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结合地震、岩心、测井等资料 ,建立了开鲁盆地龙湾筒凹陷下白垩统等时层序地层格架 ;研究预测了各层序地层格架内沉积体系的分布。在此基础上采用含油气系统理论对该地区的油气成因、演化过程进行了研究 ,认为该凹陷下白垩统仅有一个含油气系统 ;并从层序地层学的角度剖析了该含油气系统的主力烃源岩是层序 2 (对应九佛堂组下部 )的泥岩 ,而非一般认为的整个九佛堂组 ,较好地解释了原九佛堂组上、下烃源岩在成熟度演化上的差异。此外 ,通过对含油气系统各要素的分析 ,评价了该区勘探潜力及有利的油气聚集区。
Based on the data of earthquakes, cores and logs, an isochronous sequence stratigraphic framework of the Lower Cretaceous in the Longwangou Depression of the Kaerlu Basin was established. The distribution of sedimentary systems within each sequence stratigraphic framework was studied and predicted. On the basis of this, the petroleum genesis and evolution process in this area was studied by using the theory of petroleum-bearing system. It is concluded that there is only one hydrocarbon-bearing system in the Lower Cretaceous of the depression; and the sequence stratigraphy of the petroleum system The main hydrocarbon source rocks are mudstone of Sequence 2 (corresponding to the lower part of Jiufotang Formation), rather than the whole Jiufutang Formation which is generally considered as a good explanation for the evolution of maturity of upper and lower source rocks The difference. In addition, through the analysis of the various elements of the petroleum system, the exploration potential and favorable hydrocarbon accumulation area in this area are evaluated.