地质科技情报
地質科技情報
지질과기정보
GEOLOGICAL SCIENCE AND TECHNOLOGY INFORMATION
2010年
2期
100-106
,共7页
天然气水合物%构造背景%大陆边缘%流体运移
天然氣水閤物%構造揹景%大陸邊緣%流體運移
천연기수합물%구조배경%대륙변연%류체운이
gas hydrate%tectonic setting%continent margin%fluid transport
大量的钻孔资料和地震剖面显示主动大陆边缘的增生楔和被动大陆边缘的俯冲-增生楔、断裂-褶皱系、底辟构造或泥火山、滑塌构造、海底扇、"麻坑"构造和陆地多年冻土区等多种地质构造背景是形成天然气水合物的有利场所,可形成构造圈闭型天然气水合物矿藏.这些地质构造背景一方面大多是深部热成因气、生物成因气或混合成因气体或流体向上运移到海底的通道,形成天然气水合物矿藏;另一方面也可能造成天然气水合物的温压环境改变,致使天然气水合物分解.海底滑塌亦可能是天然气水合物分解所致,是潜在的地质灾害.
大量的鑽孔資料和地震剖麵顯示主動大陸邊緣的增生楔和被動大陸邊緣的俯遲-增生楔、斷裂-褶皺繫、底闢構造或泥火山、滑塌構造、海底扇、"痳坑"構造和陸地多年凍土區等多種地質構造揹景是形成天然氣水閤物的有利場所,可形成構造圈閉型天然氣水閤物礦藏.這些地質構造揹景一方麵大多是深部熱成因氣、生物成因氣或混閤成因氣體或流體嚮上運移到海底的通道,形成天然氣水閤物礦藏;另一方麵也可能造成天然氣水閤物的溫壓環境改變,緻使天然氣水閤物分解.海底滑塌亦可能是天然氣水閤物分解所緻,是潛在的地質災害.
대량적찬공자료화지진부면현시주동대륙변연적증생설화피동대륙변연적부충-증생설、단렬-습추계、저벽구조혹니화산、활탑구조、해저선、"마갱"구조화륙지다년동토구등다충지질구조배경시형성천연기수합물적유리장소,가형성구조권폐형천연기수합물광장.저사지질구조배경일방면대다시심부열성인기、생물성인기혹혼합성인기체혹류체향상운이도해저적통도,형성천연기수합물광장;령일방면야가능조성천연기수합물적온압배경개변,치사천연기수합물분해.해저활탑역가능시천연기수합물분해소치,시잠재적지질재해.
Natural gas hydrates are an important potential energy source for the 21st century. Based on the published drilling data and seismic reflection profiles, the accretionary prism, fault-folded system, mud volcano/mud diapir, slide, submarine fan, pockmark and permafrost region were recognized for the tectonic settings of gas hydrate. On the one hand, this tectonics can be regarded as good conduits for the formation of gas hydrate deposits, and on the other hand, the deposits can be destructed by this tectonics. Gas hydrate concentration in sediments is relatively high because of rapid transport of gas from great depth along these highly permeable tectonic conduits. Hence, gas hydrates can be dissociated when their equilibrium conditions are broken by the tectonic movements or the heat flow transported along these tectonic conduits. This gas hydrate dissociation may also lead to the submarine landslide.
