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The application and evaluation of the wide field electromagnetic method in the low resistance coverage area-Exemplified by Zhongmu area of Henan Province |
TIAN Hong-Jun1,2( ), YIN Wen-Bin1,2, LIU Guang-Di1,2, JIANG Yong-Fang1,2, YOU Wen-Bing1,2 |
1.Hunan Geosun High-Tech Co., Ltd., Changsha 410208, China 2.Hunan Deep Earth Resources Electromagnetic Exploration Engineering Technology Research Center,Changsha 410208, China |
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Abstract Based on an analysis and summary of the physical properties of the gas-bearing shale layer in Zhongmu area of Henan Province, the authors used the wide-area electromagnetic exploration technology to detect shale gas in the low-resistance coverage area of the Nanhua Basin, obtained the distribution regularity and characteristics of the stratigraphic resistivity within 5km under the work area, and ascertained the structural distribution of the work area. In addition, the development characteristics of gas-bearing shales were revealed, with the main target layers being the Permian Taiyuan Formation, Shanxi Formation, Upper Shihezi Formation and Lower Shihezi Formation. The results show that, in the low-resistance coverage area, the wide-field electromagnetic method is an effective detection method to obtain the buried depth and distribution range of deep gas-bearing shale in the Nanhua Basin, providing geophysical parameters for the evaluation of favorable zones in the later period and the optimization of shale gas layers in the block.
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Received: 20 March 2020
Published: 26 October 2020
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层号 | 顶深/m | 底深/m | 层厚/m | 有效厚度/m | RLLD/(Ω·m) | RLLS/(Ω·m) | MFSL/(Ω·m) | 第四系 | 0 | 197.8 | 197.8 | 197.8 | | | | 明化镇组 | 197.8 | 873 | 675.2 | 675.2 | | | | 馆陶组 | 873 | 1482.8 | 609.8 | 609.8 | 5.556 | 3.797 | 2.812 | 和尚沟组(刘家沟) | 1482.8 | 1893.3 | 410.5 | 410.5 | 91.44 | 84.863 | 62.046 | 孙家沟组 | 1893.3 | 2071.1 | 177.8 | 177.8 | 52.055 | 49.394 | 34.502 | 平顶山组 | 2071.1 | 2174.1 | 103 | 103 | 214.114 | 202.666 | 50.647 | 上石盒子组 | 2174.1 | 2495.2 | 321.1 | 321.1 | 24.398 | 23.361 | 10.704 | 下石盒子组 | 2495.2 | 2798.4 | 303.2 | 303.2 | 17.75 | 16.74 | 8.407 | 山西组 | 2798.4 | 2889.8 | 91.4 | 91.4 | 49.443 | 45.289 | 21.062 | 太原组 | 2889.8 | 2971.8 | 82 | 82 | 646.303 | 301.79 | 21.097 | 本溪组 | 2971.8 | 2987.8 | 16 | 16 | 2381.969 | 2137.384 | 193.5 | 马家沟组 | 2987.8 | 3020.8 | 33 | 33 | 183.625 | 170.723 | |
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Stratigraphic table of the electrical characteristics of Mou 1 well
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Forward curve and abnormal percentage curve of wide field electromagnetic method a— comparison of apparent resistivity curves; b— percentage of exceptions
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Layout of widefield electromagnetic survey line a—field construction schematic diagram of wide-area electromagnetic method; b—line deployment chart
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Line55.4 comprehensive achievement profile a—quasi seismic section; b—inversion results and geological interpretation profile
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Line54 comprehensive achievement profile a—quasi seismic section; b—inversion results and geological interpretation profile
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