Sequence architecture, slope-break development and hydrocarbon implications of the Mahu Sag during the P-T transition, Junggar Basin
Received date: 2021-09-07
Revised date: 2022-01-06
Online published: 2022-05-12
Supported by
The China National Science and Technology Major Project of the 13th Five-Year(2017ZX05001001-007)
the Frontier and Fundamental Major Science and Technology Project for 14th Five-Year(2021DJ0404)
Corresponding to the transitional period of the earth system from Late Permian to Early Triassic times (referred to as the P-T transition period), the Mahu Sag of the Junggar Basin experienced a transition from a foreland basin to a large depression lake basin, with the development of two sets of unconformities(T1/P and P3 w/P2 w) and two sets of lowstand deposits, the Upper Wuerhe Formation (P3 w) and Baikouquan Formation (T1 b) that host a series of large or giant conglomerate oil fields. For the two third-order sequence boundaries T1/P and P3/P2, two types of slope-break zones which are associated with flexure or erosion have been identified: flexural slope-break zone is controlled by a persistent paleo-uplift and controls the layer-by-layer “unidirectional onlapping” of the strata above the sequence boundary towards the higher part of the slope; while erosional slope-break zone is controlled by the erosional remnant of plaeo-mounds. It is typically characterized by “two-way onlapping” towards the residual mounds or filling along the lower part of the valleys. The two types of slope-break zones both control changes in stratigraphy and sedimentation, and are conducive to the formation of lithostratigraphic traps of up-dip onlapping, lowstand filling and truncated types. The research results are of great significance to guide the exploration of large-scale lithostratigraphic plays under the control of paleotopography.
Zhenglin CAO , Pan LI , Ruiju WANG . Sequence architecture, slope-break development and hydrocarbon implications of the Mahu Sag during the P-T transition, Junggar Basin[J]. Natural Gas Geoscience, 2022 , 33(5) : 807 -819 . DOI: 10.11764/j.issn.1672-1926.2021.12.011
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