柴达木盆地台南气田边水水侵影响因素及剩余气分布特征研究  

Study on influence factors of edge water influx and distribution characteristics of remaining gas in Tainan gas field,Qaidam Basin

作　　者：孙永亮 王小鲁[2] 王玉善 柴小颖[2] 李国良 敬伟 赵坤梅 SUN Yongliang;WANG Xiaolu;WANG Yushan;CHAI Xiaoying;LI Guoliang;JING Wei;ZHAO Kunmei(Oil & Gas Cooperative Development Branch,BHDC,CNPC,Tianjin 300457, China;Qinghai Oilfield Exploration and Development Research Institute, CNPC, Dunhuang, Qinghai 736202, China;No.1 Mud Logging Company,BHDC,CNPC, Tianjin 300280, China)

机构地区：[1]中国石油渤海钻探工程有限公司油气合作开发分公司,天津市300457 [2]中国石油青海油田公司勘探开发研究院 [3]中国石油渤海钻探工程有限公司第一录井分公司 [4]中国石油渤海钻探油气合作开发分公司地质研究院,天津市300457

出　　处：《录井工程》2020年第2期106-112,共7页Mud Logging Engineering

基　　金：中国石油天然气股份公司重大科技专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”(编号:2016E0106GF)。

摘　　要：柴达木盆地台南气田是典型的边水驱动疏松砂岩气田,储集层非均质性强,单砂体非均质水侵现象明显。利用岩心水驱气渗流实验和数值模拟手段,研究气田开发过程中边水水侵的影响因素,包括储集层毛管力、气水粘度差、孔喉半径、采气速度和水体体积。结果显示,在均质储集层中边水水侵近似活塞驱动,在非均质储集层中,随着采气速度增大,边水容易沿高渗带形成局部突进,且自3~5倍渗透率级差开始突进明显。根据剩余气含气面积、含气饱和度、储量丰度的变化规律,将剩余气分为六种类型,剩余气富集区主要分布在未水侵气区构造高部位。边水侵入气藏后水侵区剩余气含气饱和度大幅下降,平均为33%左右,故适当降低配产,有利于提高采收率。Tainan gas field in Qaidam Basin is a typical edge water flooding loose sandstone gas field.The reservoir has strong heterogeneity and obvious phenomenon of single sand body heterogeneous water influx.Water flooding gas seepage of core experiments and numerical simulation methods were used to study the influence factors of edge water influx during gas field development,including reservoir capillary force,water-gas viscosity difference,pore throat radius,gas recovery rate and volume of water.The result showed that in homogeneous reservoirs,edge water influx approximated piston drive.In heterogeneous reservoirs,edge water easily formed a partial flooding along the high permeability zone with the increase of gas recovery rate,and the flooding was obvious since 3 to 5 times the permeability difference.The remaining gas was divided into six types according to the change rule of gas bearing area,gas saturation and reserve abundance of remaining gas.The remaining gas enrichment area is mainly distributed in the tectonic high part of zone with no water influx.The remaining gas saturation in water influx zone declined sharply,about 33%,after the edge water invaded the gas reservoir,thus the production allocation was appropriately reduced,which was good for recovery efficiency improvement.

关 键 词：台南气田 水侵 高渗带 剩余气 储量丰度 饱和度 

分 类 号：TE132.1[石油与天然气工程—油气勘探]