摘要： 东濮凹陷是渤海湾裂谷盆地西南缘临清坳陷的一部分，和其他凹陷相比有一个显著的特征就是盐岩十分发育。东濮凹陷北部中央隆起带及周边沙三段自下而上发育了3套大的盐韵律，每套盐韵律又由若干个小盐韵律组成。在岩盐富集的地区是油田的主力产油区，油气富集与岩盐有着密切关系。通过对岩盐层岩心、测井及地震资料进行分析，总结出了盐岩的岩性、电性及地震响应特征；岩性变化为砂泥岩→含膏泥岩→膏盐→盐岩→膏盐→含膏泥岩→砂泥岩演化规律；电性主要表现为极低密度、极低自然伽马、很高电阻率及淡水钻井液扩井径等特殊电性特征；在地震剖面上常表现为强振幅、低频率的响应特征。在分析研究盐岩发育特征的基础上，总结出了盐岩的时空展布规律，同时对盐岩与烃源岩、储集层及盖层的关系进行了探讨，根据实际生产和盐岩的沉积规律对生储盖组合进行了分级。得出生、盖为同一层及生、储、盖在不同的空间与盐岩层有关的生储盖组合关系模式，在此基础上总结了东濮凹陷含盐地层油气成藏模式，明确了盐岩的石油地质学意义，对老油田的滚动勘探具有指导作用。

关键词: 东濮凹陷, 沙河街组, 盐岩, 分布规律, 生储盖组合, 成藏模式

Abstract: Dongpu Sag is located in the southwestern Bohai Bay rift basin. It is a part of the Linqing Depression. In contrast with other sags in the Bohai Bay rift basin，the Dongpu Sag has a remarkable feature that the sag is a prolific salty sag. There are three sets of salt beds in the Member 3 of Shahejie Formation of Paleogene in the central uplift and its vicinity in northern Dongpu Sag. Each set of salt beds consists of numerous salt cyclothems that are composed of salt rock and mudstone. The concentrated salt area is the main productive fairway in the Dongpu Sag. There is an intimate relationship between salt beds and oil gas enrichment. By analyzing the cores，logs，and seismic data，the authors sum up the lithologic，electric and seismic characteristics of the saltrocks. The evolutionary regular pattern of saltrock lithology is from sandstone and mudstone through gypseous mudstone，gypsum halite，halite，gypsum mudstone，to sandstone and mudstones. Electric characteristics are represented by very low density，very low natural gamma，very high electric resistivity，and expanded hole diameter in fresh water drilling mud. Seismic response are characterized by high amplitude and low frequency. Based on studies of development characteristics of the saltrocks，saltrock distribution pattern is known. At the same time the authors study the relationship between saltrocks and source rock，reservoir and cap rock，and rank the source-reservoir-seal assemblages. Ten types of the assemblages are identified. Based on this，the authors sum up the hydrocarbon accumulation. The study results define the significance of the saltrocks for petroleum geology. It is important for rolling exploration for mature oilfields.

Key words: Dongpu Sag, Shahejie Formation, saltrock, distribution pattern, source-reservoir-seal assemblage, accumulation model

中图分类号: 

• P588.24+6