本文關(guān)鍵詞： 生長指數(shù) 構(gòu)造遷移 烏倫古坳陷 中生代　出處：《河南理工大學(xué)學(xué)報(自然科學(xué)版)》2017年01期 　論文類型：期刊論文

【摘要】：為確定烏倫古坳陷東南部中生代早期斷裂構(gòu)造的活動規(guī)律和控制因素,在確定同沉積逆斷層引起的斷展褶皺軸面和組成的基礎(chǔ)上,對烏倫古坳陷東南部由紅巖斷階帶和陸梁隆起所夾持的三角區(qū)域內(nèi)中生代早期斷裂構(gòu)造生長指數(shù)進(jìn)行分析。在上三疊統(tǒng)白堿灘組(T_3b)沉積階段,烏東斷裂生長指數(shù)一般在1.5左右,紅盆斷裂多小于1.3,喀拉薩依斷裂多小于1.2;下侏羅統(tǒng)八道灣組至中侏羅統(tǒng)西山窯組(J_1b-J_2x)沉積階段,烏東斷裂在下侏羅統(tǒng)八道灣組(J_1b)沉積時期具有最大的生長指數(shù),紅盆斷裂在中侏羅統(tǒng)三工河組(J_1s)沉積時期具有最大的生長指數(shù),喀拉薩依斷裂在中侏羅統(tǒng)西山窯組(J_2x)沉積時期具有最大的生長指數(shù)。在斷裂走向方向上,紅盆和喀拉薩依斷裂具有最南東端(或東端)生長指數(shù)較小,并接近于1,然后向北西(或西)方向生長指數(shù)逐漸增大,然后又逐漸減小至生長指數(shù)等于1的變化規(guī)律;烏倫古坳陷東南部烏東斷裂、紅盆斷裂和喀拉薩依斷裂在上三疊統(tǒng)白堿灘組(T_3b)沉積階段和下侏羅統(tǒng)八道灣組至中侏羅統(tǒng)西山窯組(J_1b-J_2x)沉積階段均具有從北東向南西方向的前展式遷移特征,說明當(dāng)時的構(gòu)造動力是從北東方向發(fā)起的。在斷裂走向上生長指數(shù)的變化規(guī)律既與斷裂構(gòu)造的不同歸屬有關(guān),又與不同方向斷裂之間的距離有關(guān)�？_依斷裂的生長指數(shù)沿走向表現(xiàn)出更大的變化特點(diǎn),這與其他方向斷裂構(gòu)造的疊加所造成的活動性增強(qiáng)有關(guān)。
[Abstract]:In order to determine the active regularity and controlling factors of the early Mesozoic fault structures in the southeastern Wulungu depression, the axial plane and composition of the fault-spreading folds caused by the synsedimentary reverse faults are determined. The structural growth index of the early Mesozoic faults in the triangular region of the southeastern Wulungu depression, which is held by the Hongyan fault terrace and the Luliang uplift, is analyzed. The sedimentary stage of the Upper Triassic Baijiatan formation is T ~ 3b). The growth index of Wudong fault is about 1.5, the red basin fault is less than 1.3, and the Karasayi fault is less than 1.2. In the depositional stage of the lower Jurassic Badaowan formation to the Xishanyao formation of the Middle Jurassic Xishanyao formation, the Wudong fault has the largest growth index during the lower Jurassic Badaowan formation J1b) sedimentary period. The red basin fault has the largest growth index during the deposition period of the Sangonghe formation of the Middle Jurassic. The Karasayi fault has the largest growth index during the deposition period of the Xishanyao formation of the Middle Jurassic and the strike direction of the fault. The red basin and Karasayi faults have a smaller growth index of the southernmost eastern end (or the eastern end) and are close to 1, then the growth index increases gradually in the north west (or west) direction. Then it decreases to the law of growth index equal to 1. Wudong fault in southeastern Wulungu depression. Red basin fault and Karasayi fault in the Upper Triassic Baiyatan formation (T3b) sedimentary stage and the Lower Jurassic Badaowan formation to the Middle Jurassic Xishanyao formation J1b-J2x). The sedimentary stage has the characteristics of pre-spreading migration from NNE to NW. It shows that the tectonic dynamics at that time were initiated from the north to east direction. The variation of the growth index on the fault strike is related to the different attribution of the fault structure. It is also related to the distance between the faults in different directions. The growth index of the Karasayi fault shows a greater variation along the strike, which is related to the increase of activity caused by the stacking of the faults in other directions.
【作者單位】： 河南理工大學(xué)資源環(huán)境學(xué)院;中原經(jīng)濟(jì)區(qū)煤層(頁巖)氣河南省協(xié)同創(chuàng)新中心;
【基金】：全國油氣資源戰(zhàn)略選區(qū)調(diào)查與評價項(xiàng)目(1211302108023-2)
【分類號】：P542.3
【正文快照】： *0引言烏倫古坳陷是準(zhǔn)噶爾盆地東北部的一個一級構(gòu)造單元,沉積有巨厚的上三疊統(tǒng)以來的中生界沉積蓋層,暗示了影響烏倫古坳陷沉積和構(gòu)造演化的主要斷裂在中生代具有重要的活動性。揭示這些斷裂的活動規(guī)律和控制因素不僅對于烏倫古坳陷的油氣勘探,而且對整個準(zhǔn)噶爾盆地的石油地

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