内蒙古索伦—林西地区中上二叠统泥页岩储集特征

发布时间：2018-04-04 19:56

  本文选题：索伦-林西地区　切入点：中上二叠统　出处：《吉林大学》2015年硕士论文

【摘要】：内蒙古索伦-林西地区晚古生代地层发育,尤其是中上二叠统哲斯组和林西组在研究区内广泛分布。综合分析表明:中二叠统哲斯组沉积时期,研究区主要为灰泥质浅海-泥质浅海-扇三角洲沉积体系;晚二叠世林西组沉积时期,地壳开始抬升,研究区由浅海相过渡为陆相环境,形成了扇三角洲-半深湖沉积体系。索伦-林西地区中上二叠统暗色泥页岩分布面积较广,厚度较大,岩性以深灰色、灰黑色、黑色泥页岩及粉砂质泥岩为主。通过研究区样品全岩X射线衍射定量测试表明,哲斯组和林西组泥页岩脆性矿物含量主要介于59.1%-82.7%,成分以石英和长石为主,具有较高的脆性指数,利于产生裂缝/改善运移通道和储集空间;哲斯组和林西组泥页岩粘土矿物较低,其平均含量为29.8%-37.1%,且粘土矿物类型以伊利石为主,对后期储层压裂改造有利。场扫描电镜及储集物性分析表明,索伦-林西地区中上二叠统哲斯组和林西组泥页岩微孔隙、微裂隙发育,孔隙类型主要以粒间孔隙和粒内孔隙为主,孔隙直径一般为1-3μm,最大为8μm;孔隙度平均为1.288%,最大为4.42%,基质渗透率平均为0.0262×10-3μm2,最大为0.2758×10-3μm2,与国内外已发现页岩气盆地相比,研究区中上二叠统泥页岩储层具有一定的页岩气储集条件,并具有可开发造缝的岩石学特征。综合索伦-林西地区中上二叠统泥页岩岩石学、地球化学以及储层空间类型等特征,并对比国内外页岩气成藏条件,分析得出研究区中上二叠统哲斯组和林西组的页岩气成藏前景广阔,具有较大的页岩气资源勘探潜力。初步预测霍林郭勒地区、突泉盆地和扎鲁特盆地的东北区为中上二叠统页岩气勘探前景区。
[Abstract]:The late Paleozoic stratigraphy developed in Suolun-Linxi area, Inner Mongolia, especially in the middle and upper Permian Desi formation and Linxi formation, which are widely distributed in the study area.The comprehensive analysis shows that the study area is mainly composed of muddy shallow sea muddy shallow sea fan delta system and late Permian Linxi formation during which the crust began to uplift during the depositional period of the Middle Permian Zesi formation.A fan delta-semi-deep lake sedimentary system was formed in the study area from the shallow sea facies to the continental environment.The dark shale of the Middle and Upper Permian in Soren Linxi area is widely distributed in area and thickness, and its lithology is mainly dark gray, gray black, black shale and silty mudstone.The quantitative X-ray diffraction measurements of the whole rock samples show that the content of brittle minerals in the shale of the Zesi formation and Linxi formation is mainly between 59.1 and 82.7, and the composition is mainly quartz and feldspar, and has a high brittleness index.The shale clay minerals of the Zhesi formation and Linxi formation are relatively low, with the average content of 29.8-37.1g, and the type of clay minerals is mainly Illite, which is favorable to the later fracturing reconstruction of reservoirs.Field scanning electron microscopy (SEM) and reservoir physical analysis show that the micropores and microfractures of shale in the Middle and Upper Permian Zhesi formation and Linxi formation are mainly intergranular and intragranular pores in the Sauron-Linxi area, and the main types of pores are intergranular pores and intragranular pores.瀛旈殭鐩村緞涓，

本文编号：1711445