黔北林华多煤层井田煤系气开发目标层段初选

    Preliminary selection of target intervals for coal measure gas development in Linhua multi-coal seam field of northern Guizhou

    • 摘要: 提出了林华井田多煤层区煤系气开发目标层段的初选方法,将林华井田煤系气目标层段初选步骤分为地质、工程2个部分,具体流程为:结合沉积环境,以划分含气系统为基础;并以煤体结构、脆性指数以及围岩力学性质作为工程约束评判指标,最终确定煤系气开发初选目标层段。结果表明:研究区龙潭组属于海陆交互相沉积下的还原沉积,具有煤岩层单层厚度薄,煤系气储层互层频繁的特点;根据煤岩含气性、煤岩组合可划分3种煤系气储层组合模式和4个含气系统;初选结果为:Ⅰa(958~968 m)、Ⅱb(942~955 m)、Ⅱc(910~933 m)、Ⅲd(878~904 m)和Ⅳe(864~876 m)5个层段可作为煤系气共采的优先目标层段。

       

      Abstract: The primary method for the target strata of coal-measure gas development in Linhua coalfield is proposed. The primary procedure of Linhua coal measure gas target strata is divided into two parts: geology and engineering. The specific process is as follows: combining with the sedimentary environment, based on dividing the gas-bearing system; the coal structure, brittleness index and the mechanical properties of surrounding rock are used as the evaluation indexes of engineering constraints to determine the primary target strata of coal measure gas development. The results show that the coal measure strata of Longtan Formation in the study area belong to reductive deposition under sea and land cross-deposition, which has the characteristics of “the thickness of single coal layer is thin, and the inter-bedding of coal measure gas reservoir is frequent”. According to the coal-rock gas-bearing property and coal-rock combination, three coal measure gas reservoir combination models and four gas-bearing systems can be divided. The gas-bearing systems have obvious reservoir physical property differences. It is considered that Ⅰa(958-968 m), Ⅱb(942-955 m), Ⅱc(910-933 m), Ⅲd(878-904 m) and Ⅳe(864-876 m)strata can be used as the priority target strata for coal measure gas co-production.

       

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