基于动静态响应特征的水平井剖面流体识别及评价

低孔渗油气层的复杂油气藏越来越多,而这些区块又具有良好的资源开发潜力,是油田上产的主力区。这些区块不仅油藏复杂,而且水平井技术应用广泛,对于水平井而言,其钻井方式相当特殊,且受到其他各种因素的综合影响,使得测井响应特征更加复杂,致使油水层识别更难,同时给油藏评价带来很大困难。然而油水层识别出后,不仅可以为后期投产的油井有效厚度的划分和一些缓钻井是否实施提供一定的依据,而且为油田新区射孔方案及井别方案编制提供了较为准确的基础数据。因此,以泾河油田17井区长8油藏为例,针对该研究区的典型水平井提取多个常规测井响应特征参数,利用图版法建立交会图,先划分出水平井剖面流体类型的电性参数识别标准,在上述研究基础之上再根据P1/2正态概率法进一步划分水平井油水层识别标准,编制计算机代码,执行宏命令对研究区典型水平井进行油水层识别,并结合生产动态数据进行验证;其吻合度较高,说明该套综合性流体类型识别方法在水平井中行之有效,在地质条件相当的区块此方法可以推广运用。

The fluid identification and evaluation of the horizontal well section based on the dynamic and static response characteristics

There are more and more low permeability reservoirs and complicated reservoirs,and these districts are with good development potential of the resources,it is the main production zone for the oil field. The reservoirs of these districts are not only complex, and horizontal well technology in these districts is also applied widely,for horizontal Wells, the drilling way is so special,and affected by other factors it makes response characteristics of the logging is more complicated,it is so harder for the identification of oil and water layer,meanwhile it brings great difficulty for the evaluation of reservoir. However, after the oil and water layer is identified,it can provide some basics for the effective thickness division of oil well which is in the late production and whether some slow drilling is implemented,and more accurate basic data for the perforation scheme of oilfield and compiling the well types scheme. Therefore, this article mainly takes Jinghe 17 well area and chang 8 reservoir as an example,extracting multiple conventional log response characteristic parameters of the typical horizontal Wells in the study area,establishing a crossplot by the engraving method,differentiating the standard of electrical parameters of horizontal well section for fluid type identification firstly,based on the above research, according to the P_1/2 normal probability method for identifying oil and water layer further,preparing the computer code and carrying macro command,and identifying oil-water layer of the typical horizontal well in the study area,combining with production dynamic data for validation,the goodness of fit is high,it means that the set of comprehensive identification method for fluid types of horizontal well is effective,this method can be used widely in the similar geological conditions.