南黄海西部地区浅层气的浅部埋藏地质背景

Shallow geological background of shallow gas in the western South Yellow Sea

根据南黄海西部地区6 000 km多的浅地层剖面解释成果,对浅层气埋藏的载气地质体和地层时代两方面进行了分析。结果表明,南黄海西部地区浅层气主要存在于埋藏三角洲相、古湖泊相、古河道相、古潮沟相地质体中,在中更新世晚期以来的两期海相地层(全新世和晚更新世)和两期陆相地层(玉木冰期、里斯冰期)中都存在浅层气的地震反射。

Based on the interpretation of about 6 000 km＇s shallow seismic profile in the western South Yellow Sea, the gas-containing geological bodies and their stratigraphie chronology are analysed in this paper, and the following conclusions are obtained： 1. the shallow gas in the western South Yellow Sea is mostly distributed in the buried delta facies, paleo lacustrine facies, paleo-fluvial facies, and paleo-tidal channel facies; 2. the shallow gas as indicated by seismic reflections is buried in the two stages of marine sediments deposited in Holoeene and Late Pleistocene and in the two stages of terrestrial sediments deposited during Wurm and Riss glaciations.