潜山储层定量预测技术研究与应用——以珠江口盆地惠州凹陷H潜山为例

惠州凹陷古潜山埋藏深、构造复杂、储层非均质性强, “甜点”储层及潜山内幕复杂断裂体系表征难度大。从潜山储层成因机理出发, 基于潜山风化裂缝带、内幕裂缝带储层主控因素的分析, 形成了潜山储层定量预测关键技术。针对风化裂缝带, 基于Keys-Xu岩石物理模型, 构建新的弹性参数, 提高了“甜点”储层的识别能力。针对内幕裂缝带, 利用蚂蚁体技术提取优势方位断裂信息, 再将提取出的不同方位优势断裂信息进行等权融合, 实现对潜山内幕断裂的精细刻画。以上技术有效指导了惠州凹陷H潜山储层的勘探评价, 为珠江口盆地潜山勘探提供了宝贵经验。

The ancient buried hills formed by complicated tectonic movements in the Huizhou sag, the Pearl River Mouth Basin feature large buried depth and strong reservoir heterogeneity.After forty years of exploration and development, it becomes increasingly challenging to characterize sweet-spot reservoirs and complicated fractures inside buried hills.Based on the genetic mechanism of buried-hill reservoirs, we investigate major controls on reservoirs in weathered fracture zones and internal fracture zones and establish key techniques for quantitative prediction of buried-hill reservoirs.For weathered fracture zones, we derive a new elastic parameter from the Keys-Xu model to improve sweet-spot identification and use prestack elastic inversion to predict sweet-spot reservoirs.For internal fracture zones, we use ant tracking to estimate dominant azimuths of fractures and then integrate equally weighted azimuthal data for fracture prediction.These techniques have offered effective support to the exploration and evaluation of a buried hill, H, in the Huizhou sag and may be applied to buried-hill exploration in additional prospects in the Pearl River Mouth Basin.