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川东石炭系黄龙组由于优越的储集条件,近年来一直作为天然气勘探的主要对象。该文运用层序地层学的理论和研究方法对川东石炭系进行层序地层研究,阐述了层序顶、底界面的类型及其识别特征、层序内岩石组合特征、岩石的沉积环境、低频层序的划分及高频层序的划分。认为川东石炭系黄龙组为I型层序,通过界面识别和与邻区的对比,将川东石炭系划分为一个三级层序,三个四级层序,七个五级层序。通过联井对比,建立了研究区石炭系层序地层的等时格架。
Due to the superior reservoir conditions, the eastern Sichuan Carboniferous Huanglong Formation has been the main target of natural gas exploration in recent years. In this paper, the theory and method of sequence stratigraphy are used to study the sequence stratigraphy of the eastern Sichuan Carboniferous. The types and identification features of the top and bottom interface of the sequence, the characteristics of rock assemblages in the sequence, the sedimentary environment of the rock, Division of low frequency sequence and high frequency sequence division. It is considered that the Huanglong Formation in eastern Sichuan Province is a type I sequence. By means of interface recognition and comparison with the adjacent areas, the eastern Sichuan Carboniferous is divided into a third-order sequence, a third-order fourth-order sequence and a seventh-fifth order sequence. By connecting well, an isochronal framework of Carboniferous sequence stratigraphy has been established in the study area.