| 复杂构造区油气构造保存条件分析:来自皖泾地1井的构造解析 |
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| 引用本文： | 谭元隆,王宗秀,冯兴强,肖伟峰,季长军,吴林,周磊,张林炎.复杂构造区油气构造保存条件分析:来自皖泾地1井的构造解析[J].地质力学学报,2021,27(3):441-452. |
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| 作者姓名： | 谭元隆 王宗秀 冯兴强 肖伟峰 季长军 吴林 周磊 张林炎 |
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| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081;自然资源部古地磁与古构造重建重点实验室, 北京 100081;中国地质调查局油气地质力学重点实验室, 北京 100081 |
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| 基金项目： | 中国地质调查局地质调查项目（DD20190085） |
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| 摘 要： | 下扬子地区中生代发生了多期挤压-伸展构造作用，是制约该区域油气勘探取得突破的重要因素之一。为揭示下扬子区中生代构造作用对油气保存的影响，文章通过地震剖面解释资料、野外露头调查、区域构造演化历史分析，并结合皖泾地1井获取的岩芯资料和油气显示情况综合探讨了下扬子南部地区的有利构造保存条件。地震解释剖面和地表调查结果表明下扬子南部地区晚三叠世以来主要经历了两期重要的构造作用:第一期为印支期挤压作用造成褶皱变形和逆冲断层以及隆升剥蚀；第二期为晚白垩世以来的伸展作用，形成断陷盆地和正断层活动。皖泾地1井在二叠系页岩地层中获得页岩气显示，在下三叠统殷坑组灰岩中钻遇轻质油，表明下扬子南部区域具有良好的油气富集条件和资源潜力。构造保存条件分析表明皖泾地1井位于褶皱冲断带内的向斜部位，印支期隆升剥蚀量小，晚白垩世以来伸展拉张幅度小，具有良好的封闭性和成藏条件，是有利的构造保存部位。
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| 关 键 词： | 复杂构造区 构造解析 皖泾地1井 保存条件 |
| 收稿时间： | 2020/9/24 0:00:00 |
| 修稿时间： | 2021/1/3 0:00:00 |
Structural preservation conditions analysis of oil and gas in complex structural area: A case study of structural analysis in the Well Wanjingdi-1, Anhui, China |
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| TAN Yuanlong,WANG Zongxiu,FENG Xingqiang,XIAO Weifeng,JI Changjun,WU Lin,ZHOU Lei,ZHANG Linyan.Structural preservation conditions analysis of oil and gas in complex structural area: A case study of structural analysis in the Well Wanjingdi-1, Anhui, China[J].Journal of Geomechanics,2021,27(3):441-452. |
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| Authors: | TAN Yuanlong WANG Zongxiu FENG Xingqiang XIAO Weifeng JI Changjun WU Lin ZHOU Lei ZHANG Linyan |
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| Institution: | 1.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China2.Key Laboratory of Paleomagnetism and Paleotectonic Reconstruction, Ministry of Natural resources, Beijing 100081, China3.Key Laboratory of Petroleum Geomechanics, China Geological Survey, Beijing 100081, China |
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| Abstract: | The multi-stage tectonism of compression and extension occurred in the southern part of the Lower Yangtze region in the Mesozoic, which is one of the important factors restricting the breakthrough of oil and gas exploration in this area. This paper aims to reveal the influence of Mesozoic tectonisim on oil and gas preservation in the Lower Yangtze area. Based on the seismic profile interpretation data, field outcrop survey, regional tectonic evolution history analysis and the drilling core data and oil-gas display of the Well Wanjingdi-1, we comprehensively discussed the favorable structural preservation conditions in the southern part of the Lower Yangtze region. The results of seismic interpretation profile and surface survey show that the southern part of the lower Yangtze River has experienced two important tectonic processes since the Late Triassic. The first stage is fold deformation, thrust fault and uplift erosion caused by Indosinian compression, and the second stage is extension since the Late Cretaceous, resulting in the formation of fault basin and normal fault activity. Shale gas display was obtained from the Permian shale in the Well Wanjingdi-1, and light oil was found in the drilling of the Lower Triassic Yinkeng Formation, indicating that the southern Lower Yangtze region has good enrichment conditions and resource potential, which points out a new direction for oil and gas exploration in the region. The analysis of structural preservation conditions shows that the Well Wanjingdi-1 is located in the syncline of the fold-depression belt. The amount of uplift and denudation was small in the Indosinian period. Since the late Cretaceous, the depression has a small amplitude of extension and has good sealing and reservoir forming conditions. It is a favorable structural position for oil and gas preservation in this region. Based on the comprehensive analysis of regional structure and sedimentary basin evolution, it is considered that in the southern Lower Yangtze region, the syncline structural belt in the southern margin of the basin with small erosion amount of Triassic strata or the central zone of fault basin overlying thick Cretaceous-Cenozoic strata should be taken as the key target to search for favorable oil and gas zones. |
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| Keywords: | complex structural area structural analysis Well Wanjingdi-1 preservation conditions |
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