气测录井3R渐趋法在凝析气藏解释评价中的应用  

3R method of gas logging in interpretation and evaluation of gas condensate reservoirs

作　　者：刘玉梅[1] 侯国文[1] 龚艳春[1] 周育文[1] 陈代厚 蔡茂佳[2] 廉梅[1] 

机构地区：[1]中国石油大港油田公司勘探开发研究院 [2]中国石油大港油田公司

出　　处：《录井工程》2013年第4期33-35,83,共3页Mud Logging Engineering

基　　金：中国石油天然气股份有限公司重大专项"渤海湾盆地精细勘探技术与滩海地区大油气田分布规律"(编号:2008E-030600)

摘　　要：ZH 5区块古近系沙二段上部气藏属于正常压力系统,为中孔隙度、中渗透率,带油环的凝析气藏,应用气测录井的皮克斯勒烃比值法、3H法、三角形图板法等解释方法,无法对该带油环的凝析气藏中油环和气顶部位的控制井进行油层和气层的有效解释,且投入开发生产时考虑有气顶的存在,高部位的井至今没有射孔投产,加之是大斜度定向井,部分井没有实施三孔隙度测井,给气层的识别带来难度,为了落实储量规模,需要划分气层和油层有效厚度,从而确定气藏的合理含气油边界。通过对该气藏19口井60层气测录井烃类气体组分显示特征分析,发现气层的气测异常明显,全烃曲线多呈箱形,气层与油层的组分及组分的相对含量有明显区别。针对上述问题,提出3R气测录井解释图板,将不同烃类比值之间的关系用渐趋法表示为线性函数,为油气层的识别提供了有效手段。在该气藏的实际应用表明,其解释符合率达87%以上,效果较好。Gas reservoir in Paleocene upper Es1 of ZH 5 block belongs to normal pressure system,and a gas condensate reservoir with medium porosity,medium permeability and oil rings,Pixler hydrocarbon ratio method,3H law and the triangle chart method can′t effectively interpret the oil and gas layers of the control wells that lie between the oil ring and the gas cap in the gas condensate reservoir with oil rings,and the wells of high parts haven′t been perforated for the production so far because of the consideration of the presence of agas cap while development.Coupled with high-inclination directional wells,some wells haven′t been implemented 3-porosity logging,which brings difficulties to identify gas layers.In order to decide the reserve scale,the net thickness of oil and gas reservoirs needs to be divided to determine the reasonable hydrocarbon boundaries of gas reservoirs.The 60 layers from 19 wells in the gas reservoir were analyzed on their gas logging showing characteristics of hydrocarbon gas composition,the authors found that gas logging anomalies in gas layers were significant,most of total hydrocarbon curves are in the shape of box,the components from gas and oil layers and the relative contents of the components are significant differences.Thus,3R gas logging interpretation chart was provided for the above problems,the relationship between the ratios of different hydrocarbons was expressed as a linear function by the gradual method to provide an effective means to identify hydrocarbon reservoirs.The practical application in the gas reservoir showed that its interpretation coincidence rate was over 87% and the results were better.

关 键 词：凝析气藏 解释图板 线性函数 气测 烃组分 

分 类 号：TE142[石油与天然气工程—油气勘探]