为明确渤南洼陷沙四上亚段膏盐层成因，综合利用录井、分析化验等资料对膏盐层发育特征、成因类型等进行了分 析。结果表明：渤南洼陷沙四上亚段膏盐层主要以石膏质泥岩和含膏泥岩为主，其次为石膏岩和泥膏岩，石膏岩在纵向上 主要分布在2800~3600 m深度段，在横向上呈两条粗带状东西向展布；膏盐层沉积期气候湿润，水深较大，膏盐层为深水 成因，火成岩与膏盐层分布具有良好的耦合关系，推测火成岩喷发和侵入为膏盐层形成提供了来源物质。

In order to understand the genesis of gypsum zone in the upper Upper part of the fourth member of Shahejie Formation in Bonan sag, comprehensive analyses of drilling data, testing data, the developmental features, and genetic types of gypsium zone were performed. The results show that the gypsum zone is mainly composed of gypsum mudstones and gypsum rocks, and the gypsum rocks mainly occur in the depth range between 2800 m and 3600 m, and as two EW-trending wide belts. The climate was humid and lake was deep during the depositional period of gypsum zone. The distribution of igneous rocks and the gypsum zone appears to be coupled and we speculate that salts substances came from deep thermal brine. The gypsium zone belongs to the type that salt was deposited in a deep water environment. The results may help understand genesis of gypsium zones in other regions.