QUANTITATIVE ANALYSIS OF TECTONIC CHARACTERISTICS AND EVOLUTION IN THE EASTERN JUNGGAR BASIN
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摘要: 准噶尔盆地东部地区经历了多期次的构造运动,其构造特征和形成演化机制对该地区的油气勘探和开发具有十分重要的指导意义。运用高分辨率的二维、三维地震、测井数据,优选十条地质格架剖面开展精细构造解释,刻画出不同构造单元的地质结构特征,建立了跨各个构造单元的地质解译模型。在精细构造解译的基础上,基于平衡剖面恢复原理,通过Midland Valley的3D MOVE功能模块对10条地质格架剖面进行构造恢复,并对其各地质时期构造缩短量和缩短速率进行定量表征。准噶尔东部地区缩短量及缩短速率统计分析表明,在东西方向上,三叠纪至侏罗纪缩短量(4.60~11.28 km)及缩短速率最大(0.12~0.20 mm/a),这一时期准东地区经历了强烈的东西向挤压构造变形;在南北方向上,二叠纪和新近纪末期缩短量(2.56~8.93 km、0.54~6.90 km)及缩短速率最大(0.05~0.15 mm/a、0.02~0.19 mm/a),这两个时期准东地区经历了强烈的南北向挤压构造变形。Abstract: The eastern Junggar Basin has undergone multiple tectonic movements. Its tectonic characteristics, formation and evolution mechanism are of great guiding value for oil and gas exploration and development in this area. By using high-resolution 2-D and 3-D seismic and well logging data, ten geological framework sections were selected to carry out fine tectonic interpretation, and the geological characteristics of different tectonic units were described, and the geological interpretation model across each tectonic unit was established. On the basis of fine tectonic interpretation and under the guidance of balanced profile restoration, the sections of ten geological frameworks were reconstructed through the 3D MOVE function module of Midland Valley, and the amount and rate of tectonic shortening in each geological period were quantitatively characterized. The results show that in the East-West direction, the shortening amount (4.60~11.28 km) and the shortening rate (0.12~0.20 mm/a) from the Triassic to the Jurassic periods were the largest and the Junggar region experienced intense East-West compressional tectonic deformation during this period. In the North-South direction, the shortening amount (2.56~8.93 km, 0.54~6.90 km) and the shortening rate (0.05~0.15 mm/a, 0.02~0.19 mm/a) at Permian and the end of Neogene periods were the largest and the Jundong region underwent intense North-South compressional tectonic deformation.
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表 1 东西向剖面缩短量及缩短速率数据统计表
Table 1. Statistic dataset of shortening amounts (km) and shortening rates (mm/a) of E-W geological sections
缩短量/km 缩短速率/(mm/a) A-A′ B-B′ C-C′ D-D′ A-A′ B-B′ C-C′ D-D′ P沉积前 — — — — — — — — T沉积前 2.20028 1.86994 2.45878 1.88073 0.04681 0.03979 0.05231 0.04002 J沉积前 4.60112 6.85644 8.60574 7.52291 0.12257 0.13444 0.16874 0.14751 K沉积前 4.25007 6.23312 6.55676 11.28437 0.12682 0.11131 0.11708 0.20151 E沉积前 0.55007 2.49325 0.40980 5.01527 0.00696 0.03156 0.00519 0.06348 N沉积前 — 0.62331 1.22939 1.25382 0.01450 0.02859 0.02916 现今 2.75035 0.62327 0.40980 1.25382 0.04167 0.02710 0.01782 0.05451 表 2 南北向剖面缩短量及缩短速率数据统计表
Table 2. Statistic dataset of shortening amounts (km) and shortening rates (mm/a) of N-S geological sections
缩短量/km 缩短速率/(mm/a) F-F′ G-G′ H-H′ I-I′ J-J′ F-F′ G-G′ H-H′ I-I′ J-J′ P沉积前 — — — — — — — — — — T沉积前 6.58858 8.92584 2.56280 6.63796 6.75319 0.14018 0.14736 0.05453 0.14123 0.14368 J沉积前 1.49740 4.43114 1.64751 2.80837 2.43115 0.02936 0.12610 0.03230 0.05507 0.04767 K沉积前 1.49740 2.47352 1.09834 0.76592 1.89089 0.02674 0.04417 0.01961 0.01368 0.03377 E沉积前 1.19792 0.98941 0.91529 0.51061 0.54026 0.01516 0.01252 0.01159 0.00646 0.00684 N沉积前 3.09169 2.49470 — 0.25531 0.27013 0.08143 0.01150 — 0.00594 0.00628 现今 4.39533 6.90465 1.28140 1.78714 0.54026 0.11719 0.18716 0.01942 0.07770 0.02349 -
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