部构造张量特征值相对大小、不同特征值组合运算得到的属性,该属性体可有效突出特殊地质体的边界,可以较好地刻画小型砂砾岩体储层的空间展布。通过对混沌属性原理的论述,提出了利用混沌属性预测小型砂砾岩体的思路及方法。在对已钻井钻遇的砂砾岩体储层地球物理响应特征研究基础上,分析砂砾岩体储层属性敏感性,优选混沌属性。以特殊处理得到的混沌属性为基础,利用精细解释及地层切片技术对小型砂砾岩体进行描述,准确地预测了泌阳凹陷陡坡带小型砂砾岩体的空间分布。预测结果与实钻井吻合,部署的井位均钻遇油层。

The small-scale glutenite bodies in the steep-slope zone of southern Biyang Depression are featured by strong reservoir heterogeneity and great lateral variation,and the spatial distribution of small-scale glutenite bodies cannot be effectively characterized by conventional seismic interpretation. Chaos attribute is gained from the combination operation of local different structure-tensor characteristic values,which can specifically characterize the boundary of special geobody and effectively characterize the spatial distribution of small-scale glutenite reservoir. The idea and method of using chaos attribute to predict small-scale glutenite body is proposed by providing the chaos attribute principles in detail. The sensitivity of small-scale glutenite reservoir properties is analyzed and chaosphere attributes are optimized based on the geophysical responses of the drilled small-scale glutenite reservoirs in the available wells. Based on the chaosphere with special treatment,fine interpretation and strata slicing are used to characterize the small-scale glutenite bodies and accurately predict the spatial distribution of small-scale glutenite bodies in the steep-slope zone of Biyang Depression. The prediction agrees with that of practical drilling and all the deployed wells have drilled across oil reservoir.