川西坳陷蓬莱镇组河道砂体识别技术

THE TECHNOLOGY FOR IDENTIFYING THE RIVER SAND BODY IN PENGLAIZHEN FORMATION OF WESTERN SICHUAN DEPRESSION

河道砂体是川西蓬莱镇组主要储集体,如何准确、快速的识别河道砂体是提高钻探成功率、降低生产部门投资风险的关键。河道砂体以单层厚度小、单砂体体积小、横向变化快为特点,利用常规的方法难于识别。对此,通过分析该类储集体的沉积特征,建立相应的地球物理响应模式,利用先进的三维可视化技术快速地识别出河道砂体,为生产部门部署钻井提供精确的模型。经实际应用表明该方法具有良好的应用效果,并在中国广泛分布的陆相地层中具有较高的推广价值。

The braided sand body is the main reservoir in Penglaizhen Formation of Western Sichuan depression. The accurate and rapid identification of river sand is the key to raise the percentage of drill success and reduce the investment risk. Nevertheless, as a single sand unit is small in thickness and volume and the lateral variation is fast, it is difficult to identify this sand body with the traditional method. In view of this situation, this paper has analyzed the sedimentary features, set up a geophysical response model, and used the advanced 3D visualization method to identify the river sand body. Practice shows that this method is fairly effective and deserves wide popularization in vast continental strata areas of China.