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| The application of wide field electromagnetic method to the oil and gas exploration of Niuyingzi sag in Liaoxi area |
| Qiu-Shi SUN1, Jie YUAN2, Wen-Ming ZONG1, Shou-Liang SUN1, Xiao-Yong GAO1, Heng ZHU1, Tao ZHANG1, Nan JU1 |
1. Shenyang Center of Geological Survey, CGS, Shenyang 110034, China
2. No. 814 Geological Party, East China Geological Exploration Bureau of Jiangsu Nonferrous Metals, Nanjing 210007, China |
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Abstract The authors applied the wide field electromagnetic method to conducting work in Mesoproterozoic carbonatite nappe area and achieved good result. It is for the first time that Beipiao source formation was discovered below the carbonatite nappe, which was further proved by well cores. It shows low resistance in comparison with things of its adjacent layers. The actual electronic resistance of underground electric body was also obtained. These discoveries have enriched the exploration strata of the east Yanliao subsiding belt and expanded one Mesoproterozoic exploration stratum to two exploration strata, i.e., the Mesoproterozoic black carbonate stratum and mudstone stratum.
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Received: 25 June 2018
Published: 20 February 2019
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Geological sketch of Niuyingzi depression
1—line position;2—normal fault;3—reverse fault;4—thrust fault;5—intrusive rock;6—Quaternary;7—Cretaceous Yixian formation;8—Jurassic Tiaojishan formation;9—Jurassic Dengzhangzi formation;10—Jurassic Haifanggou formation;11—Permian Shihezi formation;12—Cambrian-Ordovician strata;13—Mesoproic-Neoproterozoic strata
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| 地-电分层 | 代号 | 主要岩性 | 标本数 | 电阻率范围/(Ω·m) | 电性特征 | | 侏罗系土城子组 | J3t | 粉砂岩、含砾粉砂岩 | 37 | 102~172 | 低阻 | | 侏罗系髫髻山组 | J2t | 安山岩、角砾熔岩 | 62 | 562~846 | 次低阻 | | 侏罗系海房沟组 | J2h | 复成分砾岩、砂岩、页岩夹煤线 | 32 | 163~220 | 低阻 | | 侏罗系北票组 | J1b | 泥岩、砂岩夹煤线 | 27 | 110~130 | 低阻 | | 奥陶系 | O | 灰岩、白云岩 | 29 | 5100~9150 | 高阻 | | 寒武系 | ∈ | 泥晶灰岩 | 24 | 2073~6304 | 次高阻 | | 青白口系 | Qb | 灰岩、白云岩 | 50 | 6367~13497 | 高阻 | | 洪水庄组 | Jxh | 粉砂质泥岩、钙质页岩 | 32 | 192~231 | 低阻 | | 长城系—蓟县系雾迷山组 | Ch-Jxw | 白云岩、灰岩、砂岩 | 185 | 1496~9672 | 次高阻 | | 太古宇 | Ar | 斜长角闪岩、变粒岩、片麻岩 | 67 | 3208~3906 | 次高阻层 | | 岩体 | γ | 花岗岩 | 65 | 5226 | 次高阻体 |
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The wide filed apparent resistivity curve comparison(a) and the abnormal amplitude (b)
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The apparent resistivity inversion profile of wide fieldelectromagnetic sounding of L1 line in Niuyingzi depression
1—thrust fault;2—stratigraphic boundary;3—granitic pluton;4—Changchengian;5—Jixianian;6—Jixianian Gaoyuzhuang formation;7—Jixianian Yangzhuang formation;8—Jixianian Wumishan formation;9—Cambrian;10—Ordovician;11—Jurassic Beipiao formation;12—Jurassic Haifanggou formation
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The apparent resistivity inversion profile of wide fieldelectromagnetic sounding of L2 line in Niuyingzi depression
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The stratigraphic section of LLD1 well
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