准噶尔盆地滴西地区二叠系梧桐沟组一段储层砂体及沉积相特征—基于地震正演模拟的启示[1]
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1.中国石油新疆油田分公司开发事业部;2.中国石油新疆油田分公司采气一厂

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P624

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中国石油天然气集团公司新疆重大科技专项(2017E-0410)


Characteristics of reservoir sand bodies and sedimentary facies in the first member of Permian Wutonggou Formation in Dixi area of Junggar Basin: Inspiration from seismic forward modeling
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Exploitation Enterprise Part of Xinjiang Oilfield Company, CNPC

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    摘要:

    准噶尔盆地滴西地区二叠系梧桐沟组油气勘探潜力巨大。基于最新地震资料,综合薄片资料、钻测井资料和岩石物性、物理参数,利用地震正演模拟、波阻抗属性和波形聚类属性,表征了储层基本特征、厘清了梧桐沟组一段上、下砂组地震波形识别方法、刻画了上、下砂组砂体厚度分布规律、明确了上、下砂组沉积相发育特征。结果显示:梧桐沟组砂岩以岩屑砂岩和长石岩屑砂岩为主,属低孔低渗储层。砂体地震波形特征受地震分辨率、砂体厚度、泥岩夹层厚度、砂体叠置关系和下伏岩性影响显著。基于正演模型砂体波形特征解释的砂体展布规律与平均波阻抗属性分布规律吻合度高。研究区发育三角洲前缘水下分流河道微相、河口坝微相、水下支流间湾微相和席状砂微相,上、下砂组沉积相发育特征存在较大差异。

    Abstract:

    The Permian Wutonggou Formation in Dixi area of Junggar Basin has huge potential for oil and gas exploration. Based on the latest seismic data, combined with thin section data, drilling and logging data, rock physical properties and physical parameters, using seismic forward modeling, wave impedance attributes and waveform clustering attributes, the basic characteristics of the reservoir are characterized, the seismic waveform identification method of the upper and lower sand groups in the first member of Wutonggou Formation is clarified, the thickness distribution law of the upper and lower sand groups is described, and the sedimentary facies development characteristics of the upper and lower sand groups are clarified. The results display that the sandstone of Wutonggou Formation is mainly lithic sandstone and feldspar lithic sandstone, which belongs to low porosity and low permeability reservoir. The seismic waveform characteristics of sand bodies are significantly affected by seismic resolution, sand body thickness, mudstone interlayer thickness, sand body superposition relationship and underlying lithology. The sand body distribution regular pattern based on the interpretation of the sand body waveform characteristics of the forward model is highly consistent with the average wave impedance attribute distribution regular pattern. The study area develops delta front underwater distributary channel microfacies, estuary dam microfacies, underwater tributary bay microfacies and sheet sand microfacies. There are great differences in the development characteristics of sedimentary facies between the upper and lower sand groups.

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邱恩波,丁艳雪,石新朴,等. 准噶尔盆地滴西地区二叠系梧桐沟组一段储层砂体及沉积相特征—基于地震正演模拟的启示[1][J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-27
  • 最后修改日期:2024-06-06
  • 录用日期:2024-06-08
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