本文關(guān)鍵詞：天然氣水合物和游離氣飽和度評價方法及其在南海北部的應(yīng)用　出處：《海洋地質(zhì)與第四紀(jì)地質(zhì)》2017年05期 　論文類型：期刊論文

  更多相關(guān)文章： 天然氣水合物 飽和度 各向同性 各向異性 速度 電阻率

【摘要】：飽和度是評價天然氣水合物資源量的重要參數(shù)之一,不同海域由于水合物微觀賦存狀態(tài)差異,評價方法不同。大量水合物鉆探取心顯示在珠江口盆地不同海域發(fā)現(xiàn)了不同類型的水合物,在東部海域發(fā)現(xiàn)了呈脈狀、塊狀、結(jié)核狀等裂隙內(nèi)形成肉眼可視的水合物,而神狐海域發(fā)現(xiàn)了呈分散狀充填在孔隙空間不同飽和度的水合物,兩種不同類型水合物層的測井異常響應(yīng)特征不同,評價飽和度方法不同。研究表明東部海域基于各向異性電阻率模型估算的水合物飽和度與壓力取心吻合,近海底發(fā)育的水合物層飽和度相對較低,約為10%,而基于各向同性模型估算水合物飽和度高達(dá)60%,遠(yuǎn)大于壓力取心飽和度。在碳酸鹽巖層,基于未固結(jié)地層各向同性與各向異性估算水合物飽和度大于氯離子異常估算水合物飽和度,而利用膠結(jié)模式估算水合物飽和度與氯離子吻合。利用地震資料,以測井為約束利用稀疏脈沖反演地層的速度或波阻抗,結(jié)合不同巖石物理模型分析,再通過線性擬合或循環(huán)迭代方法可以估算水合物飽和度體,研究水合物的空間分布。通過沿穩(wěn)定帶底界提取水合物飽和度屬性,發(fā)現(xiàn)神狐海域水合物呈不均勻分布,在局部峽谷脊部呈條帶狀特征。
[Abstract]:Saturation is one of the important parameters to evaluate the gas hydrate resources. A large number of hydrate drilling coring shows that different types of hydrates have been found in different sea areas of the Pearl River mouth basin, and veins and blocks have been found in the eastern sea area. In the nodule and other fractures, the visible hydrate is formed in the naked eye, while in the Shenhu sea area, the hydrates filled in the pore space with different saturation are found, and the logging abnormal response characteristics of the two different types of hydrate layers are different. The results show that the hydrate saturation estimated by anisotropic resistivity model is consistent with the pressure coring, and the saturation of hydrate layer developed near the sea floor is relatively low (about 10%). Based on the isotropic model, the hydrate saturation is estimated to be as high as 60%, which is much larger than the pressure coring saturation. The estimation of hydrate saturation based on the isotropy and anisotropy of unconsolidated strata is greater than that of chloride ion anomaly, while the cement model is used to estimate hydrate saturation in accordance with chlorine ion. The velocity or wave impedance of formation is inversed by sparse pulse with logging as constraint. Combined with different rock physical models, the hydrate saturation volume can be estimated by linear fitting or cyclic iteration method. By extracting the hydrate saturation properties along the bottom boundary of the stable zone, it is found that the hydrate distribution in Shenhu sea area is uneven, and that in the local canyon ridge, the hydrate is striped.
【作者單位】： 中國科學(xué)院海洋研究所海洋地質(zhì)與環(huán)境重點(diǎn)實(shí)驗(yàn)室;海洋國家實(shí)驗(yàn)室海洋礦產(chǎn)資源評價與探測技術(shù)功能實(shí)驗(yàn)室;美國地質(zhì)調(diào)查局丹佛能源中心;
【基金】：國家自然科學(xué)基金項(xiàng)目(41676041,41676040) 中國地調(diào)局南海水合物勘探項(xiàng)目(DD20160211)
【分類號】：P618.13;P744.4
【正文快照】： 3.美國地質(zhì)調(diào)查局丹佛能源中心,丹佛,美國80225)天然氣水合物是由水和碳?xì)錃怏w(主要是甲烷氣體)在低溫、高壓環(huán)境下生成的固態(tài)化合物。世界不同海域的水合物鉆探發(fā)現(xiàn)其在自然界中存在的形態(tài)多種多樣,它既可能均勻充填在沉積物的孔隙空間,也可能呈脈狀、塊狀、層狀或結(jié)核狀等似，

本文編號：1412739