Title:

Fault and Structure Study for Field Development Strategy in Patuha Geothermal Project

Authors:

Vicky CHANDRA, Yuris RAMADHAN, Ihsan AKMALA, Randy ATMAJA, Rhyno SESESEGA, Chevy ISKANDAR

Key Words:

fault, structure, feedzone, well targeting, lidar, permeability, sweet spot, pts, tracer test, meq, gravity, thermal feature, kawah putih, Patuha, geothermal

Conference:

Stanford Geothermal Workshop

Year:

2022

Session:

Geology

Language:

English

Paper Number:

Chandra

File Size:

1942 KB

View File:

Abstract:

Faults and structures are often considered as well targets due to its contribution to the geothermal fluid permeability in the reservoir. There are some similarities among evidence of surficial geothermal faults, fracture, structure, and volcanic features pattern with the occurrence of drilling sweet spots at the subsurface from several experiences in the world. Based on this assumption, an analysis of surface mapping to indicate the coexisting of faults, structures and volcanic features are highly required. Later, these surface structure should be confirmed by subsurface data such as geophysical and well data. The comprehensive approach will be applied as part of well targeting assessment prior to Patuha Geothermal Drilling Campaign Project. The objective of the study is to get a better understanding of the fault and structure pattern of Patuha field and as main component of the well targeting. This study covers the observation from geology regional framework, remote sensing interpretation using LiDAR data, and ground truth mapping for thermal features, and geological structure evidence. Whilst the subsurface data is derived from PTS, Tracer test, MeQ, and Gravity anomaly will be used to support the interpretation. Finally, the surface and subsurface interpretation will be integrated to see the fractures/faults trend continuity to reservoir zone and it will be classified for the confidence level that provide significant input for well targeting and its affected area or known as damage zone. The fault and structures developed in Patuha generally have trend of NNW-SSE coupling with trend NNE-SSW and some minor N-S direction. The faults then have been ranked to indicate the possibility of success with the higher rank of faults are favourable to be targeted. The common trend is NNW-SSE, while the other has the lower rank. The feedzones are distributed approximately at elevation of 1100-1300 masl, 500-800 masl, and 0-150 masl. The correlation of feedzones with the faults also indicate that the distance of affected area or damage zone is around 20 – 250 m and it equivalents with fault dip around 80 – 90 Degree. However, this study concludes there are majorly feedzones that associated with fault and structures, and some faults may not show it conclusive connection


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