工程地质学报
工程地質學報
공정지질학보
2014年
5期
997-1002
,共6页
关进安%梁德青%万丽华%谷任国
關進安%樑德青%萬麗華%穀任國
관진안%량덕청%만려화%곡임국
含水合物沉积层%SH2站位%成藏动力学%水合物动力学反应%饱和度
含水閤物沉積層%SH2站位%成藏動力學%水閤物動力學反應%飽和度
함수합물침적층%SH2참위%성장동역학%수합물동역학반응%포화도
Hydrate-bearing sediments%Site SH2%Accumulation dynamics%Kinetics of hydrate reaction%Saturation
南海北部神狐区域海底的高丰度水合物储层与生物成因为主的甲烷气源表明该区域很可能是一种特殊的复合型海洋水合物系统,其成藏动力学机制有待进一步的研究和澄清。建立了一个耦合沉积层地质属性-流体流动过程-水合物反应动力学的传输-反应模型,区别了两种不同类型的水合物形成(分解)动力学过程:(1)在通常情况下溶解甲烷和游离气共同形成水合物,(2)特殊情况下游离气直接生成水合物,结果表明在神狐海域热力学环境下游离气形成水合物速度比溶解甲烷快约4倍,气体含量和动力学常数比值越大生成水合物越快,而对比水合物分布的模拟结果与实测数据表明该区域水合物储层聚集和产状很可能受到了其他地质活动的影响。
南海北部神狐區域海底的高豐度水閤物儲層與生物成因為主的甲烷氣源錶明該區域很可能是一種特殊的複閤型海洋水閤物繫統,其成藏動力學機製有待進一步的研究和澄清。建立瞭一箇耦閤沉積層地質屬性-流體流動過程-水閤物反應動力學的傳輸-反應模型,區彆瞭兩種不同類型的水閤物形成(分解)動力學過程:(1)在通常情況下溶解甲烷和遊離氣共同形成水閤物,(2)特殊情況下遊離氣直接生成水閤物,結果錶明在神狐海域熱力學環境下遊離氣形成水閤物速度比溶解甲烷快約4倍,氣體含量和動力學常數比值越大生成水閤物越快,而對比水閤物分佈的模擬結果與實測數據錶明該區域水閤物儲層聚集和產狀很可能受到瞭其他地質活動的影響。
남해북부신호구역해저적고봉도수합물저층여생물성인위주적갑완기원표명해구역흔가능시일충특수적복합형해양수합물계통,기성장동역학궤제유대진일보적연구화징청。건립료일개우합침적층지질속성-류체류동과정-수합물반응동역학적전수-반응모형,구별료량충불동류형적수합물형성(분해)동역학과정:(1)재통상정황하용해갑완화유리기공동형성수합물,(2)특수정황하유리기직접생성수합물,결과표명재신호해역열역학배경하유리기형성수합물속도비용해갑완쾌약4배,기체함량화동역학상수비치월대생성수합물월쾌,이대비수합물분포적모의결과여실측수거표명해구역수합물저층취집화산상흔가능수도료기타지질활동적영향。
The deposit in Shenhu area is a kind of complicated marine hydrate system.Thus the mechanism of its dynamic accumulation still needs to be further studied and clarified.A flow-transport-reaction model,coupled with the kinetic characteristic of hydrate reaction,has been established to evaluate the formation of the hydrate deposits. Two types of the marine hydrate systems,one formed by only dissolved methane and the other formed by both dissolved methane and free gas,have been respectively discussed about how they contribute to the accumulation of the hydrate-bearing sediments.The hydrate saturation at the bottom of hydrate stable zone has been deduced,and the influences of the free gas content and the hydrate kinetic characteristics have also been studied to examine the collection process of hydrate deposits in this area.The results imply that certain kinds of special geologic events have happened to transform the formation and aggregation of the hydrate deposits in this area.