河西走廊石炭系泥页岩非常规油气勘探潜力分析  

Analysis of exploration potential for Carboniferous shale in the Hexi Corridor

作　　者：甘元露 Gan Yuanlu(Sinopec Exploration Company,Sichuan Chengdu 610041)

机构地区：[1]中国石油化工股份有限公司勘探分公司,四川成都610041

出　　处：《陕西地质》2024年第1期36-44,共9页Geology of Shaanxi

摘　　要：河西走廊石炭系盆地群上石炭统优质泥页岩发育,其埋藏深度1200-3000m,厚度超170m;孔隙度2-4%,渗透率0.02~0.08×10^(-3)μm^(2),物性较好;以Ⅲ型干酪根为主,少量Ⅱ2型干酪根,有机质含量高平均TOC含量达3.28%,平均Ro1.3%左右,处于生油生气阶段,具备优质的烃源条件;岩心含气性较高,泥页岩2~3m^(3)/t,煤层6~8m^(3)/t;地层脆性指数可达70%,具备较好的可压性。通过河西走廊石炭系与四川盆地几种不同类型非常规油气勘探目的层的油气地质条件对比研究,认为泥页岩脆性指数与粘土中矿物成分是影响非常规油气勘探的重要因素。综合分析认为河西走廊石炭系泥页岩烃源条件好、脆性指数高,具备良好的非常规油气勘探前景。The Upper Carboniferous shale found within the Hexi Corridor Basin group exhibits favorable physical properties,including burial depths ranging from 1200 to 3000 m and thicknesses exceeding 170 m.These shales possess a porosity of 2-4%,permeability of 0.02-0.08×10^(-3)μm^(2),and organic matter content averaging 3.28%TOC.The presence of Type Ⅲ kerogen,with minor amounts of Type Ⅱ2 kerogen and a high Ro of approximately 1.3%,indicates that the shale is in the early stage of oil and gas generation,making it an excellent hydrocarbon source.Furthermore,shale has a high gas content of 2-3 m^(3)/t in shale and 6-8 m^(3)/t in coal seams.The britleness index of the rock was 70%,indicating good flexibility.The analysis of unconventional exploration targets in the Sichuan Basin suggests that the brittleness index of shale and the composition of clay minerals are crucial factors affecting unconventional oil and gas exploration.The Carboniferous shale in the Hexi Corridor,owing to its good hydrocarbon source conditions and high brttleness index,presents promising prospects for unconventional oil and gas exploration.

关 键 词：河西走廊 石炭系 泥页岩 油气勘探 

分 类 号：P618.130.2[天文地球—矿床学]