摘要
西湖凹陷油气藏类型以气藏、凝析气藏为主,气测烃组分以C_1为主,一般C1相对百分含量超过85%,随着勘探的深入,储集层越来越深、物性变差且深浅层气测显示变化大,气层的准确评价已成为录井油气解释评价的难题。针对该凹陷油气藏的特点和勘探现状,在应用常规气测全烃、烃组分参数的基础上,为了更真实地反映储集层的油气显示和异常显示幅度,引入地表单位岩石甲烷气体体积(V_(C1))和甲烷异常倍数(B_(C1))两个气测解释参数,在参考该凹陷渐新统花港组录井初步解释238个储集层的C_1与V_(C1)交会分析数据并以其中有油气测试结论的16个层两参数交会分析数据为基础,结合甲烷异常倍数、全烃以及全烃峰形特征,建立了西湖凹陷花港组气层录井解释评价标准。实际应用结果表明,该方法简便可行,可作为该凹陷渐新统花港组气层的一种有效解释评价方法。
The type of oil and gas reservoirs in Xihu sag is dominated by gas and condensate gas reservoirs,gas logging hydrocarbon components are mainly C_1,generally,C_1 relative percentage content is more than 85%.With in-depth exploration,reservoirs are deeper and deeper,physical properties are poorer and poorer,and gas logging shows in deep and shallow layers change rapidly,thus an accurate evaluation for gas reservoirs has become a problem of mud logging interpretation and evaluation.According to the characteristics and exploration status of the reservoirs in the sag,and on the basis of applying conventional gas logging total hydrocarbon,hydrocarbon component parameters,in order to realistically reflect the oil and gas shows and the width of abnormal shows in the reservoirs,the authors introduced two gas logging interpretation parameters:rock methane gas volume of surface unit(V_(C1)) and methane abnormal multiple(B_(C1)),on the basis of referring the intersection and analytical data of C_1 and V_(C1) obtained from mud logging preliminarily interpreting 238 reservoirs in Oligocene Huagang formation,Xihu sag and the intersection and analytical data of C_1 and V_(C1) obtained from 16 layers which had oil and gas test results,combined with methane anomaly multiples,total hydrocarbon and total hydrocarbon peak features,the authors established the gas layer mud logging interpretation and evaluation criteria for Huagang formation,Xihu sag.Practical application results showed that this method is simple and can be used as an effective gas reservoir interpretation and evaluation method for the gas layers in Oligocene Huagang formation,Xihu sag.
出处
《录井工程》
2015年第4期41-45,94-95,共5页
Mud Logging Engineering
关键词
西湖凹陷
气层
气测录井
地表单位岩石甲烷气体体积
甲烷异常倍数
解释
标准
Xihu sag
gas layer
gas logging
rock methane gas volume of surface unit
methane abnormal multiple
interpretation
criteria
