摘要
为了解决莺歌海盆地东方区中新统黄流组高温高压气藏气水关系复杂导致的井位部署难题,以东方区黄流组气藏为研究对象,综合钻录井、地震、测井、测压、测试等各项资料,在沉积微相、砂体精细刻画及砂体连通性评价研究成果的基础上,分析了研究区气水分布的3种类型及其成因;进而根据各类水体成因、所处空间位置及与之接触的气藏规模等指出了研究区的两种气水分布模式,并提出了有针对性的开发建议。研究结果表明:①研究区黄流组重力流海底扇沉积机制和沉积过程的复杂性导致砂体叠置连通关系复杂,从而影响了气水分布;②研究区存在构造+岩性控制的大型整装边水气藏和小型岩性圈闭气藏两种气水分布模式。结论认为:①构造+岩性控制的大型整装边水气藏是研究区主要的气藏类型,主要分布在研究区大型侵蚀水道连片发育区,形成该类气藏的主要原因是砂体厚度大、砂体连通性以及物性较好、气水分异明显,开发井应避开边水,部署在构造中高部位;②小型岩性圈闭气藏是研究区的次要气藏类型,主要分布在研究区的沉积前端和边部,此类气藏砂体连通性复杂,多为孤立砂体,应尽可能通过在砂体构造高部位部署水平井来开发。
In Dongfang block,Yinggehai Basin,the gas-water relationship in high-temperature and high-pressure gas reservoirs of Huangliu Formation is complex,which makes it difficult to carry out well deployment.So,combined with some drilling,well logging,seismic,pressure measurement,and testing data,the Huangliu gas reservoirs in this block were taken as objectives to analyze three types of gas-water distribution and their geneses based on sedimentary microfacies,fine sandbody description,and connectivity evaluation.Then,according to the geneses of various waterbody,its spatial location and scale of contacted gas reservoirs,two gas-water distribution modes were pointed out.Finally,several corresponding development suggestions were made.Results show that(1)the complex sedimentation mechanisms and process of gravity-flow submarine fan in the Huangliu Formation may complicate sandbody superposition and connection relationship,so as to affect gas and water distribution;and(2)there are two gas-water distribution modes in the study area,including the structureand lithology-controlled large-scale monoblock gas reservoirs with edge water and the small-scale gas reservoirs of lithological trap.In conclusion,the former is the main type of gas reservoirs in the study area.And these gas reservoirs are mainly distributed in the part where large erosion channels are developed continuously.The principle reasons for their formation are thick sandbody,better connectivity and physical properties,and obvious gas and water differentiation,so development wells shall be deployed at the structural high and middle position,away from edge water.In addition,the smallscale gas reservoirs of lithological trap belong to the secondary ones,which are mainly distributed at the front end and side of deposit.Most sandbody in these gas reservoirs has complex connectivity and is mostly isolated.Therefore,to develop this type of gas reservoirs,it is necessary to deploy horizontal wells at the structural high position of sandbody as much as possible.
作者
周伟
王勇标
王玉
莫冯阳
彭旋
吴倩
Zhou Wei;Wang Yongbiao;Wang Yu;Mo Fengyang;Peng Xuan;Wu Qian(CNOOC Zhanjiang Company,Zhanjiang,Guangdong 524057,China)
出处
《天然气技术与经济》
2020年第5期20-27,共8页
Natural Gas Technology and Economy
关键词
莺歌海盆地
东方区块
中新统黄流组
高温高压气藏
气水分布
气藏模式
Yinggehai Basin
Dongfang block
Miocene Huangliu Formation
High-temperature and high-pressure gas reservoir
Gas-water distribution
Reservoir model
