CAJ | 학술논문

鄂尔多斯韩城地区煤层气地质条件复杂，含煤沉积体系特征是影响煤层气富集的重要因素之一。通过对韩城地区石炭-二叠系含煤沉积特征的研究，发现太原组主要为潟湖-潮坪-障壁岛沉积和陆表海碳酸盐岩台地沉积，山西组主要为河控三角洲沉积。从主要可采煤层的沉积相变、煤层厚度变化、煤岩物性变化及煤层顶底板封盖特征方面分析了沉积作用对煤层气富集的影响。研究表明：3号煤厚度较小，甚至出现变薄尖灭的现象；5号煤在全区发育且厚度较大，横向连续性好。煤层顶底板主要以泥岩、砂岩、粉砂岩为主，其中以厚层泥岩为顶底板的结构稳定的煤层更有利于煤层气的富集成藏。白马滩镇以东地区为2套煤层的有利开发区块。
악이다사한성지구매층기지질조건복잡，함매침적체계특정시영향매층기부집적중요인소지일。통과대한성지구석탄-이첩계함매침적특정적연구，발현태원조주요위석호-조평-장벽도침적화륙표해탄산염암태지침적，산서조주요위하공삼각주침적。종주요가채매층적침적상변、매층후도변화、매암물성변화급매층정저판봉개특정방면분석료침적작용대매층기부집적영향。연구표명：3호매후도교소，심지출현변박첨멸적현상；5호매재전구발육차후도교대，횡향련속성호。매층정저판주요이니암、사암、분사암위주，기중이후층니암위정저판적결구은정적매층경유리우매층기적부집성장。백마탄진이동지구위2투매층적유리개발구괴。
The geological conditions for coalbed methane are complicated in Hancheng area of the Ordos Basin. The characteristics of coal-bearing depositional system work as the main controlling factor for the enrichment of coalbed methane. According to the features of coal-bearing sediments in Carboniferous and Permian in Hancheng area, the Taiyuan Formation constitutes of lagoon-tidal-barrier island sedimentation and carbonate flat sedimen-tation while the Shanxi Formation constitutes of fluvial-dominated delta sedimentation. The changes of sedimenta-tion, the thickness of coalbed, the petrophysical property and the lithology of roof and floor of coalbed are direct-ly concerned to analyze the influence of sedimentary environment on CBM enrichment. The coalbed no.3 is thin and even pinches out locally. The coalbed no.5, which is thick and stable, is widespread in the study area. The roof and floor of coalbed are mainly mudstone, sandstone and siltstone. The coalbed with stable structure and thick mudstone as roof and floor is favorable for the enrichment and accumulation of coalbed methane. The area to the east of Baimatan town is the exploration target for 2 sets of coalbed.