Technical Content

Imaging deep targets underneath highly heterogeneous overburden using data from non-ideal acquisition is always challenging. In Block SC38, offshore Philippines, the seismic energy propagation is disrupted by a complex volcanic system in the overburden, leading to washed-out imaging beneath the volcano. The absence of ...

Many fields in the Brazilian pre-salt have been historically imaged with narrow-azimuth towed-streamer (NATS) data and only recently have been surveyed with ocean bottom nodes (OBN). Some cases of time-lapse 4D seismic monitoring are limited to hybrid pairs of data, where a NATS baseline ...

New long-offset, low-frequency (LOLF) OBN acquired using the innovative TPS low-frequency source provides transformational imaging of the subsalt geology in the complex and inboard, minibasin domain of the central Gulf of Mexico (GOM). The role of low-velocity (LV) shale bodies in the deformation, which ...

Inspired by the successes of sparse ocean bottom nodes (OBN) programs in recent years, especially the industry's first long-offset, low-frequency (LOLF) sparse OBN survey using the Tuned Pulse Source (TPS) as the seismic source (Merritt et al., 2024), Viridien acquired Laconia OBN, its vast ...

Elastic full-waveform inversion (EFWI) and high-frequency EFWI Imaging have gained increasing popularity, primarily with ocean bottom node (OBN) data, in areas where strong velocity contrasts and associated elastic effects are present, such as the Gulf of America (GOA). However, when only vintage streamer data ...

In this case study, we present results from the first ocean bottom node (OBN) based 4D imaging at the Liza field, offshore Guyana. With two nominally repeated OBN surveys acquired within less than a year, we initially employed a parallel 3D processing flow to ...

Time-lapse (4D) seismic monitoring generally benefits from a dedicated co-processing where important inconsistencies between vintages are attenuated. We propose a joint formulation for least-squares migration (LSM) that further mitigates effects such as low repeatability and diverse data quality, by constraining the least-squares inversion with ...

Marine sediments are often electrically anisotropic at a scale that affects controlled source electromagnetic (CSEM) data. When the sedimentary sequence is steeply dipping, it is important to model the data using resistivity fields that follow the sedimentary bedding, which is called tilted transverse isotropy ...

In onshore southern Mexico, thick Mesozoic intervals, extensive salt, and over-pressured shale pose significant challenges for seismic imaging. Leveraging newly acquired data with longer offsets, higher fold, and improved low-frequency signal, we adopt a time-lag full-waveform inversion (TLFWI) driven workflow to resolve the complex ...