摘要
为了桂中沙塘聚煤盆地的大埔背斜开展地下储气库项目选址和地质评价工作,对大埔背斜地层、形态和两翼断裂进行野外调查与室内综合分析。大埔箱状背斜褶皱,转折端平缓宽阔,使得储层三维空间规模相应较大。两翼的走向逆断层没有破坏背斜主体,砂岩储层原始容气率与渗透率低,燕山期强烈的南北向挤压作用,产生剪性节理,平行层理裂缝发育为主要容气构造、垂直层理裂缝较小为次要容气构造,喜马拉雅期差异性升降产生张性节理,连通剪性节理,为导气构造;导致孔隙率小于10%的储层,渗透率达到47.7×10-3μm 2,提升了储层品质;背斜高点虚脱形成气顶甜点区。盖层为泥页岩,矿物成分主要为水云母,极易压实,封闭条件良好。大埔背斜可能属于优质储气构造。
For underground gas storage project siting and geological assessment works in the Dapu anticline,Shatang coal accumulation basin,central Guangxi have carried out field investigation and laboratory synthetic analysis for the anticline’s strata,form and limb faults.The hinge zone of Dapu box anticline is gentle and wide made reservoir 3D space scale accordingly larger.The strike reverse faults in two limbs have not destructed anticline main body.Original gas tolerance rate and permeability of sandstone reservoir are all low.The Yanshanian strong NS compression has caused shear joints,parallel to bedding fractures developed into main gas tolerance structure;vertical to bedding fractures are rather small thus the less important gas tolerance structure.The Himalayan differential elevation and subsidence has caused extension joints and connected shear joints,thus the gas conduction structure,resulted in reservoir with porosity less than 10%,permeability 47.7×10-3μm 2 has improved reservoir quality;anticline top open out formed gas top“dessert area”.Overburden is argillutite,mineral composition mainly hydromica,very easy to be compacted,thus favorable sealing condition.Dapu anticline possibly belongs to high quality gas storage structure.
作者
赵冠华
张福强
张德高
陈健
周立坚
韦梦蝶
潘艳明
梁源
上官云飞
Zhao Guanhua;Zhang Fuqiang;Zhang Degao;Chen Jian;Zhou Lijian;Wei Mengdie;Pan Yanming;Liang Yuan;Shangguan Yunfei(China National Administration of Coal Geology Guangxi Administration of Coal Geology,Nanning,Guangxi 530299;China National Administration of Coal Geology,Beijing,100038;China National Administration of Coal Geology Guangdong Administration of Coal Geology,Guangzhou,510170;No.150 Exploretion Team Guangxi of Coal Geology,Nanning,Guangxi 530299)
出处
《中国煤炭地质》
2020年第12期47-54,共8页
Coal Geology of China
基金
中国煤炭地质总局广西煤炭地质局重点科研项目(201901)
成都理工大学油气藏地质及开发工程国家重点实验室项目(PLC20190407)。
关键词
聚煤盆地
背斜储气构造
地下储气库
天然气储存
桂中沙塘
coal accumulation basin
anticline gas storage structure
underground gas storage
natural gas storage
Shatang,central Guangxi
