We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
准噶尔盆地玛湖凹陷 P—T 转换期层序结构、 坡折发育及油气地质意义.
- Authors
曹正林; 李 攀; 王瑞菊
- Abstract
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 P3w/P2w) and two sets of lowstand deposits, the Upper Wuerhe Formation (P3w) and Baikouquan Formation (T1b) 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.
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 5, p807
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.12.011