【摘要】：走滑斷層的走滑量研究是構(gòu)造分析過程中的關(guān)鍵,本文運(yùn)用走滑斷裂拉張疊置部位的構(gòu)造物理模擬方法作為走滑量求取的手段,利用與自然界吻合程度較好的脆性-塑性雙層模型對(duì)走滑拉張疊置部位進(jìn)行模擬,發(fā)現(xiàn)疊置區(qū)主要發(fā)育與主邊界斷層呈80°~90°的橫向斷層(T斷層)和呈順時(shí)針45°的斜向斷層(R剪切)兩種類型的次級(jí)斷層。通過改變實(shí)驗(yàn)中走滑斷裂的疊置長(zhǎng)度、橫向間隔距離以及走滑量,計(jì)算不同實(shí)驗(yàn)中橫向斷層與斜向斷層數(shù)量的比例并對(duì)實(shí)測(cè)數(shù)據(jù)進(jìn)行擬合,結(jié)果顯示:(1)疊置長(zhǎng)度以及走滑量的增加或者橫向間隔距離的減小,都會(huì)導(dǎo)致橫向斷層與斜向斷層數(shù)量比的增加;(2)每組實(shí)驗(yàn)中的上述四個(gè)實(shí)測(cè)變量之間存在著特定的對(duì)數(shù)關(guān)系,通過對(duì)自然界中的走滑斷裂拉張疊置區(qū)進(jìn)行同比例縮小的構(gòu)造物理模擬實(shí)驗(yàn),獲得四者之間的函數(shù)關(guān)系,從而可以確定走滑量。將構(gòu)造物理模擬計(jì)算走滑量方法應(yīng)用于渤海海域遼東灣地區(qū)郯廬斷裂帶,得到其新構(gòu)造運(yùn)動(dòng)以來約發(fā)生了2.1 km的右旋走滑活動(dòng)。
[Abstract]:The study of strike-slip quantity of strike-slip fault is the key in the process of structural analysis. In this paper, the method of structural physical simulation of the extension and tension superposition of strike-slip fault is used as the means of calculating the strike-slip quantity. The brittleness plastic double layer model, which is in good agreement with nature, is used to simulate the superposition of strike-slip tension. It is found that there are two main types of secondary faults in the overlay area: transverse fault (T fault) with 80 擄~ 90 擄main boundary fault and oblique fault (R shear) with 45 擄clockwise. By changing the overlay length, transverse distance and strike-slip amount of strike-slip faults in experiments, the ratio of transverse faults to oblique faults in different experiments is calculated and the measured data are fitted. The results show that: (1) the increase of overlay length, the amount of strike-slip or the decrease of transverse distance will lead to the increase of the ratio of transverse fault to oblique fault; (2) there is a specific logarithmic relationship between the four measured variables in each group of experiments. The functional relationship between the four variables is obtained by the structural physical simulation experiment of the same proportion of the strike-slip fault tension and overlay area in nature. Thus, the amount of strike-slip can be determined. The authors apply the structural physical simulation method to calculate the strike-slip amount in the Tan-Lu fault zone of Liaodong Bay area in the Bohai Sea. The dextral strike-slip activity of about 2.1 km has occurred since the neotectonic movement.
【作者單位】： 中海石油(中國(guó))天津分公司渤海石油研究院;中國(guó)石油大學(xué)(華東)地球科學(xué)與技術(shù)學(xué)院;
【基金】：十二五國(guó)家科技重大專項(xiàng)課題(2011ZX05023-006-005)資助
【分類號(hào)】：P542

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