本文選題：伸展　切入點：走滑　出處：《石油與天然氣地質(zhì)》2017年01期

【摘要】：南部斷階帶為蘇北盆地高郵凹陷邊界構(gòu)造帶,由吳堡斷階帶和真武斷階帶兩個部分組成,具有復雜的構(gòu)造作用過程和構(gòu)造樣式。在南部斷階帶幾何學特征研究基礎(chǔ)上,以應(yīng)力-應(yīng)變分析理論為指導,利用平衡剖面法反演所得的伸展率進行橫向?qū)Ρ?明確高郵凹陷各時期的優(yōu)勢伸展方位,從而分析南部斷階帶的構(gòu)造作用及其對構(gòu)造樣式的控制。結(jié)果表明,高郵凹陷優(yōu)勢伸展方位經(jīng)歷了NW向(K_2t~2—E_2d),NS向(E_2s)和NW向(Ny—Qd)的變化過程,首次從定量角度深入認識了高郵凹陷晚白堊世以來的構(gòu)造應(yīng)力場方向。由于不同時期優(yōu)勢伸展方位與斷階帶呈不同角度斜交,吳堡斷階帶經(jīng)歷了純伸展、右行走滑-伸展與純伸展3期構(gòu)造作用,形成了平面斜交式和剖面馬尾狀的簡單斷層組合樣式;真武斷階帶經(jīng)歷了左行走滑-伸展、右行走滑-伸展和左行走滑-伸展3期構(gòu)造作用,形成了平面網(wǎng)格式與剖面復式馬尾狀的復雜斷層組合樣式。伸展速率與走滑速率研究表明,斷階帶伸展與走滑作用主要發(fā)生在阜寧組、戴南組和三垛組,多期次的走滑-伸展作用是南部斷階帶構(gòu)造樣式的主要控制因素。
[Abstract]:The southern fault terrace is a boundary structural belt of Gaoyou depression in Subei basin, which is composed of two parts: Wubao fault terrace and Zhenwu fault terrace. It has complicated tectonic process and structural style. On the basis of the study of the geometric characteristics of the southern fault terrace zone, the southern fault terrace is composed of two parts: Wubao fault terrace and Zhenwu fault terrace. Under the guidance of the stress-strain analysis theory, the extension ratio obtained by the equilibrium section method is compared horizontally, and the dominant extension azimuth of each period in Gaoyou sag is determined. The result shows that the dominant extension orientation of Gaoyou sag has experienced the change of NW direction, 2t ~ 2-E _ 2d ~ +, NS _ S _ 2s) and NW direction _ Ny-Qd _ d _ (), the results show that the tectonic action of the southern fault terrace zone and its control on the structural style are analyzed. The direction of tectonic stress field since the late Cretaceous in Gaoyou sag was understood for the first time from a quantitative point of view. The Wubao fault zone experienced pure extension due to the different angles between the dominant extensional azimuth and the fault terrace in different periods. Right-strike-extensional and pure extensional tectonics formed a simple fault combination style of plane oblique type and section horsetail shape, while the Zhenwu fault terrace experienced left strike-slip extension, The structures of right strike-extensional and left-strike-extensional structures formed complex fault combination styles of plane grid type and section compound horsetail type. The study of extension rate and strike-slip rate shows that, The extension and strike-slip of the fault terrace mainly occurred in Funing formation, Dainan formation and Sanpong formation. The multi-stage strike-slip extension is the main controlling factor of the structural style of the southern fault terrace.
【作者單位】： 中國石油勘探開發(fā)研究院;中國石油大學(華東)地球科學與技術(shù)學院;中國石油東方地球物理公司新興物探開發(fā)處;
【基金】：國家自然科學基金項目(41472176)
【分類號】：P618.13

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