CAJ | 학술논문

沁水盆地南部蕴藏着丰富的煤系天然气资源，是目前我国煤系天然气资源勘探开发的重点区域。研究区构造简单，石炭-二叠系煤层厚度大、分布稳定，具有很高的煤系天然气含量。砂岩在石炭-二叠系各层位均有发育，厚度稳定，为该区最主要的煤系天然气储层。结合大量岩石薄片、压汞曲线资料、储层物性的分析，对沁水盆地南部石炭-二叠系砂岩储层的分布规律、岩石学特征、储集空间等进行了分析研究，探讨了影响砂岩储层发育的主要因素。研究表明，研究区砂体厚度从中南部向北部呈递减趋势；储层的岩石类型以细-中粒长石石英砂岩、石英长石砂岩为主，部分岩屑砂岩，矿物成分中石英含量占绝对优势，岩屑、长石次之；储集空间以粒间孔和粒内溶孔为主，微裂缝次之。物源、成岩作用、沉积相、砂岩粒径和埋藏方式等因素共同控制着砂岩储层的发育。
심수분지남부온장착봉부적매계천연기자원，시목전아국매계천연기자원감탐개발적중점구역。연구구구조간단，석탄-이첩계매층후도대、분포은정，구유흔고적매계천연기함량。사암재석탄-이첩계각층위균유발육，후도은정，위해구최주요적매계천연기저층。결합대량암석박편、압홍곡선자료、저층물성적분석，대심수분지남부석탄-이첩계사암저층적분포규률、암석학특정、저집공간등진행료분석연구，탐토료영향사암저층발육적주요인소。연구표명，연구구사체후도종중남부향북부정체감추세；저층적암석류형이세-중립장석석영사암、석영장석사암위주，부분암설사암，광물성분중석영함량점절대우세，암설、장석차지；저집공간이립간공화립내용공위주，미렬봉차지。물원、성암작용、침적상、사암립경화매장방식등인소공동공제착사암저층적발육。
It holds a huge amount of unconventional gas resource in coal measure in southern Qinshui ba?sin, which is one of the key areas of gas resource in coal measure exploration and development in China. The structure in the study area is simple, meanwhile, the distribution of Carboniferous- Permian coal seam which has a large thickness is stable, which means a very high content of unconventional gas in coal measure. In every strata of Carboniferous- Permian, sandstone developed well with a stable thick?ness, thus turned into the main reservoir of gas in coal measure in the region. Combined with a large num?ber of cast sections and mercury injection curve data and the physical property analysis of reservoir, the distribution of sandstone reservoir of Carboniferous-Permianin southern Qinshui basin and the petrology characteristics, reservoir space and so on had been taken into analysis and research, we discussed the main factors which influence the development of sandstone reservoir. The research shows that the thick?ness of sand body in the study area decreases from south to north;the reservoir lithology is mainly fine-grain feldspar quartz-sandstone and quartz feldspar-sandstone, followed by lithic sandstone; mineral composition dominated by quartz content, debris, feldspar followed;reservoir space is mainly intergranu?lar pore and intragranular dissolved pore and micro crack followed. The provenance, diagenesis, sedimen?tary facies, sandstone factors such as particle size and buried way jointly controlled the development of sandstone reservoir.