本文選題：孔隙水地球化學(xué) + 天然氣水合物模擬　； 參考：《地球化學(xué)》2017年03期

【摘要】：天然氣水合物是一種具有廣闊前景的清潔能源資源,但目前對海洋天然氣水合物預(yù)測方法有多種,利用淺層沉積物孔隙水地球化學(xué)示蹤沉積層深部天然氣水合物的方法,可以為海域天然氣水合物前期普查提供一個(gè)廉價(jià)有效的途徑。利用南海北部東沙海域D-5、D-8和D-F站位沉積物孔隙水硫酸根離子、溶解無機(jī)碳、鈣離子和鎂離子在剖面上的分布特征,模擬了3個(gè)站位甲烷供給通量及天然氣水合物可能的發(fā)育特征。計(jì)算結(jié)果表明,D-5、D-8和D-F站位到達(dá)甲烷-硫酸根氧化界面的甲烷通量分別為11.97×10~( 3) mol/(m~2·a)、5.98×10~( 3) mol/(m~2·a)和26.45×10~( 3) mol/(m~2·a),天然氣水合物形成的最大溫度梯度分別為0.058℃/m、0.020℃/m和0.149℃/m,計(jì)算的天然氣水合物頂界深度分別為海底之下170~197 m、378~386 m和79~98 m,甲烷通量對天然氣水合物頂界影響大,溫度對天然氣水合物發(fā)育頂界影響較小。結(jié)合研究區(qū)似海底反射層發(fā)育特征判斷,D-5和D-F站位深部沉積層中可能有天然氣水合物,D-8站位應(yīng)該沒有天然氣水合物發(fā)育。
[Abstract]:Natural gas hydrate is a kind of clean energy resource with broad prospect. However, there are many methods for predicting marine gas hydrate, which uses shallow sediment pore water to trace deep gas hydrate in sediments. It can provide a cheap and effective way for the preliminary survey of natural gas hydrate in the sea area. The distribution characteristics of sulfate ion, dissolved inorganic carbon, calcium ion and magnesium ion in sediment pore water of D-5 + D-8 and D-F stations in Dongsha sea area, northern South China Sea, were used, and the distribution characteristics of dissolved inorganic carbon, calcium and magnesium ions in the profile were analyzed. The methane flux at three stations and the potential development characteristics of natural gas hydrate were simulated. The calculated results show that the maximum temperature gradient of gas hydrate formation at D-5 ~ (-8) and D-F stations to the methane-sulfate oxidation interface is 11.97 脳 10 ~ (-3) mol/ (mt2a) 5.98 脳 10 ~ (3) mol/ (mt2a) and 26.45 脳 10 ~ (3) mol/ (m2a), respectively. The calculated maximum temperature gradient of gas hydrate formation is 0.058 鈩，

本文編號(hào)：2060771