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川东地区石炭系黄龙组油气资源丰富,是四川盆地最重要的天然气产层之一。根据区域地质背景、岩心观察和测井特征等资料,将川东地区石炭系黄龙组划分为1个三级层序,Ⅰ型层序界面是该地区主要的层序界面,初始海泛面和最大海泛面可作为地层界线,并据此分为三个体系域:低位体系域(LST)、海侵体系域(TST)和早期高位体系域(EHST)。继而可划分出三个岩性段,黄龙组一段、黄龙组二段、黄龙组三段,其中,黄龙组一段与低位体系域相当,黄龙组二段与海侵体系域相当,黄龙组三段与早期高位体系域相当。
The Carboniferous Huanglong Formation in eastern Sichuan is rich in hydrocarbon resources and is one of the most important natural gas production zones in the Sichuan Basin. According to regional geological background, core observation and logging data, the Huanglong Formation of the Carboniferous in East Sichuan is divided into a third-order sequence, the first-type sequence boundary is the main sequence boundary, the initial sea surface and The maximum sea surface can be regarded as stratigraphic boundary and divided into three system domains: LST, TST and EHST. Which can be divided into three lithology segments, the first segment of the Huanglong Formation, the second segment of the Huanglong Formation and the third segment of the Huanglong Formation. The first segment of the Huanglong Formation is equivalent to the lower system tract, the second segment of the Huanglong Formation corresponds to the transgressive system tract, Equivalent to the early high-level system domain.