Geophysical identification and distribution of Upper Paleozoic coals in southeastern Ordos Basin

WU Jiang; GUAN Yunwen; PU Renhai; GAO Xiaoping

doi:10.16152/j.cnki.xdxbzr.2023-05-015

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Geophysical identification and distribution of Upper Paleozoic coals in southeastern Ordos Basin

更新时间：2023-10-30

- Geophysical identification and distribution of Upper Paleozoic coals in southeastern Ordos Basin
- Journal of Northwest University (Natural Science Edition) Vol. 53, Issue 5, Pages: 830-842(2023)
- 作者机构：
  
  1.中国石化石油勘探开发研究院，北京　100083
  2.西北大学　地质学系/大陆动力学国家重点实验室，陕西　西安，710069
  3.延长石油集团油气勘探公司，陕西　延安，716000
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2023-05-015
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WU Jiang, GUAN Yunwen, PU Renhai, et al. Geophysical identification and distribution of Upper Paleozoic coals in southeastern Ordos Basin. [J]. Journal of Northwest University (Natural Science Edition) 53(5):830-842(2023)
DOI：

WU Jiang, GUAN Yunwen, PU Renhai, et al. Geophysical identification and distribution of Upper Paleozoic coals in southeastern Ordos Basin. [J]. Journal of Northwest University (Natural Science Edition) 53(5):830-842(2023) DOI： 10.16152/j.cnki.xdxbzr.2023-05-015.

摘要

根据岩心、测井、地震资料综合分析鄂尔多斯盆地东南部煤层识别方法、厚度变化及其与古地貌和沉积相关系。研究发现，该区在山西组下段和本溪－太原组发育两套较厚煤层，它们具有低自然伽马、低密度、高电阻率和高时差测井特征，在地震剖面上形成半个周期的上谷下峰特强振幅反射。两套煤层累计厚度1～10 m，平均累厚2.4 m，单层煤最厚5.5 m。单层厚度大于2 m的煤层面积约2 500 km,2,，煤层埋深一般2 500～3 000 m。研究认为，本溪－太原组厚煤层主要分布在近源的、具有下切成因的奥陶系古岩溶凹地，而无下切的、远源的奥陶系古岩溶凹地为同时代或近时代的灰岩沉积；上古生界的煤层与分流河道砂岩在平面上的分布具互补关系。

Abstract

Based on core, logging, and seismic data, a comprehensive analysis was conducted on the identification methods of coal seams, thickness changes, and their relationship with paleogeomorphology and sedimentary facies in the southeastern part of the Ordos Basin. The lower part of Shanxi Fm and the upper part of Taiyuan Fm in the southeastern part of the basin characterize low natural gamma ray, low density, high resistivity and high sonic logging values. As the coal velocity is very low and alternates with high-velocity Taiyuan Fm and Ordovician limestones, the two sets of coalsbelow and above Taiyuan limestonesform an extremely-strong amplitude reflection on the seismic profile. The two sets of coals are 1～10 m thick cumulatively, average 2.4 m, with 4 m as the maximum induvial thickness. The coal seam with an individual layer thicker than 2 m covers an area of about 2 500 km,2, and the buried depth of the coal seam range from 2 500 to 3 000 m. Research has shown that the thick coal seams of Taiyuan Fm are mainly distributed proximally in the Ordovician paleokarst depression with incised origin, while the Ordovician paleokarst depression without incised origin was deposited by distal coeval limestone rocks. There is a complementary relationship between the coal seams and the thickening zone of distributary channel sandstone for the Shanxi Fm.

关键词

煤层分布测井与地震响应古地貌沉积相

Keywords

coal distributioncoal logging and seismic responsepalaetopographysedimentary facies

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