摘要
苏里格气田天然气层具有低孔隙度、低渗透率、低丰度的特点,储集层非均质性强、成藏类型多、气水关系复杂、低电阻率气层与高电阻率气层共存,储集层气水分布受构造、物性及成岩作用共同影响,虽然气测录井可识别气层的含气性,但是难以有效评价气层的含水性。针对该问题,在分析天然气储集层核磁共振录井谱图特征的基础上,利用核磁共振录井技术具有识别储集层含水性的优势,引入可动水指数,将该指数与孔隙度建立交会图板并据此形成解释评价标准,对天然气储集层含水性进行评价。应用分析结果表明,储集层含水性解释评价符合率较高,以气测录井解释的储集层含气性结果为基础,利用该标准对其含水性进行识别,可有效实现储集层的快速准确评价。
The gas reservoirs in Sulige Gasfield has the features of low porosity,low permeability and low abundance,reservoir heterogeneity is strong with various types of accumulation,gas and water relations are complex,low-resistivity and highresistivity gas reservoirs coexist,the distribution of reservoir gas and water is affected by structures,physical properties and diageneses.Although gas logging can identify gas-bearing property of gas reservoirs,it is difficult to effectively evaluate the aquosity of gas reservoirs.To solve the problem,based on analyzing the features of NMR logging spectrograms in gas reservoirs,NMR logging technique was used to identify the aquosity of reservoirs,the movable water index was introduced,then the intersection chart can be established by the index and porosity,the interpretation and evaluation criteria accordingly formed to evaluate the aquosity of gas reservoirs.Application results showed that the coincidence rate for interpreting and evaluating the aquosity of reservoirs was higher.Based on gas-bearing property results of reservoirs from gas logging interpretation,using the criteria to identify its aquosity can effectively achieve fast and accurate evaluation for reservoirs.
出处
《录井工程》
2014年第2期51-54,101,共4页
Mud Logging Engineering
关键词
天然气
储集层
气测录井
核磁共振录井
谱图特征
可动水指数
孔隙度
标准
natural gas
reservoir
gas logging
NMR logging
spectrogram characteristic
movable water index
porosity
criterion
