煤系气联合开发甜层评价方法研究
Study on sweet layers evaluation method for coal measures gas joint development
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摘要: 选取影响煤系气开发的主要地质因素，采用多层次模糊数学法构建了煤系气开发甜层评价体系，其中各类储层的可改造性权重最高，资源丰度其次，可采性所占权重相对较低。在此基础上，对河南平顶山矿区HN-02井主采煤层所在下石盒子组和山西组地层进行甜层评价，优选出15个甜层，包含煤层7层、泥页岩甜层7层、致密岩甜层1层；各甜层中，二1煤、四2煤及其底板炭质泥岩具有良好的资源条件，四3煤顶板细砂岩与泥岩、四2煤底板薄煤层与炭质泥岩、下石盒子组底部泥岩具有较高的可改造性。煤系气开发阶段，优先对甜层进行射孔、压裂，有利于在有限的施工规模下提升井控范围内可采资源量、储层改造效果，进而促进煤系气高效产出。Abstract: This paper selects the main geological factors that affect the coal measure gas （CMG） development, and adopts a multi-level fuzzy mathematical method to construct a sweet layer evaluation system. Among the factors concerned, the reservoir reformability possesses the highest weight, followed by the resource abundance and the gas recoverability. On this basis, the lower Shihezi and Shanxi formations of a vertical well（HN－02） in Pingdingshan Mining Area is evaluated for selecting CMG development sweet layers. As a result, 15 sweet layers are selected, including 7 coal seams, 7 shale layers and 1 tight sandstone layer. Among these sweet layers, the 21 coal, the 42 coal and its floor carbonaceous mudstone have good resource conditions. The 43 coal roof fine sandstone and mudstone, the 42 coal floor thin coal seam and carbonaceous mudstone, as well as the bottom mudstone of the lower Shihezi Formation possess high reformability. During the CMG development stage, the sweet layers are suggested to be perforated and fractured preferentially, which would be conducive to improve the recoverable resources within the well control range and the reservoir stimulation effect under an limited fracturing scale, so as to promote the efficient production of coal measure gas.
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