Multifractal properties of oil and gas indices in Songnan Low Uplift of Qiongdongnan Basin deepwater area

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2022-05-06 DOI:10.1144/geochem2021-092

Yan Zhang, Li Zhang, Jie Zhou, Jitian Zhu, Lishan Tang, Yongzhang Zhou

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Abstract

In recent years, a high-quality reservoir was discovered in the Songnan Low Uplift in the eastern deepwater area of the Qiongdongnan Basin, northern South China Sea. To clarify that this area has good exploration prospects, this paper uses the multifractal moment method to analyze 2689 data points acquired from the basin in the southeast of the southern low bulge. It is pointed out that the fractal behaviors of different types of geochemical indices are often distinguished by multifractal spectra of different shapes, therefore, multifractal spectrum function analysis is used in this paper. These data were considered within the context of 13 oil and gas indices describing the multifractal spectrum function morphological characteristics. The results show that these indices can be divided into three types according to the multifractal spectrum. Indices with a strong multifractal spectrum function in the Songnan Low Uplift have the characteristics of a wide and continuous multifractal spectrum function, forming a right-skewed arc shape, while the other indices show weak or single fractal characteristics. The results are in good agreement with principle component analysis results, where the spectral function of each principal component shows that the gas source of the C1, C2, C3, nC4, nC5, and heavy hydrocarbons indices in the Songnan Low Bulge has multifractal characteristics. The weight of these indices with strong multifractal characteristics shows that the principle components C1, C2, and C3, and heavy hydrocarbons are important indices for delineating hydrocarbon prospects in the Songnan Low Uplift. Multifractal and spatial analysis techniques provide new ideas for index selection and comprehensive information extraction for oil and gas exploration.Thematic collection: This article is part of the Applications of Innovations in Geochemical Data Analysis collection available at: https://www.lyellcollection.org/cc/applications-of-innovations-in-geochemical-data-analysis

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琼东南盆地深水区松南低隆起油气指数的多重分形特征

近年来，在琼东南盆地东部深水区的松南低隆起发现了一个优质储层。为了阐明该区具有良好的勘探前景，本文采用多重分形矩方法对南部低凸起东南部盆地2689个数据点进行了分析。指出不同类型地球化学指标的分形行为往往通过不同形状的多重分形谱来区分，因此本文采用了多重分形谱函数分析方法。这些数据是在描述多重分形谱函数形态特征的13个油气指数的背景下考虑的。结果表明，根据多重分形谱，这些指标可分为三类。松南低隆起具有强多重分形谱函数的指数具有宽而连续的多重分形谱功能，形成右斜弧形，而其他指数则表现出弱或单一的分形特征。结果与主成分分析结果吻合较好，各主成分的谱函数表明，松南低凸起C1、C2、C3、nC4、nC5和重烃指数的气源具有多重分形特征。这些具有强多重分形特征的指标的权重表明，C1、C2、C3主成分和重烃是刻画松南低隆起油气远景的重要指标。多重分形和空间分析技术为油气勘探指标选择和综合信息提取提供了新的思路。专题汇编：本文是地球化学数据分析创新应用汇编的一部分，可在以下网站获取：https://www.lyellcollection.org/cc/applications-of-innovations-in-geochemical-data-analysis

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来源期刊

Geochemistry-Exploration Environment Analysis 地学-地球化学与地球物理

CiteScore

3.60

自引率

16.70%

发文量

审稿时长

1 months

期刊介绍： Geochemistry: Exploration, Environment, Analysis (GEEA) is a co-owned journal of the Geological Society of London and the Association of Applied Geochemists (AAG). GEEA focuses on mineral exploration using geochemistry; related fields also covered include geoanalysis, the development of methods and techniques used to analyse geochemical materials such as rocks, soils, sediments, waters and vegetation, and environmental issues associated with mining and source apportionment. GEEA is well-known for its thematic sets on hot topics and regularly publishes papers from the biennial International Applied Geochemistry Symposium (IAGS). Papers that seek to integrate geological, geochemical and geophysical methods of exploration are particularly welcome, as are those that concern geochemical mapping and those that comprise case histories. Given the many links between exploration and environmental geochemistry, the journal encourages the exchange of concepts and data; in particular, to differentiate various sources of elements. GEEA publishes research articles; discussion papers; book reviews; editorial content and thematic sets.