發(fā)布時(shí)間：2018-04-27 12:30

  本文選題：構(gòu)造熱演化 + 數(shù)值模擬　； 參考：《地學(xué)前緣》2017年03期

【摘要】：熱流調(diào)查和構(gòu)造熱演化數(shù)值模擬是油氣地?zé)嵫芯坎豢苫蛉钡闹匾獌?nèi)容。沉積盆地在其演化過(guò)程中往往疊加了特殊構(gòu)造事件。通過(guò)熱流調(diào)查和構(gòu)造熱演化數(shù)值計(jì)算可以更好地約束這些特殊過(guò)程,重建更為真實(shí)的構(gòu)造熱演化歷史。該文通過(guò)對(duì)南海北部瓊東南盆地和珠江口盆地中段熱流變化特征分析和構(gòu)造熱演化數(shù)值模擬,探討了影響其熱流變化的主要因素。結(jié)果表明,瓊東南盆地可分3個(gè)熱流分區(qū):北部陸架與上陸坡區(qū)(50~70mW/m~2)、中央坳陷帶深水區(qū)(70~85mW/m~2)和盆地東部深水區(qū)高熱流帶(85mW/m~2);珠江口盆地中段從陸架往海盆方向熱流呈階梯式抬高,西江凹陷平均熱流為55mW/m~2,番禺低隆起為58mW/m~2,白云凹陷為70mW/m~2,下陸坡區(qū)為85mW/m~2;陸坡區(qū)高熱流不僅與巖石圈強(qiáng)烈減薄相關(guān),而且還受到巖石圈破裂時(shí)引起的深部熱物質(zhì)上涌的影響,后者對(duì)現(xiàn)今陸坡區(qū)還有約20mW/m~2的熱流貢獻(xiàn);瓊東南盆地東部高熱流值則主要受到晚中新世以來(lái)的巖體侵位熱事件的影響,巖體侵入熱事件對(duì)現(xiàn)今熱流值貢獻(xiàn)可達(dá)10~25mW/m~2。分析表明,在南海深水盆地開(kāi)展構(gòu)造熱演化數(shù)值計(jì)算時(shí),需要考慮沉積過(guò)程、海底擴(kuò)張以及巖漿活動(dòng)等影響因素。
[Abstract]:The investigation of heat flow and numerical simulation of tectonic thermal evolution are important contents of oil and gas geothermal research. During the evolution of sedimentary basins, special tectonic events are often superimposed. Through the investigation of heat flux and numerical calculation of tectonic thermal evolution, these special processes can be restrained better and a more real history of tectonic thermal evolution can be reconstructed. Based on the analysis of the characteristics of heat flux variation and the numerical simulation of tectonic thermal evolution in the Qiongdongnan Basin and the Pearl River Estuary Basin in the north of the South China Sea, the main factors affecting the variation of heat flux are discussed in this paper. The results show that the Qiongdongnan basin can be divided into three heat flow zones: the northern shelf and the upper slope area, the north shelf and the upper slope area, the deep water area of the central depression belt, the deep water area of the central depression, and the high heat flow zone of the eastern deep water area of the basin, the heat flow in the middle section of the Pearl River mouth basin is raised step by step from the continental shelf to the sea basin. The average heat flow in Xijiang sag is 55mW / mm2, Panyu low uplift is 58mW / mm2, Baiyun sag is 70mW / mt2, and downslope is 85mW / m2.High heat flux in continental slope is not only related to lithosphere thinning, but also affected by deep thermal material upwelling caused by lithosphere rupture. The latter contributes about 20mW/m~2 to the present continental slope, while the high heat flux in the eastern part of Qiongdongnan basin is mainly affected by emplacement heat events since late Miocene, and the contribution of intrusive heat events to the current heat flux is 1025 MW / mm2. The analysis shows that in the numerical calculation of tectonic thermal evolution in the deep-water basin of the South China Sea, the influence factors such as sedimentary process, undersea spreading and magmatic activity should be considered.
【作者單位】： 中國(guó)科學(xué)院邊緣海地質(zhì)重點(diǎn)實(shí)驗(yàn)室中國(guó)科學(xué)院南海海洋研究所;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41176050,41576036,41376059)
【分類號(hào)】：P314;P736

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本文編號(hào)：1810736