莱州湾凹陷垦利11区盐构造特征及成藏分析

An analysis of salt structure and accumulation in Kenli 11 district of Laizhou Bay Sag

孙和风 周心怀 彭文绪 王德英 彭刚

Sun Hefeng Zhou Xinhuai Peng Wenxu Wang Deying Peng Gang

中国石油大学资源与信息学院, 北京 102249; 中海石油(中国)有限公司天津分公司, 天津塘沽 300452

China University of Petroleum, Beijing 102249; Tianjin Branch of CNOOC Ltd., Tanggu 300452

莱州湾凹陷垦利11区首次在渤海海域揭示了盐湖沉积体系及盐相关构造。利用最新钻井资料,分析区域构造应力背景,结合地震反射特征,认为垦利11区盐构造处于盐枕发育阶段;盐层厚度北部大于南部。盐构造活动形成了垦利11区近源、短距离运移的成藏特征,围绕盐体的含盐热流体对油质的改善有重要影响。垦利11区发现的油气集中在盐上层,分析表明垦利11区盐下层有良好的生储盖组合、保存条件,是重要的目的层系。

Kenli 11 district in the Laizhou Bay first revealed salt deposition system and related structures in the Bohai Sea. Based on the latest drilling data, the regional tectonic stress analysis, and seismic reflection characteristics, the study shows that salt structures in Kenli 11 district is a salt pillow, in which the thick-ness of salt in the north part is larger than that of the south. The reservoir characteristics are nearsource and short distance migration, which related to salt tectonic activity. The salt geothermal fluid around the salt is important for improving the quality of the oil. The upper salt formation is an important target of ex-ploration.