ELECTROMAGNETIC DATA APPLICATION IN CARBONIFEROUS EXPLORATION OF EASTERN QAIDAM BASIN
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摘要: 以柴达木盆地东部新采集的电磁资料为中心,同时以钻井、地震资料为约束,结合其他勘探资料、重力资料进行柴东地区石炭系综合研究、联合解释。研究过程中,首先对电磁资料进行了前期的预处理和反演,主要采用了-维Bostick反演、-维连续介质反演、二维共轭梯度反演、二维连续介质反演及最优化电性分层等反演技术;而后通过对电磁资料进行联合解释和综合研究,得出了柴达木盆地东部石炭系厚度图、石炭系埋深图等柴东地区综合研究成果;最后利用上述研究成果预测了柴达木盆地东部石炭系含油气有利区带,并且进-步针对柴达木盆地东部石炭系勘探提出了有意义的结论和建议。Abstract: Carboniferous formation in the eastern Qaidam Basin belongs to a new area and new strata and lack of data on well and seismic, so processing and interpretation of electromagnetic data must be valued. New Electromagnetic data in eastern Qaidam Basin was used as the center, constrained with drilling and seismic data, and combined with other exploration data, gravity data to do comprehensive research and joint interpretation in this area. Firstly the electromagnetic data was pre-processing and inversed, mainly using the one-dimensional Bostick inversion, one-dimensional continuous medium inversion, two-dimensional conjugate gradient inversion, 2D continuous medium inversion and optimization of electric-layered inversion technique. Then the electromagnetic data and other data was comprehensively interpreted and researched, thus get some comprehensive research results such as Carboniferous thickness map, Carboniferous buried-depth map, so as to effectively predict the oil traps in eastern Qaidam Basin. At last, some conclusions and recommendations were advised in the Carboniferous exploration of Eastern Qaidam Basin.
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Key words:
- Qaidam Basin /
- Carboniferous /
- Electromagnetic survey /
- Seismic exploration
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表 1 埃北1井、德参1井等钻井分层数据表
Table 1. Drilling stratification data table of Aibei No.1 drilling, Decan No.1 drilling and Deke No.1 drilling
井号 井深/m 补心海拔/m Q1+2 N23 N22 N21 N1 E3 K J3 C 德参1 4456 2866.71 96 799 1926 2366 3107 3935 4242 4456.73▽ 德科1 3000 2982.57 1160 2550 2880 3000▽ 埃北1 1319 2889.20 328 906 1319▽ 表 2 德页1井地层分层对比数据
Table 2. Stratigraphic stratification correlation data of Deye No.1 drilling
界 系 统 组 段 底界深度/m 新生界 第四系 全新统 七个泉组 Q1+2 更新统 新近系 上新统 狮子沟组 N23 508 下油砂山组 N22 769 下油砂山组 N21 894 古近系 中新统 上干柴沟组 N1 1120 渐新统 下干柴沟组 E3 1210 中生界 白垩系 犬牙沟组 K+J 侏罗系 C 基岩 1306 -
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