关于煤体结构判识方法的探讨

Discussion on methods of coal body structure identification

煤体结构是煤层气选区评价的关键地质条件,也是煤层气高渗高产的决定性因素。本文对煤体结构的判断方法进行了归纳,其一是通过煤心直接用肉眼进行鉴别;其二是通过测井曲线响应特征进行间接地定性或定量识别。分析认为:煤心鉴别法最直接、可靠,但受取心率、煤心污染破坏程度、取心成本及数量等因素的限制,在实际运用中有一定的局限性;测井曲线识别法是在大量数据中寻找煤体结构与各测井参数的规律特征,应用更广泛,需事先校正和处理测井数据,建立适合不同地区的测井解释图版。建立煤体结构判识图版,量化各测井参数对煤体结构的影响,对煤层气选区评价和后期的储层改造具有重要意义。

Coal body structure is a crucial geological condition in CBM exploration target op- timization, and is also a dominant factor influencing the permeability and production of CBM. Identification methods of coal body structure have been induced in the paper, one is direct identifying based on observation of coal cores, and other is indirect quantitative or qualitative identification by logging response characteristics. The analysis shows that coal cores identification is the most direct and reliable, but restricted by factors such as coring rate, pollution degree of coal cores, coring cost and quantity, et al, which have certain limits in practice applying.Identification by logging curves is widely applied with searching regu- larities and characteristics between coal body structures and logging parameters from abun- dant data, but need to revise and manage logging data before establishing different chartsfitting different areas. Establishment identification standard for coal body structures and quantization of effects of various logging parameters on coal body structures have important significance for CBM exploration target optimization and late reservoir reconstruction.