松辽盆地北部嫩江组非海相层序地层特征

松辽盆地油气资源丰富,盆地北部含油气组合上白垩统嫩江组勘探步伐逐渐放缓,原因之一是对该套地层的层序地层样式认识不够深入造成的。依据地震、岩心及测井资料,应用经典层序地层学理论,对嫩江组进行层序界面识别并建立层序地层格架,同时创新性地建立了不同因素控制下的层序地层成因模式,提出不同模式具有不同的储层发育特点,尝试从一个新的角度为研究区储层预测及油气勘探提供依据。研究认为,嫩江组可以划分为5个三级层序、10个体系域;创新性地认识到嫩江组发育2种独特的层序模式,分别是非海相坳陷湖盆海侵主控层序地层模式与陆相平缓坳陷湖盆层序地层模式。

Non-marine sequence stratigraphic characteristics of Nenjiang Formation,Northern Songliao Basin

Songliao Basin is abundant in oil and gas resources;however,the petroleum exploration of the upper Cretaceous Nenjiang Formation in the northern part of the basin has gradually slowed down.One of the main reasons is the lack of understanding in the sequence stratigraphic pattern of the formation.Based on the seismic,core and well logging data and applying the classical theory of sequence stratigraphy,the sequence boundaries have been recognized and sequence stratigraphy frame of Nenjiang Formation were established.The sequence genetic models under different control factors have been built.Different models have different reservoir development characteristics and the foundations of reservoir prediction and hydrocarbon exploration in a new perspective have been summarized.The Nenjiang Formation is now divided into 5 third-order sequences and 10 system tracts.Nenjiang Formation sequence stratigraphic models are divided into two types,which are transgressive master sequence stratigraphic model of non-marine depression basin and sequence stratigraphic model of continental gentle depression basin.