GIS支持下的沁水煤田南部煤层气综合地质选区

根据对沁水煤田南部地质背景和煤层含气地质因素的研究 ,筛选出含气量、构造部位、纯煤厚度、储层压力梯度、有效埋藏深度为主要评价因素 ,在综合地质选区模型上 ,采用了地理信息系统 (GIS)支持下的权重叠加模型和模糊综合评判模型 ,引入了煤层气可采度作为煤层气选区评价 (可采性等级区划 )的衡量指标 ,获得了一批表示煤层气可采性的新数据。通过对这些数据进行域的圈定 ,划分出煤层气可采性有利区、较有利区、不利区三个等级 ,获得了沁水煤田南部煤层气可采性区划结果

SYNTHETICAL GEOLOGICAL SELECTED AREAS OF COALBED GAS RESERVOIRS WITH THE AID OF GIS IN THE SOUTH OF THE QINSHUI COALFIELD

Through the study of the geological background and gas content of the coalbeds in the south of the Qinshui coalfield, gas content, geological structure, coal thickness, pressure grades and effective embedding deepness as primary factors are picked out in this paper. During the research of evaluating and selecting areas synthetically, the authors set up the models of weight overlap and fuzzy synthesis judgement with the aid of GIS, adopt the produced ratio of coalbed is was adopted as an important indicator appraising the coalbed gas, and acquire a new set of data to denote the recoverability of coalbed gas. On the basis of these data, the authors mark out three classes, that is, the favorable block, less favorable block and unfavorable block. These results are more reasonable and scientific than previously selected blocks.