杭锦旗什股壕区带盒2+3段气水识别及分布规律  

Gas-water identified by well logging and its distribution laws:Example from Shihezi 2 and 3 members,Shiguhao block,Hangjinqi area

作　　者：范玲玲[1] FAN Lingling(Exploration and Development Research Institute,Sinopec North China E&P Company,Zhengzhou,Henan 450006,China)

机构地区：[1]中国石化华北油气分公司勘探开发研究院,河南郑州450006

出　　处：《天然气技术与经济》2021年第5期1-6,共6页Natural Gas Technology and Economy

基　　金：中国石油化工股份有限公司科技部科研项目“鄂尔多斯盆地晚古生代盆地原型与油气成藏过程研究”(P21088-2)资助。

摘　　要：为了解决鄂尔多斯盆地杭锦旗地区什股壕区带二叠系下石盒子组盒2+3段气藏气水分布规律及其控制因素不明确的问题,以盒2+3段储层为研究对象,利用钻井和测井电性特征资料,结合试气成果,采用测井曲线交会图版法建立了盒2+3段储层流体类型的测井识别标准,分析了沉积微相、局部微幅构造对盒2+3段气藏气水分布的影响,指出了气水分布的控制因素。研究结果表明:①声波时差-深侧向电阻率和补偿中子-深感应电阻率交会图版法可以有效地识别出气层、含气层、气水同层、含气水层、水层和干层,气层声波时差下限值为220μs/m,深侧向电阻率不小于18Ω·m且与声波时差相关,补偿中子孔隙度小于16%;②研究区盒2+3段储层气水分布主要受沉积微相和局部构造的共同影响。砂体展布情况是控制气水分布规律的基础,河道中心位置的心滩微相物性好、含气性好;③在局部构造低部位含气性差,局部构造高部位含气性较好。结论认为,该研究成果明确了盒2+3段沉积有利区与局部构造高点叠合区砂体含气性较好,为有利目标区,为研究区盒2+3段致密砂岩勘探选区提供了依据和方法,实钻证实勘探效果好。For the gas reservoirs of Lower Permian Shihezi 2 and 3 members,Shiguhao block,Hangjinqi area,Ordos Basin,in order to clarify the gas-water distribution laws and its control factors,some well-logging standards to identify fluid type were formulated by means of a crossplot chart method based on drilling and well-logging electrical characteristics along with combined with well-testing data.Then,the effects of sedimentary microfacies and local micro-amplitude structure on the gas-water distribution were analyzed,and the factors affecting its distribution were pointed out.Results show that(1)the interval transit time-deep lateral resistivity and compensated neutron-deep induction resistivity crossplot chart methods can effectively identify pure gas layer,gas-bearing layer,gas-water layer,gas-bearing water layer,water layer,and dry layer.In a pure gas layer,the minimum interval transit time is 220μs/m,the deep lateral resistivity is equal to or higher than 18Ω·m and correlated with the interval transit time,and the compensated neutron is less than 16%;and(2)the gas-water distribution in Shihezi 2 and 3 members is under joint influence of sedimentary microfacies and local structure.The distribution of sandbody is the base.The point bar microfacies in channel center are featured by better physical property and gas-bearing property.The gas-bearing property is worse in the low position of local structure whereas better in the high position.In conclusion,the results not only may confirm that the sandbodies in the superimposed areas of Shihezi 2 and 3 members available for sedimentation area and local structural high are characterized by better gas-bearing property,so they are favorable targets,but also provide basis and method for selecting Shihezi 2 and 3 members as tight sandstone exploration targets,whose practical exploration effect has been proved to be remarkable.

关 键 词：鄂尔多斯盆地 杭锦旗地区 什股壕区带 盒2+3段 致密砂岩 气水识别 分布规律 

分 类 号：P618.13[天文地球—矿床学]