常压页岩气背斜构造分区生产特征研究——以平桥南区为例  

Study on production characteristics of normal-pressure shale gas anticline structure zoning:A case study in southern Pingqiao District

作　　者：马波[1] MA Bo(Sinopec Chongqing Shale Gas Co.,Ltd.,Chongqing 408400,China)

机构地区：[1]中国石化重庆页岩气有限公司,重庆408400

出　　处：《非常规油气》2023年第3期80-88,120,共10页Unconventional Oil & Gas

基　　金：国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061);中国石化科技部项目“南川复杂构造带页岩气勘探开发关键技术”(P19017-3)。

摘　　要：为了明确常压页岩气在背斜构造不同构造位置的生产特征,摸清分区的生产规律和影响因素,从静态、动态及压裂改造3方面入手,结合平桥南区生产实际,分析归纳出不同构造位置气井的产气量、产液量、压力变化的差异特征及影响因素。结果表明:1)平桥南区背斜构造破裂压力主体区低向两翼变大的特征,主体(破裂压力为55~80 MPa)发育层理缝及易形成复杂缝网,轴部(相对主体略高约10 MPa)发育高角度缝,两翼(破裂压力为80~110 MPa)裂缝欠发育及压裂施工难度最大;2)试气产量和套压主体区最高,轴部其次,两翼最低,无阻流量特征一致;3)生产特征差异较大,主体区产量高、稳产时间长、弹性产率高、单井可采储量高等特点,轴部略差于主体,两翼井产量低、递减相对较大、单井可采储量为主体的59%,显示主体区开发效果最好。以上成果认识为常压页岩气开发选区和部署优化提供技术支撑。In order to clarify the production characteristics of Normal-pressure shale gas in different tectonic positions of anticlinal structure,and to find out the production rules and influencing factors of zoning,difference characteristics and influencing factors of gas production,liquid production and pressure of gas wells in different structural positions are analyzed and summarized,based on static、dynamic and fracturing,combined with the production practice of southern Pingqiao District.The results show that:1)The characteristics of fracture pressure in the main area are low and increased to two wings of anticline structural in the southern Pingqiao District,the main area(fracture pressure 55~80 MPa)develop bedding fracture and easy to form complex fractures networks,the axis area(slightly higher than the main area about 10 MPa)develops high angle fracture,the natural fractures of two wings(fracture pressure 80~110 MPa)are not developed and the construction difficulty is maximum;2)The test gas production and casing pressure are highest in the main area,followed by the axis,and lowest in the two wings,while the open flow characteristic have no differences in the 3 areas;3)There are large difference in production characteristics:the main area is characterized by high production,long stable production time,high elastic production rate and high recoverable reserves,while the characteristics of axis area are slightly worse than the main area,the two wings have lower production and relatively larger decline rate,the recoverable reserves of single well account for 59%of the main area,indicating the best development effect of the main area.The results above provide technical support for the develop selection and deployment optimization of normal-pressure shale gas.

关 键 词：平桥南区 常压页岩气 背斜构造 生产特征 影响因素 

分 类 号：TE357[石油与天然气工程—油气田开发工程]