CAJ | 학술논문

为客观评价湘西北地区页岩气资源勘探潜力，利用野外露头地质剖面资料、有机地球化学分析数据等研究了区内页岩气生气物质基础。研究结果表明，研究区黑色泥页岩厚度可从几十米高至两百余米，且从深水陆棚往斜坡方向黑色泥页岩厚度逐渐减薄。研究区黑色泥页岩有机碳含量平均为5.46％，热水喷口及其周边地区则平均高达8％以上。湘西北地区下寒武统牛蹄塘组泥页岩有机碳含量与其石英矿物含量之间具有正相关关系，深水陆棚区和斜坡区泥页岩有机碳含量与其黏土矿物含量之间则分别具有正、负相关关系，表明泥页岩中石英、黏土矿物含量可指示其有机质富集程度。湘西北地区下寒武统牛蹄塘组泥页岩有机质类型为Ⅰ型和Ⅱ1型，等效镜质组反射率均在2．5％以上，平均大于3％，达到了过成熟阶段。不难发现，湘西北下寒武统牛蹄塘组具有良好的页岩气生气物质基础。
위객관평개상서북지구혈암기자원감탐잠력，이용야외로두지질부면자료、유궤지구화학분석수거등연구료구내혈암기생기물질기출。연구결과표명，연구구흑색니혈암후도가종궤십미고지량백여미，차종심수륙붕왕사파방향흑색니혈암후도축점감박。연구구흑색니혈암유궤탄함량평균위5.46％，열수분구급기주변지구칙평균고체8％이상。상서북지구하한무통우제당조니혈암유궤탄함량여기석영광물함량지간구유정상관관계，심수륙붕구화사파구니혈암유궤탄함량여기점토광물함량지간칙분별구유정、부상관관계，표명니혈암중석영、점토광물함량가지시기유궤질부집정도。상서북지구하한무통우제당조니혈암유궤질류형위Ⅰ형화Ⅱ1형，등효경질조반사솔균재2．5％이상，평균대우3％，체도료과성숙계단。불난발현，상서북하한무통우제당조구유량호적혈암기생기물질기출。
To objectively evaluate the exploration potential of shale gas in Lower Cambrian Niutitang Formation ,northwestern Hunan ,the gas production material base of shale gas were investigated by the data of outcrops ,organic geochemistry ,etc .The results showed that black shale thickness can be from a few tens of meters to more than 200 meters .The development and distribution of the black shale thickness was controlled by sedimentary facies zone ,showing a gradually decreasing tendency from the water‐deep continental shelf facies to the slope facies .The total organic carbon (TOC) contents of the black shale were 5 .46 percent on average in the study area ,and more than 8 percent on average near the hydrothermal vents . There was a positive correlation between the total organic carbon contents of the black shale on the water‐deep continental shelf and both quartz mineral contents and clay mineral contents .While on the slope area , there was a positive correlation between the total organic carbon contents of the black shale and quartz mineral contents and a negative correlation between the total organic carbon contents of the black shale and clay mineral contents .The relationship between TOC and mineral compositions in the mud‐shale indicated that quartz and clay mineral contents can indicate the abundance degree of the organic matters . The equivalent vitrinite reflectance of the black shale was more than 3% on average ,indicating they were over mature .Kerogen from the black shale was Ⅰ and Ⅱ 1 .It is not hard to find that the shale gas in Lower Cambrian Niutitang Formation ,northwestern Hunan ,has good gas production material base .