Distinguishing methods for coal beds in Yacheng Formation of Qiongdongnan Basin

doi:10.7623/syxb201004011

Editorial office of ACTA PETROLEI SINICA ›› 2010, Vol. 31 ›› Issue (4): 586-590.DOI: 10.7623/syxb201004011

• Petroleum Exploration • Previous Articles Next Articles

Distinguishing methods for coal beds in Yacheng Formation of Qiongdongnan Basin

SHEN Huailei 1 QIN Changwen 1 WANG Dongdong 2 ZHANG Feng 3

Received:2010-01-05 Revised:2010-02-25 Online:2010-07-25 Published:2010-09-25

琼东南盆地崖城组煤层的识别方法

沈怀磊 1 秦长文 1 王东东 2 张峰 3

1中海油研究总院北京 100027； 2中国矿业大学地球科学与测绘工程学院北京 100083； 3中煤航测遥感局遥感应用研究院陕西西安 710054

通讯作者: 沈怀磊
作者简介:沈怀磊，男，1980年6月生，2007年获中国石油大学（北京）硕士学位，现为中海油研究总院勘探研究院工程师，主要从事地球物理解释及沉积研究工作。
基金资助:
国家重点基础研究发展规划（973）项目(2009CB219400)，国家自然科学基金项目（No.40872100），国土资源部全国油气资源战略选区调查与评价项目（XQ-2004-05）、(XQ-2007-05)和国家科技重大专项(2008ZX05025)联合资助。

Abstract

Abstract:

Based on the analysis of log responses to coal bed comprehensively and the extraction of log information profoundly, three method for distinguishing coal beds were proposed, including the logical decision, cluster analysis and electrofacies cobweb method. The logical decision method can be used to distinguish coal beds in the non-cored hole on the basis of the logging characteristics of coal bed showing in cores. The cluster analysis method implies that the principal components of logging curves are analyzed firstly to find out several logging traces that have great contributions for distinguishing coal beds (the cumulative contribution rate should be over 85%). Then these logging traces are analyzed by the cluster analysis method. The coal beds in the non-cored hole can be distinguished, according to the property of coal bed showing in cores. The electrofacies cobweb method is based on the log parameters of different lithologic strata on a cobweb figure and respectively build the standard cobweb figures for different lithologic strata. Then, the cobweb figures of the standard lithologic strata are compared with the cobweb figures of the suspected coal beds to distinguish the real coal beds. The credibility of the distinguished coal beds can be semi-quantitatively analyzed. The comparison of the half-amplitude thickness and 1/3 amplitude thickness of logging trace with the true thickness of coal bed shows that the 1/3 amplitude thickness of logging trace is proximal with the true thickness of coal bed and can be regarded as thickness of the distinguished coal bed.

Key words: Qiongdongnan Basin, Yacheng Formation, coal bed distinguishing method, log response, semi-quantitative analysis

摘要：

在综合分析煤层测井响应和提取测井资料深层次信息的基础上，给出了3种识别煤层的方法，即逻辑判别法、聚类分析法和测井相蜘蛛网图法。逻辑判别法是根据岩心揭示煤层的测井特征来识别未取心段中的煤层；聚类分析法是对多种测井曲线进行主成分分析，找出对煤层识别贡献最大的几条测井曲线（累积贡献率>85%），再对这些曲线进行聚类分析，依据取心段煤层的特征识别未取心段的煤层；测井相蜘蛛网图法是将剖面中（特别是取心段）不同岩性地层的不同测井参数分别展现在一张蜘蛛网图上，即建立不同岩性的标准测井相蜘蛛网图，再用这些标准的蜘蛛网图与疑似煤层蜘蛛网图相比较，以识别真正的煤层，并对识别出的煤层的可信程度进行半定量化综合分析。在充分分析了测井曲线半幅值厚度和1/3幅值厚度与实测煤层厚度的关系后，认为1/3幅值与实测煤层厚度最为相近，而将其作为解释煤层的厚度。

关键词: 琼东南盆地, 崖城组, 煤层识别方法, 测井响应, 半定量分析

SHEN Huailei QIN Changwen WANG Dongdong ZHANG Feng. Distinguishing methods for coal beds in Yacheng Formation of Qiongdongnan Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2010, 31(4): 586-590.

沈怀磊秦长文王东东张峰. 琼东南盆地崖城组煤层的识别方法[J]. 石油学报, 2010, 31(4): 586-590.

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Distinguishing methods for coal beds in Yacheng Formation of Qiongdongnan Basin

琼东南盆地崖城组煤层的识别方法

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