扇三角洲地震识别及有利储层区预测——以哈萨克斯坦鲍金根地堑扇三角洲为例

Identification of Fan Delta and Prediction of Favorable Reservoir Area from Seismic Data--An Example from Fan Delta in Baojingen Graben, Kazakhstan

于浩业 袁霁 赵卫军 欧亚平 郭勇

YU Haoye YUAN Ji ZHAO Weijun OU Yaping GUO Yong

中国石油新疆油田分公司勘探开发研究院, 乌鲁木齐 830011; 中国石油新疆油田分公司准东采油厂, 阜康 831511; 国投重庆页岩气开发利用有限公司, 重庆 400043

China Petroleum Exploration and Development Research Institute of Xinjiang Oilfield, Urumqi Xinjiang 830011, China; China PetroChina Xinjiang Oilfield Company Zhundong Oil Production Plant, Fukang Xinjiang 831511, China; The Investment Shale Gas Development and Utilization of Chongqing Co. Ltd., Chongqing 400043, China

为了总结鲍金根地堑东斜坡"陡坡扇"在单井(剖面)和地震属性(平面)上的特征,综合利用测井数据分析、正演及地震属性优选技术,取得一些认识:测井曲线整体表现为下细上粗反旋回特征;正演模型表明(顺物源方向)近断裂反射能量强,向凹陷方向能量弱的内部反射不连续的楔形特征;(垂直物源方向)沿陡坡一侧,"底平顶凸"丘状反射体相连或叠置,具有"小而多"的特点。基于以上认识,解释出扇三角洲的顶底,优选累计反射能量属性,确定了扇三角洲平面展布,预测了储层有利区,与后期钻探吻合,效果良好。此方法具有一定的推广性。

In order to summarize the characteristics of fan delta at steep slope in single well (profile) and seismic attribute (plane) in eastern slope of Baojingen Graben, comprehensive study has been conducted through logging data analysis, forward modeling and seismic attribute optimization technology, and some understanding has been made. The logging curves are characterized by inverse cycle, fine in the lower and coarse in the upper. The result of forward modeling indicated that parallel to the direction of provenance, the reflection is characterized by strong amplitude near fault, and weak energy within the sag, with wedge shape at external, and discontinuity at internal. Perpendicular to the direction of provenance, along one side of steep slope, the reflection is characterized by dome shape, which are "bottom flat and top convex" connect or overlap, with characteristics of "small size but large number ". Based on the above analysis, the top and bottom of the fan delta have been identified, and the accumulative reflected energy attributes have been optimized, the planar distribution of the fan delta has been determinated, and the favorable areas of the reservoirs have been predicated. The forecast results are coincided with late drilling results, indicating that this method could be applied to other area.

https://doi.org/10.3969/j.issn.1008-2336.2015.04.020