摘要
鄂尔多斯盆地延川南区块是我国第一个商业开发的深部煤层气田,目前处于上产阶段。构造分异作用导致煤层气井产气产水差异显著。综合分析了岩心、测录井、产出水地球化学数据及排采井生产等资料,探讨了该区块煤层气富集高产的地质控制作用。根据研究结果,将区块划分为东、西2个水文地质单元,其中东部谭坪水文地质单元的水动力强度较西部万宝山区大。延川南区块山西组2号煤层水处于弱径流—滞流区,地层水矿化度高,适宜的水文地球化学参数分布区有利于煤层气的富集。基于煤体结构测井解释,发现碎裂煤发育区煤层气井易高产,建立了区块范围内煤层气富集高产选区参数指标体系,优选出4个有利区,为区块后续开发提供了接替区。
Yanchuannan block is China＇ s first commercial development of deep coalbed methane field in southeast Ordos Basin, and now in the stage of the production.Due to the different main burial depth of coal seams, there is significant difference between gas and water production in the gas fields.Using comprehen- sive analysis of the large number of well logging interpretation, taking the test of ground water geochemical and production wells working condition as a basis, we discuss the geological controlling effect on the enrichment and high-yield of coalbed methane in Yanchuannan block.It can be divided into east and west two hydrogeological units,and the hydrodynamic intensity in eastern Tanping is higher than that in the west Wanbaoshan block.High ground water salinity in the weak runoff-retention area of Yanchuannan, and suitable hydro-geochemical parameters were in favor of coalbed methane enrichment.Based on the analysis of well logging interpretation of coal structure,it is found that the high-yield area was distributed in the cataclastic structure coal development zone, therefore, selection criteria of coalbed methane enrichment and high-yielding have been established,in Yanchuannan area and the four favorable area will provide backup relay area for the gas field of subsequent development.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2016年第11期2093-2102,共10页
Natural Gas Geoscience
基金
中国石化华东分公司科技项目(编号:34600000-15-ZC0613-0011)资助
关键词
鄂尔多斯盆地
延川南区块
煤层气
富集高产
水化学
Ordos Basin
Yanchuannan area
Coalbed methane
Enrichment ＆ highyleld
Geochemical
