Subsidence: Causes, Effects, and Mitigations in Geothermal Field

5th ITB International Geothermal Workshop

Sektiawan, Akta^1 ; Prasetyo, Ganung Adi^2 ; Adli, Dida Patera^3 ; Yuantoro, Ethis^3

Petroleum Engineering Department, Institut Teknologi Bandung, Bandung, Indonesia^1

Geophysical Engineering Department, Institut Teknologi Bandung, Bandung, Indonesia^2

Geological Engineering Department, Institut Teknologi Bandung, Bandung, Indonesia^3

关键词: Devastating effects;    Fluid volumes;    Ground surfaces;    Oil and Gas Industry;    Overburden pressures;    Pressure stability;    Survey methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/42/1/012022/pdf
DOI  :  10.1088/1755-1315/42/1/012022

来源: IOP

【 摘 要 】

Subsidence is the motion of the ground surface as it moves down relatively. It can occur in a wide range of area. It is an impact of production of large mass and volume of saturation from the reservoir. It doesn't happen especially in geothermal fields only, but also in oil and gas industry. Large fluid volume production leads to the decrease of pore pressure inside reservoir. This decline disturbs the pressure stability and overburden pressure compress the pores. It results the drop in ground surface. The decrease in ground surface level induces a devastating effect in the construction of some facilities, such as building, pipeline, canal, and river. It may interrupt the balance in the ecosystems nearby. Good management and several survey methods (such as levelling and gravity) will reduce the risk of subsidence and the other effects related to it. This discussion output can be used as a guide for minimizing subsidence impact in the geothermal field in general.