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琼东南盆地深水区发育一条规模巨大横贯东西的下切水道,总长约500km,最大宽度约13km。通过对地震、钻井和油气成藏条件的分析发现深水区下切水道具有良好的储、盖、圈闭、保存和油气运移条件,同时其成藏的主控因素在不同位置各不相同,水道西段油气成藏的主控因素是圈闭的发育程度及其闭合高度;水道中段油气成藏的主控因素是沟通水道砂岩与下部烃源岩的断裂体系;而在水道东段烃源岩的发育情况则是控制油气成藏的主要因素。整个下切水道呈现西高东低的构造格局,油气从东向西聚集,因此下切水道中、西段是有利的勘探地区。
In the deep-water area of Qiongdongnan Basin, an undercut waterway with a large scale transiting east and west is developed with a total length of about 500km and a maximum width of about 13km. Through the analysis of the conditions of the earthquakes, drilling wells and hydrocarbon accumulation, it is found that the sub-cutters in the deepwater area have good conditions of reservoir, cap, trapping, preservation and hydrocarbon migration. At the same time, the main controlling factors of their accumulation are different at different positions. The main controlling factor of hydrocarbon accumulation in the western segment is the development degree of the trap and its closing height. The main controlling factor of hydrocarbon accumulation in the middle section of the channel is the fracture system of the communication channel sandstone and the lower source rock. In the eastern section of the channel, The development is the main factor controlling the hydrocarbon accumulation. The entire lower channel shows the structural pattern of the West High and the East low, and the oil and gas gather from east to west. Therefore, the middle and lower sections of the lower channel are favorable exploration areas.