本文選題：索倫-林西地區(qū)　切入點(diǎn)：中上二疊統(tǒng)　出處：《吉林大學(xué)》2015年碩士論文

【摘要】：內(nèi)蒙古索倫-林西地區(qū)晚古生代地層發(fā)育,尤其是中上二疊統(tǒng)哲斯組和林西組在研究區(qū)內(nèi)廣泛分布。綜合分析表明:中二疊統(tǒng)哲斯組沉積時(shí)期,研究區(qū)主要為灰泥質(zhì)淺海-泥質(zhì)淺海-扇三角洲沉積體系;晚二疊世林西組沉積時(shí)期,地殼開始抬升,研究區(qū)由淺海相過渡為陸相環(huán)境,形成了扇三角洲-半深湖沉積體系。索倫-林西地區(qū)中上二疊統(tǒng)暗色泥頁巖分布面積較廣,厚度較大,巖性以深灰色、灰黑色、黑色泥頁巖及粉砂質(zhì)泥巖為主。通過研究區(qū)樣品全巖X射線衍射定量測試表明,哲斯組和林西組泥頁巖脆性礦物含量主要介于59.1%-82.7%,成分以石英和長石為主,具有較高的脆性指數(shù),利于產(chǎn)生裂縫/改善運(yùn)移通道和儲(chǔ)集空間;哲斯組和林西組泥頁巖粘土礦物較低,其平均含量為29.8%-37.1%,且粘土礦物類型以伊利石為主,對后期儲(chǔ)層壓裂改造有利。場掃描電鏡及儲(chǔ)集物性分析表明,索倫-林西地區(qū)中上二疊統(tǒng)哲斯組和林西組泥頁巖微孔隙、微裂隙發(fā)育,孔隙類型主要以粒間孔隙和粒內(nèi)孔隙為主,孔隙直徑一般為1-3μm,最大為8μm;孔隙度平均為1.288%,最大為4.42%,基質(zhì)滲透率平均為0.0262×10-3μm2,最大為0.2758×10-3μm2,與國內(nèi)外已發(fā)現(xiàn)頁巖氣盆地相比,研究區(qū)中上二疊統(tǒng)泥頁巖儲(chǔ)層具有一定的頁巖氣儲(chǔ)集條件,并具有可開發(fā)造縫的巖石學(xué)特征。綜合索倫-林西地區(qū)中上二疊統(tǒng)泥頁巖巖石學(xué)、地球化學(xué)以及儲(chǔ)層空間類型等特征,并對比國內(nèi)外頁巖氣成藏條件,分析得出研究區(qū)中上二疊統(tǒng)哲斯組和林西組的頁巖氣成藏前景廣闊,具有較大的頁巖氣資源勘探潛力。初步預(yù)測霍林郭勒地區(qū)、突泉盆地和扎魯特盆地的東北區(qū)為中上二疊統(tǒng)頁巖氣勘探前景區(qū)。
[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，

本文編號：1711445