基于地震多属性的储层预测——以珠江口盆地恩平凹陷古近系恩平组为例

RESERVOIR PREDICTION BASED ON SEISMIC MULTI-ATTRIBUTES ANALYSIS:AN EXAMPLE FROM PALEOGENE ENPING FORMATION OF ENPING SAG IN THE PEARL RIVER MOUTH BASIN

珠江口盆地恩平凹陷恩平组是重要的油气储层,但受钻井资料较少且分布不均匀的限制,应用常规手段无法进行精细的储层预测。利用地震多属性分析技术,结合测井曲线及区域地质资料,对恩平凹陷恩平组进行了精细的地震解释。根据珠江口盆地恩平凹陷高精度的三维地震和钻井等资料,将恩平组分为PSQ1、PSQ2、PSQ3 3个三级层序。基于建立的等时层序地层格架,表明恩平组发育辫状河三角洲相、扇三角洲相和滩坝相3种类型的沉积相。研究成果对恩平凹陷下步的油气勘探具有重要的指导意义。

The Paleogene Enping Formation of the Enping Sag is the most important reservoir in the Pearl River Mouth Basin. It is hard to be predicted precisely by using conventional methods due to ab- sence of corresponding data such drilling data which are usually unevenly distributed. Using the seis- mic multi-attributes analysis technique, combined with the data of well logs, core, lithology and re- gional geology, we made a fine interpretation of the lithofacies of the Enping Formation. The Enping Formation could be divided into three third-order sequences： PSQ1, PSQ2, and PSQ3. Within the i- sochronous stratigraphic framework, there are three sedimentary facies, i.e. braided river delta, fan delta and beach bar facies. The results have been tested in the hydrocarbon exploration in the Enping Sag.