發(fā)布時間：2018-05-28 06:30

  本文選題：珠一坳陷 + 裂后期��； 參考：《地球科學》2017年01期

【摘要】：珠江口盆地裂后期斷裂作用對新近系油氣成藏具有重要影響,但人們對其發(fā)育特征及動力學演化規(guī)律的認識一直不夠.利用鉆井約束的高精度三維及二維地震資料對珠一坳陷裂后期斷裂的幾何學與運動學特征進行了分析,結(jié)果表明珠一坳陷裂后期存在南海期和東沙期兩期斷裂作用,從南海期斷裂作用到東沙期斷裂作用,斷裂的幾何學、運動學特征以及動力學機制均發(fā)生了轉(zhuǎn)換.南海期斷裂作用具有從南向北遷移的特征;而東沙期斷裂具有由東向西遷移的特征.兩期斷裂都以伸展為主,其中東沙期斷裂具有微弱扭性特征.南海期斷裂區(qū)域伸展方向為NNE10°~15°,東沙期為NNE20°~25°,區(qū)域伸展方向發(fā)生了5°~10°的順時針偏轉(zhuǎn).南海期斷裂作用發(fā)生于南海同擴張期,可能與南海擴張期間北部陸緣殘留的伸展作用有關(guān).東沙期斷裂作用形成于南海后擴張期的東沙運動,該時期區(qū)域主應(yīng)力軸σ_2方向與呂宋島弧和歐亞大陸的擠壓碰撞方向一致.東沙期斷裂特征進一步證實了東沙運動是中中新世以來呂宋島弧與歐亞大陸碰撞的結(jié)果.研究結(jié)果對整個南海地區(qū)裂后期南海運動與東沙運動的進一步認識具有重要意義.
[Abstract]:The late faulting in the Pearl River mouth basin has an important influence on the formation of Neogene oil and gas reservoirs, but the characteristics of its development and the law of its dynamic evolution have not been well understood. The geometric and kinematic characteristics of the late fault in the Zhu-1 depression are analyzed by using the high-precision 3-D and two-dimensional seismic data constrained by drilling. The results show that there are two stages of faults in the late period of the Zhu-depression: the South China Sea period and the Dongsha period. From the South China Sea fault to the Dongsha fault, the geometry, kinematics and dynamic mechanism of the fault have been transformed. The fault in the South China Sea has the characteristics of migration from south to north, while the fault in Dongsha period has the characteristics of migration from east to west. The two faults are mainly extensional, and the Middle East Sand faults have weak torsional characteristics. The extension direction of the South China Sea fault zone is NNE10 擄15 擄, and the east sand stage is NNE20 擄25 擄. The regional extension direction has a clockwise deflection of 5 擄~ 10 擄. The fault in the South China Sea occurred in the South China Sea and the extension of the northern continental margin during the extension of the South China Sea. The fault in the Dongsha period was formed in the east sand movement in the post-spreading period of the South China Sea. The 蟽 _ 2 direction of the principal stress axis in this period is consistent with the direction of compressional collision between the Luzon Island arc and the Eurasian continent. The characteristics of the Dongsha fault further confirm that the Dongsha movement is the result of the collision between the Luzon Island Arc and the Eurasian continent since the Miocene. The results are of great significance to the further understanding of the South China Sea movement and the Dongsha movement in the late period of the South China Sea.
【作者單位】： 中國地質(zhì)大學構(gòu)造與油氣資源教育部重點實驗室;中海石油有限公司深圳分公司研究院;
【基金】：國家科技重大專項(No.2011ZX05023-001-015)
【分類號】：P618.13

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