Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, gamma radiation, velocity, density, borehole images,…) in any hole depends on the scientific objectives and operational constraints.

Canterbury basin covers an approximate area of 40,000 km2, Canterbury basin is largely an offshore basin extending slightly onshore southward across Canterbury plains and to the Southern Alps. This work aimed to correlates seismic sequences boundaries earlier interpreted with sedimentary sequence surfaces observed in cores recovered from the four sites drilled across the shelf by expedition 317. This work utilises well data obtained from Integrated Ocean Drilling Program (IODP) expedition 317. The expedition which targeted stratigraphic seismic sequences earlier interpreted from the seismic data acquired on the eastern margin of the south island of New Zealand (offshore Canterbury). Three synthetic seismograms were created from well U1351B, U1353C and U1352B which both contain sets of sonic and density logs at variable length, this is to provide a direct means of comparison between the sequence boundaries interpreted on seismic and the depth on cores recovered from holes transecting on the seismic profiles. From the interpretation, nineteen boundaries were identified (U1-U19), these boundaries can be broadly divided into two large units. From U19-U11 (the upper units), it’s dominated by downlapped seismic termination pattern along the paleoshelve and truncation surfaces across the shelve edge around site U1351B, a number of channel incisions were observed in this profile. The lower units (from U10-U5) consist of less truncation but more common onlap on paleoshelves, it features more drift deposits with sigmoidal reflection pattern. GJHSS-B Classification: FOR Code: 040399 CorrelationofSequencesandChangesinFaciesacrossShelfMarginusingCoreandSeismicDataOffshoreCanterburyBasin Strictly as per the compliance and regulations of: Publisher: Global Journals Correlation of Sequences and Changes in Facies across Shelf Margin using Core and Seismic Data Offshore Canterbury Basin Kachalla, Aliyuda , Helen Lever , Musa Bappah Usman , Usman Abubakar Ѡ & Abdulwahab Mohammed Bello ¥ AbstractCanterbury basin covers an approximate area of 40,000 km, Canterbury basin is largely an offshore basin extending slightly onshore southward across Canterbury plains and to the Southern Alps. This work aimed to correlates seismic sequences boundaries earlier interpreted with sedimentary sequence surfaces observed in cores recovered from the four sites drilled across the shelf by expedition 317. This work utilises well data obtained from Integrated Ocean Drilling Program (IODP) expedition 317. The expedition which targeted stratigraphic seismic sequences earlier interpreted from the seismic data acquired on the eastern margin of the south island of New Zealand (offshore Canterbury). Three synthetic seismograms were created from well U1351B, U1353C and U1352B which both contain sets of sonic and density logs at variable length, this is to provide a direct means of comparison between the sequence boundaries interpreted on seismic and the depth on cores recovered from holes transecting on the seismic profiles. From the interpretation, nineteen boundaries were identified (U1-U19), these boundaries can be broadly divided into two large units. From U19-U11 (the upper units), it’s dominated by downlapped seismic termination pattern along the paleoshelve and truncation surfaces across the shelve edge around site U1351B, a number of channel incisions were observed in this profile. The lower units (from U10-U5) consist of less truncation but more common onlap on paleoshelves, it features more drift deposits with sigmoidal reflection pattern. The nineteen seismic sequences boundaries correlate perfectly with sharp contacts between sandstone and mud/shale on the core sections, however few are gradational contacts. Canterbury basin covers an approximate area of 40,000 km, Canterbury basin is largely an offshore basin extending slightly onshore southward across Canterbury plains and to the Southern Alps. This work aimed to correlates seismic sequences boundaries earlier interpreted with sedimentary sequence surfaces observed in cores recovered from the four sites drilled across the shelf by expedition 317. This work utilises well data obtained from Integrated Ocean Drilling Program (IODP) expedition 317. The expedition which targeted stratigraphic seismic sequences earlier interpreted from the seismic data acquired on the eastern margin of the south island of New Zealand (offshore Canterbury). Three synthetic seismograms were created from well U1351B, U1353C and U1352B which both contain sets of sonic and density logs at variable length, this is to provide a direct means of comparison between the sequence boundaries interpreted on seismic and the depth on cores recovered from holes transecting on the seismic profiles. From the interpretation, nineteen boundaries were identified (U1-U19), these boundaries can be broadly divided into two large units. From U19-U11 (the upper units), it’s dominated by downlapped seismic termination pattern along the paleoshelve and truncation surfaces across the shelve edge around site U1351B, a number of channel incisions were observed in this profile. The lower units (from U10-U5) consist of less truncation but more common onlap on paleoshelves, it features more drift deposits with sigmoidal reflection pattern. The nineteen seismic sequences boundaries correlate perfectly with sharp contacts between sandstone and mud/shale on the core sections, however few are gradational contacts.

Integrated Ocean Drilling Program (IODP) Expedition 317 was devoted to understanding the relative importance of global sea level (eustasy) versus local tectonic and sedimentary processes in controlling continental margin sedimentary cycles.The expedition recovered sediments from the Eocene to recent period, with a particular focus on the sequence stratigraphy of the late Miocene to recent, when global sea level change was dominated by glacioeustasy.Drilling in the Canterbury Basin, on the eastern margin of the South Island of New Zealand, takes advantage of high rates of Neogene sediment supply, which preserves a high-frequency (0.1-0.5 m.y.) record of depositional cyclicity.Because of its proximity to an uplifting mountain chain (the Southern Alps) and strong ocean currents, the Canterbury Basin provides an opportunity to study the complex interactions between processes responsible for the preserved sequence stratigraphic record.Currents have locally built large, elongate sediment drifts within the prograding Neogene section.These elongate drifts were not drilled during Expedition 317, but currents are inferred to have strongly influenced deposition across the basin, including locations lacking prominent mounded drifts.Upper Miocene to recent sedimentary sequences were cored in a transect of three sites on the continental shelf (landward to basinward, Sites U1353, U1354, and U1351) and one on the continental slope (Site U1352).The transect provides a stratigraphic record of depositional cycles across the shallow-water environment most directly affected by relative sea level change.Lithologic boundaries provisionally correlative with seismic sequence boundaries were identified in cores from each site, providing insight into the origins of seismically resolvable sequences.This record will be used to estimate the timing and amplitude of global sea level change and to document the sedimentary processes that operate during sequence formation.Sites U1353 and U1354 provide significant double-cored, high-recovery sections through the Holocene, allowing for high-resolution study of recent glacial cycles in a continental shelf setting.Continental slope Site U1352 represents a complete section from modern slope terrigenous sediment to hard Eocene limestone, with all the associated lithologic, biostratigraphic, physical, geochemical, and microbiological transitions.This site also provides a record of ocean circulation and fronts during the last ~35 m.y.

The late Eocene to earliest Oligocene sediments between Punakaiki and Westport on the West Coast of the South Island, including the Brunner Coal Measures and the Rapahoe Group, comprise an unconformity-bounded transgressive-regressive sequence. The lower unconformity, below the Brunner Coal Measures, is formed on Cretaceous and Paleozoic granitoids, metamorphic rocks, and the Paleozoic Greenland Group metasediments. The upper bounding unconformity is located below the shoreline Little Totara Sand (a part of the Rapahoe Group) around Cape Foulwind, and between other elements of the Rapahoe Group and the overlying Nile Group limestones south of Charleston. The upper unconformity is usually erosional, and at Woodpecker Bay dissolution of a layer of rhodolithic limestone indicates subaerial exposure of the unconformity surface. An Early Whaingaroan age for the upper unconformity has been obtained at Gibsons Beach: the more southern exposures of the upper unconformity are poorly dated but consistent with this age. No correlative unconformity has been recognised in the Eocene-Oligocene successions at Greymouth and Murchison, but an exposure at Whitecliffs near Inangahua contains an unconformity related to sea-level fall, and of a similar age. Breccia deposition at the Little Wanganui River mouth was initiated in the Early Whaingaroan, and may be causally related to the upper unconformity. The restriction of the upper unconformity to the area north of Punakaiki suggests that a local tectonic event, or tectonic basin controls, may be the cause of the erosion. Global sea-level charts do not suggest a major sea-level fall at this time. Whaingaroan unconformities that are observed in the South Pacific are younger than the age of the upper unconformity. The Brunner Coal Measures - Rapahoe Group sequence (Rapahoe sequence) is an example of a preserved unconformity-bounded transgressive-regressive sequence created by tectonic and/or subsidence controls.