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论鄂尔多斯盆地陕北盐洼镇钾1井奥陶系马四段的重复
投稿时间:2016-10-28  修订日期:2018-11-05  点此下载全文
引用本文:马占荣,包洪平,黄建松,杨帆.2019.论鄂尔多斯盆地陕北盐洼镇钾1井奥陶系马四段的重复[J].地质论评,65(1):29-39,[DOI]:.
MA Zhanrong,BAO Hongping,HUANG Jiansong,YANG Fan.2019.Discussing on the Duplication of O m in the Well Zhenjia-1 Northern Shaanxi Salt Depression,Ordos Basin[J].Geological Review,65(1):29-39.
DOI:10.16509/j.georeview.2019.01.003
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作者单位E-mail
马占荣 1)中国石油长庆油田分公司勘探开发研究院西安7100182)低渗透油气田勘探开发国家工程实验室西安710018 mazr_cq@petrochina.com.cn 
包洪平 1)中国石油长庆油田分公司勘探开发研究院西安7100182)低渗透油气田勘探开发国家工程实验室西安710018  
黄建松 1)中国石油长庆油田分公司勘探开发研究院西安7100182)低渗透油气田勘探开发国家工程实验室西安710018  
杨帆 1)中国石油长庆油田分公司勘探开发研究院西安7100182)低渗透油气田勘探开发国家工程实验室西安710018  
基金项目:本文为中国地质调查局地质调查工作项目“陕北奥陶纪盐盆地钾盐资源调查评价”(编号:1212011085516)、“十三五”国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05004 006)的成果。
中文摘要:陕北奥陶纪盐洼区钻探的镇钾1井“马五6盐层段”(奥陶系马家沟组五段6分段)出现了异常的岩性组合序列,盐岩厚度大幅度减薄,代之以厚度100 m以上的纯碳酸盐岩地层,这一变化单从沉积学角度无法解释。为了弄清该井异常岩性段的层位归属,开展了岩性组合、测井旋回、碳氧同位素对比和地震剖面多种资料的综合分析。纵向地层岩性、测井旋回特征、碳氧同位素对比分析表明,这套地层是构造复杂化了的异常地层序列,并非原地沉积,厚度超过100 m的碳酸盐岩地层实为马四段(马家沟组四段),与下伏原地正常沉积的马四段重复。地震剖面显示马四段重复可能与塑性盐岩卷入复杂化了的逆断层有关。因此,镇钾1井钻前预测的“马五6盐层段”实际上是以马四段为主的逆冲断片,该井地层存在重复。镇钾1井马四段重复的确认,有助于正确认识陕北盐洼区马五6地层充填序列,推动局部构造—沉积相关研究工作的进一步开展。
中文关键词:鄂尔多斯盆地  地层重复  奥陶系马家沟组四段  马五6盐层(奥陶系马家沟组五段6分段)  碳同位素  氧同位素  钾盐
 
Discussing on the Duplication of O m in the Well Zhenjia-1 Northern Shaanxi Salt Depression,Ordos Basin
NameInstitution
MA Zhanrong1)Research Institute of Exploration and Development, Changqing Oilfield Branch, PetroChina Company Limited, Xi’an, 710018;2)National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, 710018
BAO Hongping1)Research Institute of Exploration and Development, Changqing Oilfield Branch, PetroChina Company Limited, Xi’an, 710018;2)National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, 710018
HUANG Jiansong1)Research Institute of Exploration and Development, Changqing Oilfield Branch, PetroChina Company Limited, Xi’an, 710018;2)National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, 710018
YANG Fan1)Research Institute of Exploration and Development, Changqing Oilfield Branch, PetroChina Company Limited, Xi’an, 710018;2)National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an, 710018
Abstract:Objectives: The lithological association sequence of the predicted O2 m 5 6 salt layer in the Well Zhenjia-1,drilled in the North Shaanxi Ordovician Depression, is abnormal that is because the salt rock thickness reduced greatly and replaced by pure carbonate strata more than 100 m. These changes can not be reasonably explained according to sedimentary principle. The purpose of this paper is to find out the stratigraphic position of the anomalous carbonate sequence and make reasonable explanation. Methods:The comprehensive analysis of lithological association cycle, log cycle, carbon—oxygen isotope correlation and seismic profile is carried out. Results: Evidences from vertical lithologic cycles and logging cycles, as well as the data of stable isotope of carbon and oxygen revealed that the Fourth member of Ordovician Majiagou formation abbreviated as O2 m 4 was duplicated, and those carbonates more than 100 m actually resembled with the underlying autochthonous O 2 m 4 were allochthonous rocks complicated by tectonic. The seismic profile shows that the repetition of the O 2 m 4 may be related to the involvement of the plastic salt rock in the complicated thrust fault. Therefore, the so called "O 2 m 5 6 salt formation" predicted before drilling in the Well Zhenjia-1 is actually a thrust plate dominated by the O 2 m 4, and the formation of this well is duplicated. Conclusions: The so called “O 2 m 5 6 salt formation" of the Well Zhenjia-1 is an anomalous lithological association sequence which is mainly composed of O 2 m 4 as wells as other formations. The confirmation of the repetition of the O 2 m 4 in the Well Zhenjia- 1 contributes to the correct understanding of the filling sequence of the O 2 m 5 6 strata in the salt depression of Ordos basin, and will promote the further research in the respects of local tectonic and sedimentary .
keywords:Ordos basin  stratigraphy duplication  O2 m 4  O2 m 5 6 salt layer  stable isotope of carbon and oxygen  potash
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