普光气田飞仙关组层序特征及有利储层分析

The sequence characteristics and favorable reservoir of Feixianguan Formation in Puguang Gasfield

为了对普光气田主体碳酸岩沉积体系和各种微相特征深入研究,建立区域地层格架,对普光气田主体井层序界面进行识别与划分。研究表明:主要发育有升隆侵蚀层序不整合面、海侵上超层序不整合面、水下沉积间断层序不整合面、局部暴露层序不整合界面和岩性岩相转换界面等五种三级层序界面,同时发育岩性的突变面、沉积相转换面、GR值正向漂移和成岩作用变化等四种四级层序界面。普光102-1井下三叠统飞仙关组可划分为一个二级层序、两个三级层序和九个四级层序,并对其中可作为有利储层的层序进行分析。

In order to take in-depth research of the characteristics of the main carbonate sedimentary system and a variety of micro-phase in Puguang Gasfield,and establish the regional stratigraphic framework of the Puguang gas field,we identify and classify the sequence boundary of main wells in Puguang Gasfield.Five kinds of grade Ⅲ sequence boundaries developed,such as a unconformity sequence surface of the upwarped erosion,transgressive sequence on the super-unconformity surface,subaquatic unconformity sequence surface of the interruption in deposition,unconformity sequence surface of the local exposure,and conversion interface of the lithology and the lithofacies.Four kinds of the grade Ⅳ sequence boundaries developed such as the surface of discontinuity of the lithology,conversion surface of the sedimentary facies,the surface of the positive drift of the GR value,and the surface of the alternation of the diagenic metamorphism.Lower Triassic Feixianguan Formation of Puguang 102-1 well can be divided into one grade Ⅱsequence,two grade Ⅲsequences and nine grade Ⅳsequences,and some analysis was done to sequences can be used as favorable reservoir.