High-resolution Sequence Stratigraphy and Implications For Cretaceous Glacioeustasy of the Late Cretaceous Gallup System, New Mexico, U.S.A.

2019 ◽  
Vol 89 (6) ◽  
pp. 552-575 ◽  
Author(s):  
Wen Lin ◽  
Janok P. Bhattacharya ◽  
Andrew Stockford
Keyword(s):  
New Mexico ◽  
High Resolution ◽  
Sequence Stratigraphy ◽  
Late Cretaceous ◽  
High Resolution Sequence Stratigraphy

scholarly journals Sedimentary Characteristics and Lithological Trap Identification of Distant Braided Delta Deposits: A Case on Upper Cretaceous Yogou Formation of Termit Basin, Niger

2018 ◽  
Vol 53 ◽  
pp. 03020
Author(s):  
Zhao Ning ◽  
Gao Xia ◽  
Huang Jiangqin ◽  
Chen Zhongmin ◽  
Zhang Guangya
Keyword(s):  
High Resolution ◽  
Sequence Stratigraphy ◽  
Late Cretaceous ◽  
Deposition Process ◽  
Hydrocarbon Exploration ◽  
Reservoir Quality ◽  
Lateral Migration ◽  
Lateral Connection ◽  
Structure Geometry ◽  
High Resolution Sequence Stratigraphy

Lithological trap identification in thin sand and thick shale layers is still a challenge for hydrocarbon exploration. Based on the high-resolution sequence stratigraphy theory and the establishment of high-resolution sequence stratigraphy framework with seismic-well tie, the dynamic deposition process of braided delta sands on late Cretaceous Yogou formation has been analyzed on 62 wells in passive rifting Termit basin with multi-stages depressions and reversals. (1) Six kinds of sedimentary microfacies and three major reservoir sands with multi-stages vertical stacking and lateral migration are in late Cretaceous; (2) Based on accommodation space/Sediments supply change and depositional progress, sedimentary facies distribution evolution has been done according to sands thickness statistics of sedimentary micro-facies, and narrow-time seismic attributes and slices analysis, multi-sources braided delta depositional model has been concluded; (3) Based on source rock and caprock evaluation, with reservoir sands distribution and faults impact on Yogou formation of Termit basin, four types of traps, including structure-lithology, Structure-strata, stratigraphic and lithology are concluded. Traps influencing factors, i.e., structure geometry, sands distribution, paleotopography, stratigraphy cycling, sand/shale lateral connection, reservoir quality and so on, have different impacts on these traps, and different lithologic-stratigraphy traps have different exploration risks. Structure geometry and sands distribution are very important for the structure-lithology traps; structure geometry and paleotopography are the key factors in Structure-strata traps. Sands distribution and reservoir quality can be focused on lithology traps. Moreover, paleotopography and sand/shale lateral connection are significant on stratigraphic traps. Therefore, different hydrocarbon accumulation types of lithological traps have been established.

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