石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (4): 1054-1066.doi: 10.11743/ogg20230420

• 方法技术 • 上一篇    

塔里木盆地巴麦地区石炭系卡拉沙依组年代标尺及地层剥蚀厚度精细计算

张坦(), 姚威, 赵永强, 周雨双, 黄继文, 范昕禹, 罗宇   

  1. 中国石化 石油勘探开发研究院 无锡石油地质研究所,江苏 无锡 214126
  • 收稿日期:2022-12-12 修回日期:2023-03-27 出版日期:2023-08-01 发布日期:2023-08-09
  • 第一作者简介:张坦(1994—),男,工程师,构造与油气成藏。E-mail:zhangtan.syky@sinopec.com
  • 基金项目:
    中国石化科技部科技攻关项目(P21049-2)

Time scale and denudation thickness calculation of Carboniferous Kalashayi Formation in the Bamai area, Tarim Basin

Tan ZHANG(), Wei YAO, Yongqiang ZHAO, Yushuang ZHOU, Jiwen HUANG, Xinyu FAN, Yu LUO   

  1. Wuxi Brach,Petroleum Exploration and Production Research Institute,SINOPEC,Wuxi,Jiangsu 214126,China
  • Received:2022-12-12 Revised:2023-03-27 Online:2023-08-01 Published:2023-08-09

摘要:

古地貌的精确恢复对于寻找优质储层及烃源岩优势相带起着十分重要的作用,而剥蚀厚度计算又是古地貌恢复研究中的核心步骤。基于自然伽马曲线数据,利用频谱分析、连续小波变换和经验模态分解等技术手段,建立了塔里木盆地巴麦地区石炭系卡拉沙依组具有相对时间概念的“浮动”天文年代标尺和高精度的地层层序格架,并进一步精确计算了石炭系卡拉沙依组剥蚀厚度。结果显示:①巴麦地区石炭系卡拉沙依组沉积时受天文轨道周期的控制,保存有完整的米兰科维奇旋回;②经验模态分解方法得出的固有模态分量imf3与长偏心率(e1)控制下的地层旋回个数基本一致,据此建立了研究区具有相对时间概念的“浮动”天文年代标尺和高精度的地层层序格架;③基于经验模态分解方法计算的结果,结合不同地区钻井缺失旋回数量和平均旋回厚度之间的关系,精确计算了研究区内石炭系卡拉沙依组剥蚀厚度;④研究区内石炭系卡拉沙依组剥蚀厚度在0 ~ 390 m,剥蚀强度整体表现为“西强东弱”的特征,中部BT5井附近斜坡区域,易形成良好的储集体,是下一步有利的勘探区域。研究提出的思路和方法为类似地区高频地层层序格架的构建、“浮动”天文年代标尺的建立及地层剥蚀厚度的精细计算等提供了参考。

关键词: 连续小波变换, 频谱分析, 米兰科维奇旋回, “浮动”天文年代标尺, 层序地层, 卡拉沙依组, 巴麦地区, 塔里木盆地

Abstract:

Restoration of paleogeomorphology plays a very important role in guiding the search for high-quality reservoirs and dominant source rocks of oil and gas, during which the calculation of denudation thickness is the vital step. In this study, the abundant GR curves together with the main frequency and astronomical time scale of the Carboniferous Kalashayi Formation in the Bamai area, Tarim Basin, were used to establish the “floating” astronomical chronological scale with relative time concept and high-precision stratigraphic sequence frame using spectral analysis, wavelet transform and EMD. The results show that a complete Milankovich cycle presents in the formation as a result of astronomical orbit control during the deposition of the formation; and the astronomical chronological scale and the stratigraphic sequence frame is based on the understanding that the imf3 component calculated by EMD method is basically consistent with the number of stratigraphic cycles under the control of e1. Based on the results of EMD method, the relationship between the number of missing cycles and the average cycle thickness revealed by drilling in different regions was used to accurately calculate the denudation thickness of the Carboniferous Kalashayi Formation. The erosion thickness of the Kalashayi Formation of the Carboniferous in the study area varies between 0 and 390 m with the overall denudation characterized by “intensive in the west and mild in the east”. The slope area near the BT5 well in the middle of the study area is suggested to be a potential exploration target for oil and gas. The ideas and methods proposed provide a reference for the construction of high-frequency stratigraphic sequence framework, the establishment of “floating” astronomical chronological scales, and the precise calculation of formation erosion thickness in not only the study area, but also areas with similar geological settings.

Key words: continuous wavelet transform, spectral analysis, Milankovitch cycle, "floating" astronomical time scale, sequence stratigraphic, Kalashayi Formation, Baimai area, Tarim Basin

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