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目前普遍认为琼东南盆地天然气来源于渐新统和中新统海相煤型烃源岩,对于始新统偏I型干酪根烃源岩的存在尚不明确,因此确定始新统烃源岩生烃可能性及其分布将为下一步勘探提供重要依据.琼东南盆地东部45块样品的流体包裹体系统测试分析以及天然气和轻烃地球化学特征分析结果表明,盆地东部气藏以油型气及油型-煤型混合气为特征,至少有4期天然气充注,其中第1期天然气充注与始新统烃源岩生排烃有关.由此认为,琼东南盆地东部可能发育始新统偏I型干酪根烃源岩,主要分布于松南-宝岛-长昌凹陷以及北礁凹陷.
It is generally accepted that natural gas in the Qiongdongnan Basin originated from the Oligocene and Miocene marine coal-derived source rocks. The existence of the source rocks of the Eocene I-type kerogen is not clear. Therefore, Hydrocarbon possibility and its distribution will provide an important basis for exploration in the next step.Analysis of fluid inclusion system of 45 samples in the eastern part of Qiongdongnan Basin and analysis of geochemical characteristics of natural gas and light hydrocarbon show that the eastern gas reservoirs are characterized by oil gas and Characterized by at least four natural gas infills, of which the first natural gas charge is related to the hydrocarbon generation and expulsion of the Eocene source rocks, suggesting that the Eocene may develop in the eastern Qiongdongnan Basin Type I kerogen source rocks are mainly distributed in Songnan-Baojian-Changchang Sag and Beijiao Sag.