摘要
文昌A凹陷具有很好的储盖组合、储层有利相带与圈闭空间配置较好、圈闭形成早于烃类大量形成期等优越条件。其中921井发现的天然气为凝析油伴生气,烃源岩为下第三系恩平组陆相地层。该气属生油窗内干酪根热降解的产物,油气大量形成和排烃时间为珠江组二段沉积末期(约相当于生油岩埋深2600m),自此以后至第四纪为油气聚集期。该区有良好的勘探前景。
In Wenchang A sag of Pearl River Mouth basin there are excellent assemblage of reservoirs and seals, and spatial relationship of favourable reservoir facies and traps. In addition, traps were shaped prior to significant hydrocarbon generation there. Natural gas discovered in 921 well is associated gas together with condensate and derived from the continental facies of Enping formation of Paleogene age. The gas was generated within the oil window due to thermal degradation of kerogen, while the significant hydrocarbon generation and expulsion occurred at the end of second member deposition of Zhujiang formation when the source rock was buried to depth of approximate 2600m. From then on to Quaternary hvdrocarbon had a tendency to accumulate. In a nutshell, Wenchang A sag is of good prospectivity for further exploration.
出处
《中国海上油气（地质）》
1989年第6期27-34,共8页
China Offshore Oil and Gas(Geology)
