發(fā)布時間：2018-04-21 05:06

  本文選題：原型盆地 + 邊緣相�。� 參考：《中國海洋大學(xué)》2015年碩士論文

【摘要】：敦煌盆地位于甘肅、新疆與青海的交界處,勘探程度低,制約著盆地內(nèi)油氣資源的勘探開發(fā)。本論文根據(jù)原型盆地分析的基本原則,基于敦煌盆地野外地質(zhì)觀察、航磁異常分析及前人對敦煌盆地及周緣盆地基底特征的研究,厘定民豐-且末斷裂為敦煌盆地的西部邊界、紅柳溝-拉配泉斷裂為敦煌盆地的西南邊界、阿爾金斷裂為敦煌盆地的南部和東部邊界。基于侏羅紀(jì)中國大地構(gòu)造特征結(jié)合前人的深地震資料解釋,研究表明敦煌盆地形成演化不儀受大陸邊緣板塊構(gòu)造運動遠(yuǎn)程效應(yīng)的影響,又受已形成中國大陸構(gòu)造的影響,還受盆地基底與活動帶和地塊之間的大地構(gòu)造位置影響。根據(jù)對盆地內(nèi)二維地震資料解釋,盆地以三危山為界,為南北兩個單斷箕狀凹陷。根據(jù)盆地內(nèi)古氣候、古生物、沉積相、沉積物顏色、湖盆面積、構(gòu)造運動和區(qū)域應(yīng)力場變化的差異,可以將侏羅系劃分為中下侏羅統(tǒng)和上侏羅統(tǒng)兩個構(gòu)造層。結(jié)合盆地露頭剖面邊緣相和物源分析,指出三危山斷裂為控凹邊界、阿爾金斷裂為控盆邊界。根據(jù)地震時深換算,繪制出盆地的殘留地層分布,下侏羅統(tǒng)在各凹陷內(nèi)均有分布,厚度較小,各凹陷殘留地層孤立分布,殘留地層厚度受斷裂影響明顯；中侏羅統(tǒng)沉積范圍加大,殘留地層厚度大,此時五墩凹陷受三危山斷裂控制是敦煌盆地的沉降、沉積中心,且五墩凹陷與灣窯凹陷連通,三危山以南的紅柳溝凹陷與大壩凹陷未連通,其中紅柳溝凹陷內(nèi)的殘留地層受阿爾金斷裂控制明顯；晚侏羅世,敦煌盆地進(jìn)入消亡階段,只有五墩凹陷、紅柳溝凹陷和大壩凹陷有地層分布,各凹陷連通性差,但五墩凹陷一直是盆地的沉積、沉降中心。
[Abstract]:The Dunhuang basin is located at the junction of Gansu, Xinjiang and Qinghai, and its exploration degree is low, which restricts the exploration and development of oil and gas resources in the basin. Based on the basic principles of prototype basin analysis, field geological observation of Dunhuang basin, aeromagnetic anomaly analysis and previous studies on basement characteristics of Dunhuang basin and its peripheral basins, the Minfeng-Qiumo fault is defined as the western boundary of Dunhuang basin. Hongliugou-Lapiquan fault is the southwestern boundary of Dunhuang basin and Altun fault is the southern and eastern boundary of Dunhuang basin. Based on Jurassic geotectonic characteristics of China combined with the interpretation of previous deep seismic data, it is shown that the formation and evolution of Dunhuang basin is not influenced by the remote effect of tectonic movement of continental margin, but also by the formation of continental tectonics in China. It is also affected by the tectonic position between the basement of the basin and the active belt and block. According to the interpretation of the two dimensional seismic data in the basin, the basin is bounded by Sanwei Mountain, which is composed of two single-fault dustpan sag in the north and south. According to the differences of paleoclimate, paleontology, sedimentary facies, sediment color, lake basin area, tectonic movement and regional stress field, the Jurassic can be divided into middle and lower Jurassic and upper Jurassic tectonic layers. Based on the analysis of the marginal facies and provenance of the outcrop section of the basin, it is pointed out that the Sanwei Mountain fault is the boundary of the controlled concave and the Altun fault is the boundary of the control basin. According to the seismic time depth conversion, the residual stratigraphic distribution of the basin is plotted. The lower Jurassic is distributed in each sag, the thickness is relatively small, the residual strata are isolated in each sag, and the thickness of the residual strata is obviously affected by the fault. The middle Jurassic sedimentary range is enlarged, and the thickness of the residual strata is large. At this time, the Wudun depression is controlled by the Sanwei Mountain fault and is the sedimentation center of the Dunhuang basin, and the Wudun sag is connected with the Wanyao sag. The Hongliugou sag south of Sanwei Mountain is not connected with the dam depression, in which the residual strata in Hongliugou sag are obviously controlled by Altun fault. There are stratigraphic distribution in Hongliugou sag and dam sag, and the connectivity of each sag is poor, but Wudun sag is always the sedimentary and subsidence center of the basin.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P534.52;P542

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