柴达木盆地德令哈坳陷石炭系页岩气系统评价

发布时间：2018-04-25 13:00

  本文选题：页岩气系统 + 石炭系　； 参考：《地学前缘》2016年05期

【摘要】：石炭系是柴达木盆地油气勘探的新层系,油气勘探程度低,但发育厚度大的高有机质丰度泥页岩,具有很好的页岩气资源潜力。通过对德令哈坳陷石炭系露头剖面进行实测和钻井岩心分析,明确石炭系泥页岩空间展布特征。测定样品有机地球化学参数、孔渗特征,并且进行等温吸附和渗流实验,分析其储集特征。结合德参1井盆地模拟分析,研究石炭系页岩气成藏事件,划分德令哈坳陷石炭系页岩气系统。研究表明:石炭系泥页岩广泛发育,埋深较大但未发生变质;泥页岩有机质丰度较高,有机质类型主要为Ⅱ2型和Ⅲ型,处于成熟—高成熟演化阶段;上石炭统泥页岩发育优于下石炭统;泥页岩表现为低孔低渗特征,孔隙度在1.89%~5.48%,渗透率为(0.115~2.7)×10-7μm2;上覆地层发育厚层泥页岩可以提供良好的盖层条件;古近纪末—现今为页岩气系统形成的关键时期;上石炭统克鲁克组钻遇天然气显示,证实了德令哈坳陷石炭系页岩气系统的存在。在泥页岩厚度、埋深、TOC含量、成熟度等条件综合评价基础上,将德令哈坳陷划分为德令哈页岩气系统与埃北页岩气系统。
[Abstract]:Carboniferous is a new series of oil and gas exploration in Qaidam Basin. The exploration degree of Carboniferous is low, but the shale shale with high organic matter abundance has a good potential of shale gas resources. The spatial distribution characteristics of Carboniferous shale in the Carboniferous are determined by measuring the outcrop profile of Carboniferous system in Delingha depression and analyzing the drilling core. The organic geochemical parameters, pore and permeability characteristics of the samples were measured, and isothermal adsorption and percolation experiments were carried out to analyze their reservoir characteristics. Based on the basin simulation analysis of Decan 1 well, the hydrocarbon accumulation events of Carboniferous shale gas are studied and the Carboniferous shale gas system in Delingha depression is divided. The results show that: Carboniferous shale is widely developed, buried deep but not metamorphosed, the organic matter abundance of shale is relatively high, and the organic matter types are mainly type 鈪，

本文编号：1801415