韩城区块煤体结构分布规律及射孔优化方法

Distribution law of coal structure and perforation optimization method in Hancheng block

  • 摘要: 韩城区块煤层受多期构造破坏影响,煤体结构复杂,目前对煤体结构分布规律认识不足。为此,利用岩芯资料、测井信息等对煤体结构进行了测井评价识别,并研究了煤体结构分布规律,在此基础上分析了不同煤体结构的压裂效果。结果表明:煤体结构测井响应的敏感因子主要是井径和自然伽马;山西组5号煤层煤体结构以碎粒煤和碎裂煤为主;压裂射孔时,减少碎粒煤射开厚度,能提高煤层压裂效果。

     

    Abstract: Coal seams at Hancheng block were damaged seriously by multi period tectonic movements and the coal structure is very complicated.The research of coal structure distribution law in Hancheng area is not sufficient at present.Thus, based on core samples and well logging data, this paper makes the logging identification of coal structure firstly, then studies the distribution law of coal structure and analyses the fracturing effect of different coal structures.The results show that the sensitivity factors of coal structure log response are well diameter and natural gamma.No.5 coal seam of Shanxi group mainly develops fragmented coal and fractured coal.Secondly, reducing the thickness of fragmented coal during perforating process can improve fracturing effect.

     

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