川东北地区膏盐岩影响下的储层成像技术与效果分析

The imaging techniques of reservoirs influenced by saline deposit in the Northeastern Sichuan Basin

(1.中国石油化工股份有限公司勘探南方分公司,四川成都610041;2.中国石油化工股份有限公司石油物探技术研究院,江苏南京210014)

Qi Zhongshan,Exploration South Branch Company,SINOPEC,Chengdu 610041,China

川东北地区海相储层成像不仅受复杂表层地震地质条件的影响,而且还受嘉陵江组膏盐岩的影响,长兴组—飞仙关组海相储层成像困难。从优化成像基础数据、叠加成像、叠后及叠前偏移成像等方面论述了在膏盐岩影响下进行储层成像的技术方法,分析了叠后偏移和叠前时间偏移处理存在的不足,认为叠前深度偏移处理是消除膏盐岩影响、确保储层精确成像最有效的方法。实际资料处理结果反映的储层地质信息丰富、可靠,为岩性识别与储层预测提供了高质量资料。

The imaging of marine reservoir at Changxing-Feixianguan Formation in the Northeastern Sichuan basin is difficult,which is not only impacted by the complex surface seismic-geologic conditions,but also influenced by saline deposit of Jialinjiang Formation.The techniques was discussed on how to perform reservoirs imaging influenced by saline deposits from the aspects of optimization of basic data,stack imaging,poststack migration and prestack migration.Meanwhile,the disadvantages of prestack time migration and poststack migration processing were analyzed.The result indicates that prestack depth migration is the most effective method for accurate reservoir imaging while removing the impact of saline deposit.Actual application reflects abundant and reliable geologic information of the reservoirs,which provides high-quality data for lithology identification and reservoir prediction.

10.3969/j.issn.1000-1441.2011.06.011