大牛地气田大17井区太1段气藏产能主控因素及开发调整对策  

Main influential factors of productivity and countermeasures against development adjustment: Example from gas reservoirs of Taiyuan 1 Member, Da 17 well block,Daniudi gasfield

作　　者：景琛 JING Chen(No.1 Gas Production Plant,Sinopec North China Company,Zhengzhou,Henan 450006,China)

机构地区：[1]中国石化华北油气分公司采气一厂,河南郑州450006

出　　处：《天然气技术与经济》2022年第5期1-6,14,共7页Natural Gas Technology and Economy

摘　　要：为了明确鄂尔多斯盆地大牛地气田大17井区石炭—二叠系太原组1段气藏产能主控因素,以11口水平井为研究对象,分析了该区太1段气藏生产动态特征,明确了沉积、构造对气井生产的影响情况,并有针对性地制定了开发调整对策。研究结果表明:(1)太1段气藏11口水平井中Ⅰ类井共8口,初期产能高,稳产期长,液气比低,生产效果较好;Ⅱ类井共3口,初期产能较低,稳产期短,液气比相对较高,生产效果较差。(2)Ⅰ、Ⅱ类井储层厚度无明显区别,但储层物性存在差异,Ⅰ类井自然伽马曲线以低幅平滑箱形为主,电阻率较高,孔隙度、渗透率均较高,物性较好;Ⅱ类井自然伽马曲线齿化严重,电阻率较低,物性较差,含水量较高。(3)沉积模式不同导致Ⅰ、Ⅱ类井储层物性存在明显的差异,Ⅰ类井处于迎水面,储层物性好,产量高,液气比低,累计产量高;Ⅱ类井处于背水面,物性差,内部泥岩夹层发育、电阻率低,束缚水含量高导致液气比高,影响气井产能释放。结论认为:(1)太1段气藏气井产能主要受沉积控制,障壁砂坝迎水面储层物性好,气井产能高,为老区开发调整的有利区;(2)通过在砂坝迎水面部署加密井,优化老井生产制度,可以有效提高气藏采收率。In order to determine the main factors influencing on productivity in gas reservoirs of Taiyuan 1 Member, Da 17 well block, Daniudi gasfield, 11 horizontal wells were taken as examples to analyze dynamic production characteristics in these reservoirs, clarify effects of both sedimentation and structure on their production and make countermeasures against development adjustment. Results show that,(1) according to dynamic characteristics,these 11 wells can be classified into type I and type II. 8 wells with type I feature high initial productivity,long stable production period, low liquid/gas ratio and better production effect while 3 wells with type II are characterized by low initial productivity, short stable production period, high liquid/gas ratio and worse production effect;(2) reservoirs in type I and type II wells are different in physical properties, but subtle disparity in their thickness. GR curves in Type I wells majorly represent low-amplitude smooth box in shape, and the reservoirs are provided with higher resistivity, porosity and permeability and better physical properties, while type II wells emerge tooth-shaped GR curves, standing for corresponding reservoirs with low resistivity, poor physical properties and high water cut;and(3) sedimentation modes are diverse, which may cause obvious difference in physical properties between two types of wells. Located at the upstream face, the type I wells boast good physical properties, high production rate, low liquid/gas ratio and high cumulative production. The type II wells are situated at the downstream face and featured by poor physical properties, interbedded mudstones and low resisitivity, as well as rich connate water bringing about high liquid/gas ratio further to affect productivity release. In conclusion, for Taiyuan 1 gas reservoirs, their productivity is mainly affected by sedimentation, and the upstream face of barrier bar serves as a profitable adjustment zone of mature area due to its good physical properties and high productivity. Additional

关 键 词：鄂尔多斯盆地 大牛地气田 太原组1段气藏 生产动态分析 产能主控因素 开发调整对策 

分 类 号：TE323[石油与天然气工程—油气田开发工程]