现代地质
現代地質
현대지질
Geoscience
2015年
5期
1157-1163
,共7页
天然气水合物%微生物地球化学烃检测技术%冻土带%天峻木里
天然氣水閤物%微生物地毬化學烴檢測技術%凍土帶%天峻木裏
천연기수합물%미생물지구화학경검측기술%동토대%천준목리
gas hydrate%microbial geochemical exploration%permafrost zone%Muli of Tianjun
以青海省天峻县木里地区天然气水合物发现区为研究对象,以天然气水合物发现井作为正演模型,采用250 m ×500 m、100 m ×100 m 两种调查尺度,对陆地冻土区天然气水合物微生物地球化学烃检测技术的适用性进行了研究。结果显示:研究区有显著的微生物异常,指示下伏地层存在烃类富集;稀网格微生物调查查明烃类富集的有利区,而密网格调查很好地识别了天然气水合物分布的非均质性,与水合物钻探井所揭示的横向上天然气水合物分布不连续的特征一致。土壤吸附气的地球化学检测和分析,揭示研究区天然气水合物的气源十分复杂,主要为热成因的煤层气和油型气。研究结果为探索天然气水合物富集规律和勘探方向提供依据和参考。微生物地球化学勘查结果精细地刻画了冻土区天然气水合物分布规律及气源特征,结合地质学、地球物理、地球化学进行综合分析,为陆地天然气水合物的识别提供新的研究方法,同时降低天然气水合物的勘探风险,提高勘探的成功率。
以青海省天峻縣木裏地區天然氣水閤物髮現區為研究對象,以天然氣水閤物髮現井作為正縯模型,採用250 m ×500 m、100 m ×100 m 兩種調查呎度,對陸地凍土區天然氣水閤物微生物地毬化學烴檢測技術的適用性進行瞭研究。結果顯示:研究區有顯著的微生物異常,指示下伏地層存在烴類富集;稀網格微生物調查查明烴類富集的有利區,而密網格調查很好地識彆瞭天然氣水閤物分佈的非均質性,與水閤物鑽探井所揭示的橫嚮上天然氣水閤物分佈不連續的特徵一緻。土壤吸附氣的地毬化學檢測和分析,揭示研究區天然氣水閤物的氣源十分複雜,主要為熱成因的煤層氣和油型氣。研究結果為探索天然氣水閤物富集規律和勘探方嚮提供依據和參攷。微生物地毬化學勘查結果精細地刻畫瞭凍土區天然氣水閤物分佈規律及氣源特徵,結閤地質學、地毬物理、地毬化學進行綜閤分析,為陸地天然氣水閤物的識彆提供新的研究方法,同時降低天然氣水閤物的勘探風險,提高勘探的成功率。
이청해성천준현목리지구천연기수합물발현구위연구대상,이천연기수합물발현정작위정연모형,채용250 m ×500 m、100 m ×100 m 량충조사척도,대륙지동토구천연기수합물미생물지구화학경검측기술적괄용성진행료연구。결과현시:연구구유현저적미생물이상,지시하복지층존재경류부집;희망격미생물조사사명경류부집적유리구,이밀망격조사흔호지식별료천연기수합물분포적비균질성,여수합물찬탐정소게시적횡향상천연기수합물분포불련속적특정일치。토양흡부기적지구화학검측화분석,게시연구구천연기수합물적기원십분복잡,주요위열성인적매층기화유형기。연구결과위탐색천연기수합물부집규률화감탐방향제공의거화삼고。미생물지구화학감사결과정세지각화료동토구천연기수합물분포규률급기원특정,결합지질학、지구물리、지구화학진행종합분석,위륙지천연기수합물적식별제공신적연구방법,동시강저천연기수합물적감탐풍험,제고감탐적성공솔。
The gas hydrate-discovering area in Muli of Tianjun,Qinghai Province was chosen as the research ar-ea,and the gas hydrate-discovering well was chosen as the analog model in this test to study the applicability of the microbial geochemical exploration (MGCE)method in gas hydrate exploration.Two different sampling grids of 250 m ×500 m and 100 m ×100 m were used in this study.The results showed that the research area had significant microbial anomaly,indicating the presence of hydrocarbon enrichment.The sparse grid study showed a favorable area of hydrocarbon enrichment,and the tight grid investigation showed the detail distribution of gas hydrate.This result verified the previous research result.The source of gas hydrates in the research area were also studied using geochemical method,and the results showed a very complex source,mainly thermogenic coal-bed gas and oil-formed gas.This microbial geochemical exploration result can describe the detailed characteris-tics of the gas hydrate distribution and gas sources.Using geomicrobial,geochemical,geology and geophysical analysis (‘4G’),it can provide a new research method for the identification of gas hydrates in permafrost,and reduce the exploration risk and improve the success rate of exploration.