摘要
本文讨论了莺歌海盆地崖13—1气田一套典型三角洲相沉积体系及其地震相模式.提出该气田巨大天然气储量具多源成因和多产层的观点.同时对沉积物有机相,有机质稀化和天然气富集的规律进行探索.最后提出莺歌海成气模式的设想,并认为该盆地具有新的油气勘探前景.
The largest offshore gasfield of China is Ya 13-1 in the Yinggehai Sea. Miocene sedimerits of the gasfield hold a set of inlet deltaic sedimentary system, divided into 4 kinds of typical seismic facies models in 3 stages. The authors think that sedimentary conditions favourable for the formation of gas pools exist in the transitional area between the delta sand-prone and argillac-eous-prone facies. After discussion of organic facies, organic-matter dilution and gas accumulation regularity, the authors point out that, besides the coal measures of Eogene Yacheng Formation, another larger horizon of gas genera-tion is Neogene Huangliu-Meishan Formation (fine silty argillaceous shale), which plays an important role in gasfield formation.
This paper also points out that fast accumulation of delta sediments, huge buried thickness and high pressure anomaly lead to form hydrocarbons, which are migrating laterally and accumulated in an 'upper water and lower gas' way. And it also submits the hypothesis of 'gas-generation model in the Yinggehai Sea basin'.
We are sure that there is a new prospect of oil-gas explorations in the Yinggehai Sea basin.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1989年第4期59-67,共9页
Marine Geology & Quaternary Geology
