大佛寺井田构造对煤层气井产能的控制机理  

Structure Controlling Mechanism on CBM Well Production Capacity in Dafosi Minefield

作　　者：汪万红 Wang Wanhong(Xi'an Research Institute, China Coal Technology and Engineering Group Corp, Xi'an, Shaanxi 710054)

机构地区：[1]中煤科工集团西安研究院有限公司

出　　处：《中国煤炭地质》2019年第5期18-21,35,共5页Coal Geology of China

基　　金：陕西省基础研究项目2016012012;天地科技股份有限公司科技创新创业资金专项项目2018-TD-MS067

摘　　要：以大佛寺井田构造和演化特征为基础,结合地面煤层气开发实际情况,分析了构造与煤层气井产能的关系,探讨了构造演化和构造对煤层气井产能的控制机理。研究表明:大佛寺井田煤层气井产能与构造部位密切相关。产气好的直井基本位于主体构造背斜的轴部附近和次级构造向斜的轴部附近;产气差的直井位于主体构造向斜的轴部附近和次级构造背斜的轴部附近。井田主体构造祁家背斜轴部附近煤储层较好的渗透性和次级构造向斜轴部附近煤储层较好的含气性共同控制了井田煤层气井的高产区。建议后期井位部署首选次级构造向斜轴部和主体构造背斜轴部相互重叠的区域。Based on structural and evolutional features in the Dafosi minefield, combined with surface CBM exploitation reality have analyzed relationship between structures and CBM well production capacity, discussed structural evolution and structure controlling mechanism on CBM well production capacity. The study has shown that the production capacity is closely related to structural positions. Better production capacity straight wells are basically positioned near anticline axis of main structure or syncline axis of secondary structure;poorer production capacity straight wells positioned near syncline axis of main structure and anticline axis of secondary structure. Coal reservoir with better permeability near the minefield main structure Qijia anticline axis and better gas-bearing coal reservoir near secondary syncline axis have jointly controlled minefield CBM well high yield zone. It is suggested that the preferred well deployment of later stage should be in overlapping regions of secondary structure syncline axis and main structure anticline axis.

关 键 词：构造 煤层气井 产能 控制机理 大佛寺井田 

分 类 号：P618.11[天文地球—矿床学]