渤海海域盆内低凸起周边近源砂体形成条件及预测方法——以辽东湾JZ-A构造区沙一、二段为例

The formation conditions and prediction methods of near-source sand body adjacent to low salient in Bohai Bay Basin——taking Es1 and Es2 formation in the JZ-A structure, Liaodong Bay as an example

刘志刚 宋章强 郭涛 张中巧

Liu Zhigang Song Zhangqiang Guo Tao Zhang Zhongqiao

中海石油(中国)有限公司天津分公司, 天津塘沽 300452

Tianjin Branch of CNOOC Ltd., Tanggu Tianjin 300452

传统认为渤海海域辽东湾地区的盆地低凸起由于面积小,不能作为有效物源,周边碎屑储层不发育。通过仔细分析JZ-A构造相邻凸起区的钻井、地震等资料,分析认为该低凸起区沙二早期辫状沟道发育,可以作为有效物源区,沙二晚期发育湖相碳酸盐岩沉积。在动态物源理论指导下,在精细的古地貌及古沟谷分析基础上,应用宏观地震相分析技术、地震属性分析技术、多属性聚类分析技术预测了沙二早期辫状河三角洲展布范围。后来的勘探实践与预测结果完全吻合,并发现了中型油气田。该地区沉积储层的成功预测,在类似构造区块有一定借鉴意义。

For a long time, because the area of low salient in Liaodong bay area in Bohai Sea was small, it wasn't considered as an effective source and the clastic reservoirs wasn't developed.By analyzing drilling and seismic data in JZ-A structure, braided valleys are developed in this low salient during sedimentation early stage of Es2 and they can be treated as the effective source.During late stage of Es2, the carbonate sediments were developed.Under the direction of dynamic source theory and based on the subtle analysis of palaeogeomorphology and paleovalley, braided-river delta distribution during early stage of Es2 was predicted by using seismic facies analysis techniques, seismic attribute analysis techniques and multi-attribute combination of cluster analysis techniques.Finally, a middle scale oilfield was found which provided reference for future petroleum geological exploration in other similar structures.

中海石油(中国)有限公司"十一五"重大基础研究项目"渤海湾地区油气形成富集与分布预测"(编号:SC06TJ-TQL-004-BH02)资助。

https://doi.org/10.3969/j.issn.1008-2336.2011.01.022