地质科技通报2025，Vol.44Issue(5)：53-64,12.DOI:10.19509/j.cnki.dzkq.tb20240785
库车坳陷侏罗系克孜勒努尔组深部煤层特征及启示
Characteristics and enlightenment of deep coal rocks in the Jurassic Kizilnur Formation of Kuqa Depression
摘要
Abstract
[Objective]Current research on the Jurassic Kizilnur Formation coal seams in the Kuqa Depression mainly focuses on shallow sections,with limited study of deep coal seams.[Methods]To address unknown coal-rock characteristics,reservoir properties,and gas content in the Jurassic Kizilnur Formation coal seams,the geometric distribution characteristics,the characteristics of coal rock and coal quality,reservoir properties,adsorption properties,and gas content of the coal seam in this block were studied based on the following methods,such as drilling data,seismic data processing,wellbore analysis,sampling observation,gas measurement,pore permeability,and isothermal adsorption experiments.[Results]The deep coal seams in the research area are predominantly composed of primary structures,with vitrinite as the major organic component(average 62.2%),indicating type Ⅲ organic matter.The coal is of medium rank,generally characterized by medium-to-high volatile matter,ultra-low sulfur,and low to very low ash content.The average gas porosity is 7.10%,and the average permeability is 0.685×10-3 μm2.Furthermore,methane adsorption capacity is strongly influenced by macrinite reflectance,water content,and ash yield.In the Kuqa Depression,deep coal seams occur at burial depths of 2 000-5 000 m,are mainly distributed in the Northern Structural Zone,cover about 2 800 km2,with a maximum single-layer thickness of 22 m.The average gas content of the deep coal seam measured is 11.77 m3/t,indicating substantial resource potential.[Conclusion]Compared with shallow coal seams,the deep coal seams of the Kezilnur Formation in the study area are more strongly affected by burial depth,exhibit high maturation,and have achieved large-scale gas production,underscoring their exploration potential.Water saturation emerges as a critical factor controlling gas content in these seams.Notably,the Dibei gentle-slope platform in the Kuqa Depression offers particular advantages for CBM extraction due to favorable hydrological and geological attributes.关键词
库车坳陷/克孜勒努尔组/煤层/煤储层特征Key words
Kuqa Depression/Kizilnur Formation/coal seam/coal reservoir characteristic分类
天文与地球科学引用本文复制引用
赵亚汶,谢会文,严德天,王斌,易艳,李玲,杨果,程旺明..库车坳陷侏罗系克孜勒努尔组深部煤层特征及启示[J].地质科技通报,2025,44(5):53-64,12.基金项目
新疆维吾尔自治区"天池英才"项目(TC2025T01) （TC2025T01）
中国石油天然气集团有限公司科技项目(2023ZZ14YJ02) （2023ZZ14YJ02）
中国石油天然气股份有限公司科技专项项目(2022KT0201) （2022KT0201）
