渤海湾盆地黄河口凹陷明化镇组下段物源分析

Provenance Analysis of the Lower Member of Minghuazhen Formation in Huanghekou Sag of Bohaiwang Basin

针对目前黄河口凹陷物源体系发育特征不明确的问题,研究着重从构造背景分析与古水系特征、重矿物组合与ZTR参数变化规律、砂岩分异特征及泥岩颜色等4个方面入手,深入分析了黄河口凹陷明化镇组地层沉积期物源供给特征。结果表明:黄河口凹陷明化镇组沉积期受4个方向物源影响,分别来自于西北部的沙垒田凸起,东北部的渤南凸起,东南部的鲁西隆起,南部的垦东-莱北低凸起。深化物源供给体系认识对明确黄河口凹陷新近系主力层段明化镇组下段后期勘探开发具有重要意义。

For determining the ambiguous problems of the provenance system of Huanghekou Sag,the characteristics of provenances of the lower member of Minghuazhen Formation in Huanghekou were analyzed by emphatically studying the geotectonic background,the ancient drainage systems,heavy mineral combination,ZTR parameter variation rules,differential of sandstone and mudstone colors.The results show that the depositional period of Minghuazhen Formation is influenced by provenances from four different directions,they come from Saleitian bugle in northwest,Bonan bugle in the southeast and Luxi bugle in the northwest and the Kendong-Laibei low bugle in the south.It is of great significance of deeply understanding the Neogene provenances system in the lower member of Minghuazhen Formation in Huanghekou Basin for oil exploration and development.