Seismic response analysis and distribution prediction of source rocks in a survey of the South China Sea

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Interpretation-A Journal of Subsurface Characterization Pub Date : 2023-02-08 DOI:10.1190/int-2022-0072.1
Weihua Jia, Z. Zong, Hongchao Sun, T. Lan
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引用次数: 3

Abstract

Identification and prediction of high-quality source rocks is the key to obtaining new resources in the exploration area of Cenozoic basins in offshore China. We investigate the seismic response and area of hydrocarbon source rocks based on seismic data, well curves, lithologic interpretation, and geochemical analysis. The target is the source rock development zone of the W Formation in a survey of the South China Sea. The results show that the seismic response of thick layer source rocks differ from surrounding rocks in the seismic profile (strong reflections with opposite polarity at the top and bottom and messy or chaotic reflections inside). Seismic reflections of interlayer source rocks have the characteristics of low frequency and continuous strong amplitude. The dominant frequency and maximum amplitude decrease as the number of mudstone layers increases. Through seismic petrophysical analysis, we have obtained three sensitive parameters of source rock in this survey: clay content, P-wave impedance, and elastic impedance. We use different classification methods to realize the classification and prediction of hydrocarbon source rocks, among which the Kernel Fisher Discriminant Analysis (KFDA) method is the best. The prediction results are consistent with the geological background, geochemical information, and well curves.
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南海某海域烃源岩地震反应分析及分布预测
优质烃源岩的识别与预测是中国近海新生代盆地勘探区获得新资源的关键。根据地震资料、井曲线、岩性解释和地球化学分析,研究了烃源岩的地震响应和面积。目标为南海W组烃源岩发育带。结果表明,在地震剖面上,厚层源岩的地震响应与围岩不同(顶部和底部极性相反的强反射,内部杂乱或混乱的反射)。层间烃源岩的地震反射具有低频和连续强振幅的特点。主频和最大振幅随泥岩层数的增加而减小。通过地震岩石物理分析,我们获得了本次勘察的三个敏感源岩参数:粘土含量、P波阻抗和弹性阻抗。我们使用不同的分类方法来实现烃源岩的分类和预测,其中以核Fisher判别分析(KFDA)方法最好。预测结果与地质背景、地球化学信息和井曲线一致。
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来源期刊
CiteScore
2.50
自引率
8.30%
发文量
126
期刊介绍: ***Jointly published by the American Association of Petroleum Geologists (AAPG) and the Society of Exploration Geophysicists (SEG)*** Interpretation is a new, peer-reviewed journal for advancing the practice of subsurface interpretation.
期刊最新文献
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