The Lekhwair High Area is one of the most important hydrocarbon producers in north Oman. It is situated in the northeastern part of the PDO's concession area, close to the borders with the United Arab Emirates and Saudi Arabia. Structurally, it is an uplifted zone located in the foreland of the Oman Mountains. The main regional tectonic events during the Mesozoic to Cenozoic are represented by two stages of deformation. The Late Cretaceous, "Alpine 1" phase, characterized by an overall transtrensional regime forming NNW/SSE and WNW/ESE-oriented faults developed under a NW/SE-direction of maximum horizontal compression. This phase occurred in association with two ophiolite obductions (Semail and Masirah ophiolites). The Eocene "Alpine 2" phase is characterized by a NE/SW-directed transpressional to compressional regime. This phase is associated with the continental collision of Arabia and Eurasia and the formation of the Zagros Fold-and-thrust belt as well as the uplift of the Oman Mountains. The Triassic-Jurassic structures in the Lekhwair Area were previously poorly detected and very challenging to identify because of the covering of Cenozoic rocks. Hence, these structures were previously only studied by low-quality seismic data. Petroleum Development Oman (PDO) recently acquired high-resolution 3D seismic data from northern Oman. The new data enable the investigation and observation of syn/post-Mesozoic subtle structures. This study aims to get a better structural characterization of Triassic and Jurassic intervals in the Lekhwair High Area and support the understanding of the structural/geodynamic evolution of the Early to Mid-Mesozoic intervals as a grounding for the overlying Cretaceous reservoirs. I have observed different fault sets in the study area. (1) NE/SW-oriented reverse faults developed under NW/SE compression (Alpine 0 compression) during the Late Cretaceous. The compression caused a local inversion of the pre-existing NE/SW Jurassic extensional faults and initiation of compressional folds in the Cretaceous overburden. The Cretaceous stress field was characterized by a horizontal, NW-SE shortening direction (σ1 = σHmax) and a vertical direction of the minimum stress component (σ3 = σV). During this period, the kinematic setting of the Indian Plate with regards to the Arabian Plate became inverted. The southeast-ward directed movement of the Indian Plate during the Early Jurassic (170 to 150 vi Ma) was followed by northwest-ward motion with anticlockwise rotation of the Indian Plate during the Late Cretaceous. (2) A NNW-SSE and WNW-SE conjugate fault set that developed as a transtensional fault pattern resulting from the first stage of Alpine deformation which occurred during the Late Cretaceous. This period was associated with two ophiolite obduction stages (Semail and Masirah ophiolites). The stress field is characterised by a maximum vertically stress orientation (σ1 = σV) and a NW-SE- directed shortening. The conjugate faults forming WNW alignments with a left-stepping arrangement (dextral strike slip tendency) and NNW alignments with a right-stepping arrangement (sinistral stike-slip tendency), respectively. The "Alpine 1" deformation phase persisted until the Early Palaeocene (65 Ma).