APPLICATION OF SEISMIC ATTRIBUTE ANALYSIS TO THE PERMIAN-TRIASSIC DEPOSITS IN THE SOUTH YELLOW SEA
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摘要: 以往对南黄海盆地沉积相分析主要根据地震剖面的振幅、相位和频率进行地震相划分,再结合测井资料得到沉积相分布,而地震属性除了以上3种属性外,还包含着多种与沉积相有关的属性,以往对沉积相的分析未能充分利用这些地震属性信息。目前,南黄海盆地钻井资料较少,充分利用地震多属性信息对南黄海盆地三叠系下统青龙组-二叠系上统龙潭组、大隆组进行沉积相分析,进而预测有利储层。研究认为,对南黄海盆地岩性比较敏感的地震属性包括弧长、平均能量、能量半衰时、相关长度、平均信噪比和目的层厚度。其中弧长能够揭示砂泥的分布,平均能量能够反映当时水体能量或者沉积能量的高低,能量半衰时表征相带分布的连续性,相关长度和平均信噪比则反映了地层横向连续性和资料的品质,目的层厚度反映目的层残留的厚度。通过以上地震属性的分析,认为三叠系下统青龙组地层的台地相鲕粒灰岩为有利储集层;上二叠系龙潭组、大隆组的三角洲相为有利储集层,河流相为较有利储集层。Abstract: Sedimentary facies analysis in the South Yellow Sea Basin was made in this paper based on seismic amplitude, phase and frequency, plus logging data. The old procedure did not take the full advantage of seismic attributes, although seismic attributes contain a lot of information of sedimentary facies. There are little well data existing in the South Yellow Sea Basin up to date. Therefore, it becomes a necessity to make full use of seismic attributes information for facies analysis of the Lower Triassic Qinglong Formation and the Permian Longtan-Dalong Formations in the South Yellow Sea. Our results show that there occur some relatively sensitive seismic attributes including arc length, average energy, energy half time, correlation length, average SNR and thickness. The arc length is a proxy to indicate the distribution of sand and mud, the average energy reflect the water energy or sediment dynamics at the time of deposition, energy half time is related to the continuity of facie distribution, correlation length and average SNR indicate the lateral continuity and seismic quality, and the thickness reflects the residual thickness of the target layers. Based on the analysis, we concluded that the platform facies of oolitic limestone is the most optimum reservoir in the Lower Triassic Qinglong Formation. The deltaic facies is the most optimum reservoir in the upper Permian Longtan and Dalong Formations, and the fluvial facies is also favorable.
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Key words:
- The South Yellow Sea /
- seismic attribute /
- sedimentary facies /
- optimum reservoir
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