胜北洼陷中侏罗低饱和致密砂岩油气藏地质工程一体化攻关与实践  

Research and practice of geology-engineering integration for Middle Jurassic tight sandstone reservoirs with low saturation in Shengbei depression

作　　者：郭旭东 康纪勇 李森木 崔彦立 高启轩 王祖刚 Guo Xudong;Kang Jiyong;Li Senmu;Cui Yanli;Gao Qixuan;Wang Zugang(Exploration Division of PetroChina Tuha Oilfield Company,Hami,Xinjiang 838202,China)

机构地区：[1]中国石油吐哈油田公司勘探事业部

出　　处：《天然气勘探与开发》2022年第3期123-131,共9页Natural Gas Exploration and Development

基　　金：中国石油天然气股份有限公司重大攻关专项“吐哈页岩油/致密油气体积改造技术提升攻关与现场试验”(编号:KFSYNB2021005)。

摘　　要：吐哈盆地胜北洼陷中侏罗系储层油气藏埋深大、物性致密、含油气饱和度低,前期采用直井常规压裂方式,单井产量低,多为低产油气层或含油气水层,该区域勘探一直未能获得突破。2019年始,突破传统地质成藏认识,借鉴和应用非常规储层油气勘探方法,开展地质工程一体化攻关和实践,获得了中侏罗统深层低饱和度致密砂岩油气藏的勘探突破:①确认胜北洼陷中侏罗统发育七克台和三间房2套低饱和度致密砂岩油气藏为高含量凝析油气藏,且呈整体连片含油气态势,储层甜点控制油气富集程度;②地质工程一体化攻关让长期蛰伏的胜北中侏罗统低饱和致密砂岩油气藏储量得到有效动用。总结其关键技术为:①“两宽一高”地震采集下的储层精细预测技术;②致密气层核磁共振测井精细解释;③深层水平井优快钻井工艺;④水平井细分切割多段压裂和压后控压返排技术。The Middle Jurassic reservoirs in Shengbei depression of the Turpan-Hami Basin are characterized by large depth,tight physical properties and low oil/gas saturation.In the early stage,the conventional fracturing of vertical wells was adopted,resulting in low production of single well.Most reservoirs are low yield or hydrocarbon-bearing aquifers.Therefore,no breakthrough of exploration has been achieved in this area.Since 2019,with new understandings of geological reservoir formation,through exploration methods for unconventional reservoirs,the geology-engineering integration has been applied to the Middle Jurassic deep tight sandstone reservoirs with low saturation to make exploration breakthroughs.It is confirmed that the two tight sandstone reservoirs(Qiketai Formation and Sanjianfang Formation)developed in Shengbei depression are rich condensate gas reservoirs,with hydrocarbon distributed continuously.And the sweet spots control the hydrocarbon enrichment.The research on geology-engineering integration has allowed the reserves in these reservoirs to be recovered effectively.The key technologies include:(1)fine reservoir prediction based on"two widths and one height"(2W1H)seismic data acquisition,(2)NMR logging interpretation for tight gas layer,(3)optimal and fast drilling of deep horizontal well,and(4)horizontal well subdivided multi-stage fracturing and post-frac managed pressure flowback.

关 键 词：胜北洼陷 致密砂岩 低饱和油气藏 细分切割压裂 

分 类 号：P618.13[天文地球—矿床学]