新疆三塘湖盆地页岩气成藏特征

发布时间：2018-05-20 10:50

  本文选题：新疆 + 三塘湖盆地　； 参考：《新疆大学》2015年硕士论文

【摘要】：论文应用石油地质学、盆地分析、层序地层学、沉积学、地球化学、有机岩石学、古生物学等理论和方法并结合已有的资料对三塘湖盆地页岩气形成机理、富集规律进行分析,通过国内外研究对比发现,三塘湖盆地页岩气潜力巨大。指出三塘湖盆地主要来自于古生界石炭系和下二叠系湖相泥页岩、古生界中二叠系条湖组和芦草沟组湖相泥页岩、中生界上三叠系和下侏罗系三套泥页岩。对盆地的烃源岩分布范围和埋深、有机质丰度、有机质类型、有机质成熟度、裂缝和孔隙、渗透率以及脆性物质含量等分析研究,认为三塘湖盆地具备了页岩气成藏的基本条件。分析认为侏罗系-三叠系烃源岩有机质类型主要以Ⅱ2~Ⅲ1型为主,属于低~中等成熟度;二叠系烃源岩主要以Ⅲ型,Ⅱ-Ⅰ2型为主;石炭系有机质类型主要以Ⅱ型为主,主要处于成熟阶段,甚至高成熟阶段。侏罗系的烃源岩主要为中下统的水西沟群,生烃中心为条湖凹陷和马郎凹陷。整个三塘湖盆地页岩气的分布主要受到烃源岩的分布和缝隙分布的控制,储层裂缝和孔隙较为发育,脆性物质含量在50%以上,三叠系的小泉沟组烃源岩主要集中在汉水泉凹陷和条湖凹陷。二叠系条湖组和芦草沟组湖相烃源岩主要分布在条湖凹陷及马朗凹陷的南缘,最具生烃潜力,是盆地内最好的烃源岩,其次为石炭系,稍差的为侏罗系-三叠系。盆地页岩气主要通过吸附作用赋存在储层中,主要是在干酪根和页岩颗粒表面或是溶解在干酪根中,游离气含量较少,在储层中生成之后发生大规模滞留。整个盆地的页岩埋深在3500m以上,单层厚度为40m-50m左右,十分有利于页岩气的储存。通过测井分析,三塘湖盆地岩电特征明显,二叠系气测异常显示较好,石炭系气测异常显示活跃,气测组分特征纵向上总体表现为:侏罗系呈“高甲烷”特征;三叠系、二叠系呈“中甲烷”特征;石炭系呈“低甲烷”特征。根据综合分析,圈出三塘湖盆地页岩气储存的有利目标区,主要为马郎凹陷二叠系芦草沟组的马7区块,为三塘湖盆地页岩气的勘探开发提供了依据。
[Abstract]:Based on the theories and methods of petroleum geology, basin analysis, sequence stratigraphy, sedimentology, geochemistry, organic petrology and paleobiology, and combining with the available data, this paper analyzes the formation mechanism and enrichment law of shale gas in the Santanghu Basin. It is found that the potential of shale gas in Santanghu basin is great. It is pointed out that the Santanghu basin is mainly from Paleozoic Carboniferous and Lower Permian lacustrine shale, Paleozoic Middle Permian Tianhu formation and Lucaogou formation lacustrine shale, Mesozoic Upper Triassic and Lower Jurassic three sets of shale. The distribution and depth of hydrocarbon source rocks, the abundance of organic matter, the type of organic matter, the maturity of organic matter, the fractures and pores, the permeability and the content of brittle matter in the basin are analyzed and studied. It is considered that the Santanghu Basin possesses the basic conditions for shale gas accumulation. It is considered that the organic matter types of Jurassic-Triassic source rocks are mainly of type 鈪，

本文编号：1914320