论文部分内容阅读
定量表征煤层气成藏效应对于有利区识别及开发方式选择具有指导意义.基于煤层气成藏控制因素分析,构建了表征煤层气成藏效应含气性、储层能量及流动能力三大关键要素定量模型.以服务于煤层气产能建设为目标,构建了耦合三大关键要素综合效应模型及四维煤层气成藏效应类型判别模式.按成藏耦合效应指数ξ>50×103,5×103~50×103,ξ<5×103将成藏效应划分为有利、中等、不利3个层次.在每一层次中,以煤层气富集指数100和200、煤层输导能力指数0.5和1.0以及煤层有效流体能量构成指数9和12为界,进一步划分出27种类型.以鄂尔多斯东部煤层为例,分析结果显示:研究区共有Ⅰ类有利区3种类型,Ⅱ类中等有利区18种类型.其中,Ⅰ类区主要分布在地鄂5井—榆24井北;Ⅱ类区包括大宁-吉县、榆17井区及台7井—榆47井一带.
Quantitative characterization of CBM accumulation plays an instructive role in the identification of favorable areas and the selection of development methods.Based on the analysis of controlling factors of CBM accumulation, three key elements of CBM accumulation, including gas-bearing, reservoir energy and fluidity, are constructed Quantitative model.To serve the construction of coalbed methane production capacity as the goal, the three key elements of coupled effects model and four-dimensional coalbed methane accumulation effect type discriminant model are constructed.According to the reservoir-formation coupling effect index ξ> 50 × 103,5 × 103 ~ 50 × 103, ξ <5 × 103, and the hydrocarbon accumulation effect is divided into three levels: favorable, moderate and unfavorable.In each level, with the CBM enrichment index of 100 and 200, the coalbed permeability index of 0.5 and 1.0 and the coal seam effective The fluid energy composition index of 9 and 12 as the boundary, and further divided into 27 types.Based on the East Ordos coal seam as an example, the results show that: the study area there are three types of favorable areas Ⅰ, Ⅱ Ⅱ 18 kinds of moderately advantageous areas, Type I areas are mainly located in Di 5-Yu 24 well; Class II areas include Daning-Jixian, Yu-17 and Taizai-Yu 47 wells.