Mechanism of Upfault Seepage and Seismic Expression of Hydrocarbon Discharge Sites from the Timor Sea

Langhi, Laurent, Zhang, Yanhua, Gartrell, Anthony, Brincat, Mark P., Lisk, Mark, Underschultz, Jim and Dewhurst, David (2013). Mechanism of Upfault Seepage and Seismic Expression of Hydrocarbon Discharge Sites from the Timor Sea. In Hydrocarbon Seepage: From Source to Surface (pp. 11-41) Tulsa, OK, United States: Society of Exploration Geophysicists. doi:10.1190/1.9781560803119.ch2

Author Langhi, Laurent
Zhang, Yanhua
Gartrell, Anthony
Brincat, Mark P.
Lisk, Mark
Underschultz, Jim
Dewhurst, David
Title of chapter Mechanism of Upfault Seepage and Seismic Expression of Hydrocarbon Discharge Sites from the Timor Sea
Title of book Hydrocarbon Seepage: From Source to Surface
Place of Publication Tulsa, OK, United States
Publisher Society of Exploration Geophysicists
Publication Year 2013
Sub-type Research book chapter (original research)
DOI 10.1190/1.9781560803119.ch2
Open Access Status Not yet assessed
Series Geophysical Developments Series
ISBN 9781560803102
Volume number 16
Chapter number 2
Start page 11
End page 41
Total pages 31
Total chapters 15
Language eng
Abstract/Summary Three-dimensional coupled deformation and fluid-flow numerical modeling, charge-history analysis, and seismic imaging of inferred leakage-related geobodies are integrated to investigate the response of a complex set of Jurassic trap-bounding normal faults to extensional reactivation and to assess hydrocarbon upfault seepage on the Laminaria High (Timor Sea, Australian North West Shelf). Fluid inclusion data are consistent with the presence of paleo-oil columns below the current accumulations in the Laminaria and Corallina fields. Evidence for other partially breached (current and paleo-oil column) as well as breached (dry with paleo-oil column) closures across the region implies that active and widespread seepage took place after the time of initial oil charge. The distribution of current and paleo-oil zones, and the location of inferred hydrocarbon leakage indicators defined on 3D seismic data, correlates with the prediction of fault-seal effectiveness based on modeled strain distribution. Within the geologic framework of the Laminaria High area, this distribution suggests that when sufficient reactivation shear strain is accumulated by reservoir faults, ductile deformation might give way to brittle failure in the top seal, allowing active flow pathways to develop and upfault seepage to take place from the reservoir to thief zones or the seafloor. The observations emphasize that strain and upfault fluid-flow partitioning is constrained by prereactivation fault size, lateral fault-tip distributions, and the presence of fault jogs inherited from successive episodes of growth processes. These elements can explain the complex distribution of paleo- and preserved oil columns in the study area and further support Cenozoic tectonic activity as being the first-order control on trap breaching and hydrocarbon seepage in this region.
Keyword North-West Shelf
Fault Zone Architecture
Eastern Indonesia
Collision Complex
Trap Integrity
Q-Index Code B1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Book Chapter
Collection: Centre for Coal Seam Gas
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