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Jungang Pang | Depositional model of channel & lobe turbidite deposits in lacustrine deep-water fans
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Bouma Virtual Sampler Conference
20-22 April 2022 Day 2 - Fan Building Processes
Jungang Pang | Depositional model of channel and lobe turbidite deposits in lacustrine deep-water fans, Ordos Basin, China
Keywords: channel and lobe turbidite, deep-water fans, Ordos Basin, China
Turbidity current flows are a key process for the delivery of sediment to deep marine and lacustrine environments. Turbidite sandstones form favorable petroleum reservoirs worldwide, commonly in marine successions, but in some cases also in lacustrine successions. Compared to marine environments, the process regime of lacustrine systems differs significantly. The rate, frequency and magnitude of oscillations in lake level may be higher, and water salinity can be considerably lower than in marine settings. As such, the characteristics of lacustrine turbidites may differ from those of their marine counterparts. The recognition of turbidites in different subenvironments of the lacustrine deep-water fan of the Yanchang Formation of the Ordos Basin (China) can guide the establishment of effective criteria with which to aid palaeogeographic restorations and can guide subsurface resource exploration and exploitation.
The Ordos Basin was occupied by a major lake during the late Triassic. The baisn developed in response to the rapid uplift of the Qinling Mountain, driving rapid subsidence in the southern Ordos Basin. The Yanchang Formation, which is composed mainly of fluvial-deltaic-lacustrine strata, is subdivided into 10 Members. Deep-lake turbidites are primarily found in members Ch-7, Ch-6 and Ch-1.
Based on a database of well cores, outcrop observations and well logs, this work examines the sedimentology of the turbidite fan succession of the Yanchang Fm:
(1)A classification scheme of lithofacies and lithofacies associations for lacustrine turbidite fan strata of the Yanchang Formation has been proposed.
(2)Different deep-lake channel and lobe subenvironments have been identified; these are juxtapoised vertically and laterally.
(3)A depositional model of the architecture and evolution of lacustrine turbidite fans of the late Triassic Ordos Basin has been proposed.
20-22 April 2022 Day 2 - Fan Building Processes
Jungang Pang | Depositional model of channel and lobe turbidite deposits in lacustrine deep-water fans, Ordos Basin, China
Keywords: channel and lobe turbidite, deep-water fans, Ordos Basin, China
Turbidity current flows are a key process for the delivery of sediment to deep marine and lacustrine environments. Turbidite sandstones form favorable petroleum reservoirs worldwide, commonly in marine successions, but in some cases also in lacustrine successions. Compared to marine environments, the process regime of lacustrine systems differs significantly. The rate, frequency and magnitude of oscillations in lake level may be higher, and water salinity can be considerably lower than in marine settings. As such, the characteristics of lacustrine turbidites may differ from those of their marine counterparts. The recognition of turbidites in different subenvironments of the lacustrine deep-water fan of the Yanchang Formation of the Ordos Basin (China) can guide the establishment of effective criteria with which to aid palaeogeographic restorations and can guide subsurface resource exploration and exploitation.
The Ordos Basin was occupied by a major lake during the late Triassic. The baisn developed in response to the rapid uplift of the Qinling Mountain, driving rapid subsidence in the southern Ordos Basin. The Yanchang Formation, which is composed mainly of fluvial-deltaic-lacustrine strata, is subdivided into 10 Members. Deep-lake turbidites are primarily found in members Ch-7, Ch-6 and Ch-1.
Based on a database of well cores, outcrop observations and well logs, this work examines the sedimentology of the turbidite fan succession of the Yanchang Fm:
(1)A classification scheme of lithofacies and lithofacies associations for lacustrine turbidite fan strata of the Yanchang Formation has been proposed.
(2)Different deep-lake channel and lobe subenvironments have been identified; these are juxtapoised vertically and laterally.
(3)A depositional model of the architecture and evolution of lacustrine turbidite fans of the late Triassic Ordos Basin has been proposed.
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