Seismic stratigraphy, formation history and gas potential of the Nadym–Pur interfluve area (West Siberia)

Abstract

The study presents a seismic and geological characterization of the Meso-Cenozoic sedimentary cover of the Nadym–Pur interfluve area and discusses the morphology of the Jurassic and Aptian–Albian–Cenomanian sedimentary complexes, formation history of structures, and geologic processes responsible for the formation of Cenomanian gas accumulations.

Morphotectonic and petrological characteristics of Permo-Triassic traps of Siberia

“…The problems of PTTS genesis were solved based on the analysis of satellite images and geological maps. The PTTS manifestation areas, the geology of which is illustrated in Figure 1, demonstrate the coincidence of morphological structures of the WSP basement overlapped by sedimentary rocks with the basement structures in the WSP and Kara Sea petroleum basins (Figure 2) [48][49][50][51][52][53]. Morphological structures characteristics of the PTTS volcanic formations do not significantly differ in areas covered by Meso-Cenozoic sediments (Figure 1), which is confirmed by data on the thickness of the sedimentary rocks in the petroleum basin (Figure 3) [48].…”

“…A comparison shows the correspondence of position and dimensions of magma formations to magnetic and gravitational anomalies (Figures 4 and 5). Correlation with the relief of the basic horizons of Mesozoic sediments in petroleum basins [17,[48][49][50][51]53] demonstrates the consistency of the main morphological structural elements of the crystalline basement of petroleum basins on the PTTS manifestation territory and morphological characteristics of magnetic and gravitational anomalies.…”

Geodynamics and Oil and Gas Potential of the Yenisei-Khatanga Basin (Polar Siberia)

“…Its sections have been penetrated on the Zimnii, Gol'chikha, Vladimir, and Nizhnyaya Kheta fields, and some others (Figure 4). The base of the Tampey Group is associated with the "A" reflector ( Figures 11 and 12), and the top of the Group-with the "Ia (III)" reflector [77][78][79]. The Lower-Middle Triassic lagoonal, deltaic, shore-, shallow-, and deep-marine conglomerates, sandstones, siltstones and mudstones of the Pronchishev, Angardam, and Tuorakhayata groups are concentrated in the eastern part of the basin [80].…”

Tectonic evolution of the Arctic onshore and offshore regions of the West Siberian petroleum province

“…In the West Siberian petroleum province, the Paleozoic, Triassic, Jurassic, Neocomian (Berriasian-Lower Aptian) and Aptian-Albian-Cenomanian seismic megasequences (Kontorovich, 2009;Kontorovich et al, 2001Kontorovich et al, , 2016, corresponding in their stratigraphic volume to the respective petroleum-bearing sedimentary megacomplexes (Kazarinov, 1958(Kazarinov, , 1963 have been traditionally recognized on seismic time sections. Areally extensive sequences of shales with anomalously low acoustic properties forming regional top seals of these megasequences can readily be tied to continuous and highly energetic reflectors that are be traced over much of the West Siberian basin (Table 1).…”

“…Medvezh'e-type structures (type IV) are classified as rootless uplifts, i.e., not associated with large basement inliers, which formed during post-Cenomanian times as a result of Cenozoic tectonic movements (Kontorovich et al, 2016).…”