渤海灣盆地大歧口凹陷變換構(gòu)造與板內(nèi)變形差異
發(fā)布時(shí)間：2018-10-20 14:51
【摘要】：以大歧口凹陷大面積高精度三維地震資料為基礎(chǔ),并結(jié)合前人的研究成果,系統(tǒng)分析了大歧口凹陷變換構(gòu)造與板內(nèi)其他塊體間的變形差異。從對(duì)不同級(jí)別構(gòu)造的控制作用分析,大歧口凹陷的變換構(gòu)造帶可以劃分為3個(gè)級(jí)別:(1)近南北向的主變換帶(也稱一級(jí)變換帶),自西向東依次為孔店東變換帶、沿岸變換帶和羊二莊變換帶,分別對(duì)應(yīng)了大歧口凹陷西部、沿岸和羊二莊3條基底走滑斷裂帶。這3個(gè)主變換帶起到了協(xié)調(diào)大歧口凹陷東西兩側(cè)構(gòu)造樣式差異的作用。(2)近東西向的次變換帶(也稱二級(jí)變換帶),自北向南依次對(duì)應(yīng)大歧口凹陷的漢沽、海河-新港和歧中3條控凹斷裂。這3條近東西向的控凹斷裂起到了調(diào)節(jié)黃驊坳陷北、中、南三區(qū)變形差異的作用,致使大歧口凹陷主變換構(gòu)造帶近南北向的發(fā)育。(3)三級(jí)變換帶,一般垂直于主控?cái)嗔寻l(fā)育,起到傳遞斷裂之間伸展量的作用。大歧口凹陷變換構(gòu)造帶主要有邊界主控?cái)鄬拥挠绊�、先期基底�?gòu)造的控制和新生代不均勻伸展作用的影響3個(gè)成因。變換構(gòu)造帶的存在和發(fā)育使大歧口凹陷內(nèi)部不同時(shí)期的不同塊體存在時(shí)空上的差異變形,造成了凹陷內(nèi)部構(gòu)造樣式的差異。受太平洋板塊后退式俯沖和印度-歐亞板塊擠壓碰撞作用的影響,黃驊坳陷新生代以來處于右旋拉張應(yīng)力場(chǎng)作用下,表現(xiàn)出早期裂陷、后期拉分?jǐn)嘞莸奶卣?其區(qū)域主構(gòu)造應(yīng)力場(chǎng)由孔店-沙四期的WNW—ESE向拉伸變?yōu)樯橙?東營期的NW—SE向拉伸,到新近紀(jì)又發(fā)展為近N—S向拉伸,總體呈順時(shí)針旋轉(zhuǎn),而這樣一個(gè)構(gòu)造演化過程正好可以用黃驊坳陷內(nèi)大歧口凹陷的發(fā)育和演化拉分模式來成功解釋。
[Abstract]:Based on the large area and high precision 3D seismic data in Dazikou sag and the previous research results, the deformation difference between the transformation structure of Dazikou sag and other blocks in the plate is analyzed systematically. Based on the analysis of the controlling effect of the structures of different grades, the transformation structural belts in Dazikou depression can be divided into three levels: (1) the main transformation zone near the north and south direction (also called the first-order transformation zone), and the transform belt from west to east is the Kongdian transform zone. The coastal transformation zone and the Yangerzhuang transform zone correspond to three strike-slip fault zones in the west of Dazikou depression, along the coast and in Yangerzhuang, respectively. These three main transformation zones play a role in coordinating the differences of structural styles between east and west sides of Dazikou depression. (2) the subtransformation zone near the east to west (also called the secondary transformation zone) corresponds to the Hangu sag of the Dazikou sag from north to south in turn. Haihe-Xingang and Qizhong three controlled concave faults. The three near-east-west trending controlled concave faults play an important role in regulating the difference of deformation in the north, middle and south areas of Huanghua depression, resulting in the development of the main transformation structural belt of Dazikou depression near the north to the north. (3) the third-order transformation zone is generally perpendicular to the development of the main controlled fault. Play a role in transmitting the amount of extension between the faults. The transformation structural belt of Dazikou sag is mainly affected by boundary controlled faults, the control of pre-basement structure and the influence of the inhomogeneous extension of Cenozoic. Because of the existence and development of the transformation structural belt, different blocks in different periods in Dazikou sag have different deformation in time and space, which results in the difference of structural styles in the sag. Under the influence of Pacific plate retrogression and India-Eurasian plate compression collision, Huanghua depression has been under the action of dextral tensioning stress field since Cenozoic, showing the characteristics of early rift and late tension fault depression. The stress field of the main structure in the region changed from WNW-ESE in Kongdian to stretching to NW-SE in San-Dongying period, and then to N-S extension in Neogene, with the overall clockwise rotation. Such a tectonic evolution process can be successfully explained by the development and evolution of Dazikou depression in Huanghua depression.
【作者單位】： 中國海洋大學(xué)海洋地球科學(xué)學(xué)院海底科學(xué)與探測(cè)技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;青島海洋科學(xué)與技術(shù)國家實(shí)驗(yàn)室海洋地質(zhì)功能實(shí)驗(yàn)室;國家海洋局海洋沉積與環(huán)境地質(zhì)重點(diǎn)實(shí)驗(yàn)室;中國石油大港油田公司;
【基金】：國家自然科學(xué)基金(41325009,41502185) 國家重點(diǎn)研發(fā)計(jì)劃(2017YFC0601400-1) 國家海洋局海洋沉積與環(huán)境地質(zhì)重點(diǎn)實(shí)驗(yàn)室開放基金(MASEG201702)
【分類號(hào)】：P618.13;P736.1
本文編號(hào)：2283488
[Abstract]:Based on the large area and high precision 3D seismic data in Dazikou sag and the previous research results, the deformation difference between the transformation structure of Dazikou sag and other blocks in the plate is analyzed systematically. Based on the analysis of the controlling effect of the structures of different grades, the transformation structural belts in Dazikou depression can be divided into three levels: (1) the main transformation zone near the north and south direction (also called the first-order transformation zone), and the transform belt from west to east is the Kongdian transform zone. The coastal transformation zone and the Yangerzhuang transform zone correspond to three strike-slip fault zones in the west of Dazikou depression, along the coast and in Yangerzhuang, respectively. These three main transformation zones play a role in coordinating the differences of structural styles between east and west sides of Dazikou depression. (2) the subtransformation zone near the east to west (also called the secondary transformation zone) corresponds to the Hangu sag of the Dazikou sag from north to south in turn. Haihe-Xingang and Qizhong three controlled concave faults. The three near-east-west trending controlled concave faults play an important role in regulating the difference of deformation in the north, middle and south areas of Huanghua depression, resulting in the development of the main transformation structural belt of Dazikou depression near the north to the north. (3) the third-order transformation zone is generally perpendicular to the development of the main controlled fault. Play a role in transmitting the amount of extension between the faults. The transformation structural belt of Dazikou sag is mainly affected by boundary controlled faults, the control of pre-basement structure and the influence of the inhomogeneous extension of Cenozoic. Because of the existence and development of the transformation structural belt, different blocks in different periods in Dazikou sag have different deformation in time and space, which results in the difference of structural styles in the sag. Under the influence of Pacific plate retrogression and India-Eurasian plate compression collision, Huanghua depression has been under the action of dextral tensioning stress field since Cenozoic, showing the characteristics of early rift and late tension fault depression. The stress field of the main structure in the region changed from WNW-ESE in Kongdian to stretching to NW-SE in San-Dongying period, and then to N-S extension in Neogene, with the overall clockwise rotation. Such a tectonic evolution process can be successfully explained by the development and evolution of Dazikou depression in Huanghua depression.
【作者單位】： 中國海洋大學(xué)海洋地球科學(xué)學(xué)院海底科學(xué)與探測(cè)技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室;青島海洋科學(xué)與技術(shù)國家實(shí)驗(yàn)室海洋地質(zhì)功能實(shí)驗(yàn)室;國家海洋局海洋沉積與環(huán)境地質(zhì)重點(diǎn)實(shí)驗(yàn)室;中國石油大港油田公司;
【基金】：國家自然科學(xué)基金(41325009,41502185) 國家重點(diǎn)研發(fā)計(jì)劃(2017YFC0601400-1) 國家海洋局海洋沉積與環(huán)境地質(zhì)重點(diǎn)實(shí)驗(yàn)室開放基金(MASEG201702)
【分類號(hào)】：P618.13;P736.1
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