松辽盆地北部泉三段河流相层序地层界面识别研究

Study on Recognition of Sequence Boundaries of Fluvial Facies in the Quan 3 Members of the North of Songliao Basin

河流相是松辽盆地北部下白垩统泉三最主要的沉积相类型,也是重要的油气储集层。河流相层序地层界面的划分又是河流相分析的基础和前提,故河流相层序地层界面的识别研究对松辽盆地北部油气储层的勘探开发有重要的意义。以河流相沉积学研究为基础,阐述了构造沉降、气候变化以及沉积物供应对盆地层序形成与发育的影响。并运用高分辨率层序地层理论和研究方法,通过对目的段取芯井岩芯的观察,得出了河流相层序界面识别的岩石学标志;利用测井曲线的突变和地震剖面中的不整合识别出了层序界线。

Fluvial facies are not only the main sedimentary facies in the quan 3 members of the north Lower Crataceous in Songliao Basin, but also are very important oil reservoirs. The division of sequence boundaries of fluvial facies is the basement and premise of the fluvial facies analysis. Therefore, study on recognition of sequence boundaries of fluvial facies has important significance for exploring oil reservoirs in the north of Songliao Basin. In this paper, based on the fluvial facies sedimentology, the influence of tectonic subsidence, climatic variation anU sedimentary deposition on the generation and development of the sequence in the basin is studied. Base on high-resolution sequence stratigraphy theory and research methods, through observing target stratum drilling core of core well petrology logos of fluvial sequence boundary are obtained, and the sequence boundaries are identified by mutations in logging and seismic profile unconformity.