Structural evolution of horst and half-graben structures proximal to a transtensional fault system determined using 3D seismic data from the Shipwreck Trough, offshore Otway Basin, Australia

Robson, Alexander; Holford, Simon; King, Robert G.; Kulikowski, David

doi:10.1016/j.marpetgeo.2017.10.028

Cited by 21 publications

(3 citation statements)

References 29 publications

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“…Tectonism in the petroliferous basin not only controls the forming of the basin, but also has close connection with the oil and gas accumulation process (Robson et al 2018;Feng and Ye 2018;Nabavi et al 2019;Acharyyaa and Saha 2018;Shabeer et al 2018;Teng et al 2017).…”

Section: Discussionmentioning

confidence: 99%

“…In the Cretaceous, due to the effect of shift and rotation of the Indian plate, the tectonic stress was mainly stretched and tensional in east-westward direction with dextral strike-slip shear characteristics and the transtensional faults were well developed, trending from northwest to southeast (Figure 3). In all, the Cretaceous fault system in the S Block is well developed, and the fault contact relationship is complex (Robson et al 2018;Feng et al 2018;Nabavi et al 2019;Acharyyaa and Saha 2018;Shabeer et al 2018;Teng et al 2017). From the latest seismic interpretation result and based on a series of fault factors, such as fault strike, fault throw, fault extension length and its cutting relation to stratum, the fault system is divided into three types: Type I (main faults), Type II (secondary faults) and Type III (interlayer small faults) (Table 1).…”

Section: Fault Classification and Characteristicsmentioning

confidence: 99%

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Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

DONG,

SATTI,

HERMANA

et al. 2021

Turkish J Earth Sci

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Transtensional faults are well developed in the S Block of the South Asia area, which have an important impact on the hydrocarbon accumulation. However, the transtensional fault structure is very complex. Based on drilling and seismic data interpretation results, faults are divided into three typical types in the Lower Cretaceous, which can help to understand the complex fault system. The main faults are distributed in the NNW-SSE direction and parallel arrangement with dextral strikeslip shear characteristics, which determines the development of the tectonic belt. The secondary faults are often associated with the main faults, often composed of multiple branch faults. The complexity of the fault system is further aggravated by the small interlayer faults. Based on balanced cross-section technique analysis, the fault evolution has experienced five geological periods, which is closely related to the Indo-Pakistan plate tectonics and the Indus Basin evolution. In the diagonal extension stage of the Late Cretaceous, the fault activity was very strong, which had a significant impact on the tectonic pattern of "horst-graben structures and locally complex faulted blocks" in S Block. It is found that transtensional fault assemblage patterns are regular and diverse. It consists of six kinds of plane assemblage and seven kinds of profile assemblage patterns. Plane assemblage patterns include en-echelon, broom, feather, comb, horsetail and diamond shape, while profile assemblage patterns consist of horst-graben faulted type, consequent faulted type, antithetic faulted type, "Y" and reverse "Y" type, "X" type and negative flower type. Different transtensional fault assemblage patterns form various kinds of hydrocarbon trap types, including faulted block, faulted nose, faulted anticline and composite traps. Fault activity and evolution promote the hydrocarbon generation, control the formation of tectonic zones and favorable traps and play an important control role in hydrocarbon migration and accumulation. Therefore, in this study the main exploration and evaluation targets are faulted reservoirs in the study area.

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Section: Discussionmentioning

confidence: 99%

Section: Fault Classification and Characteristicsmentioning

confidence: 99%

Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

DONG,

SATTI,

HERMANA

et al. 2021

Turkish J Earth Sci

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“…; Ortiz‐Karpf, Hodgson and Jackson ; Robson et al . ). However, as seismic data are acquired in the time domain, an accurate time‐to‐depth conversion is required.…”

Section: Introductionmentioning

confidence: 97%

An automated cross‐validation method to assess seismic time‐to‐depth conversion accuracy: a case study on the Cooper and Eromanga basins, Australia

Kulikowski

Hochwald²,

Amrouch

2018

Geophysical Prospecting

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Selecting a seismic time‐to‐depth conversion method can be a subjective choice that is made by geophysicists, and is particularly difficult if the accuracy of these methods is unknown. This study presents an automated statistical approach for assessing seismic time‐to‐depth conversion accuracy by integrating the cross‐validation method with four commonly used seismic time‐to‐depth conversion methods. To showcase this automated approach, we use a regional dataset from the Cooper and Eromanga basins, Australia, consisting of 13 three‐dimensional (3D) seismic surveys, 73 two‐way‐time surface grids and 729 wells. Approximately 10,000 error values (predicted depth vs. measured well depth) and associated variables were calculated. The average velocity method was the most accurate overall (7.6 m mean error); however, the most accurate method and the expected error changed by several metres depending on the combination and value of the most significant variables. Cluster analysis tested the significance of the associated variables to find that the seismic survey location (potentially related to local geology (i.e. sedimentology, structural geology, cementation, pore pressure, etc.), processing workflow, or seismic vintage), formation (potentially associated with reduced signal‐to‐noise with increasing depth or the changes in lithology), distance to the nearest well control, and the spatial location of the predicted well relative to the existing well data envelope had the largest impact on accuracy. Importantly, the effect of these significant variables on accuracy were found to be more important than choosing between the four methods, highlighting the importance of better understanding seismic time‐to‐depth conversions, which can be achieved by applying this automated cross‐validation method.

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Reactivation of a trap-boundary fault and its impacts on hydrocarbon migration and accumulation in Longkou 7 − 6 structure, Bohai Bay Basin: insights from geology, geophysics and basin modeling

Yan,

Wang,

Wang

et al. 2024

J Petrol Explor Prod Technol

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Structural evolution of horst and half-graben structures proximal to a transtensional fault system determined using 3D seismic data from the Shipwreck Trough, offshore Otway Basin, Australia

Cited by 21 publications

References 29 publications

Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

Structural characteristics of transtensional fault system and its implication for hydrocarbon accumulation in S Block, South Asia area

An automated cross‐validation method to assess seismic time‐to‐depth conversion accuracy: a case study on the Cooper and Eromanga basins, Australia

Reactivation of a trap-boundary fault and its impacts on hydrocarbon migration and accumulation in Longkou 7 − 6 structure, Bohai Bay Basin: insights from geology, geophysics and basin modeling

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