A double-cycle lake basin formed in extensional to transtensional setting: The Paleogene Nanpu Sag, Bohai Bay Basin, China

Jian-guo, Zhang; Jiang, Zaixing; Gierlowski‐Kordesch, Elizabeth; Xian, Benzhong; Li, Zhenpeng; Wang, Siqi; Wang, Xiabin

doi:10.1016/j.sedgeo.2016.12.006

Cited by 26 publications

(16 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Nanpu Sag is located at the northeastern Huanghua Depression in the north Bohai Bay Basin (Figure 1). [24][25][26][27] The Bohai Bay Basin is a Mesozoic-Cenozoic rift basin which displays a "lazy-Z" pattern. [28][29][30][31] The Nanpu Sag is a typical dustpan-shaped faulted sag ( Figure 1).…”

Section: Geologic Settingsmentioning

confidence: 99%

“…1,30,34,35 The Cenozoic stratigraphic units in the Nanpu Sag include the Eocene Kongdian (Ek), Paleogene Shahejie (Es), Paleogene Dongying (Ed), Miocene Guantao (Ng), Minghuazhen (Nm), and the Quaternary Pingyuan Formation (Qp) ( Figure 1). 25,27,33,36 The Dongying Formation is in unconformable contact with the underlying Shahejie Formation. The lithology of Dongying Formation in Nanpu Sag consists of mudstones, fine to medium-grained sandstones, peppy sandstones, and conglomerates.…”

Section: Geologic Settingsmentioning

confidence: 99%

See 1 more Smart Citation

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Niu

Liu

Lai

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

Fracture detection and in‐situ stress determination via well logs are important for exploration and exploitation of subsurface hydrocarbons. Cores, thin sections, and image logs are used to describe and interpret the subsurface fractures and in‐situ stress in the Paleogene Dongying sandstones in Nanpu Sag, Bohai Bay Basin, China. The maximum horizontal stress (SHmax) indicates a nearly east‐west trend according to the borehole breakouts and drilling‐induced fractures. Natural fractures in the Dongying sandstones are classified into: (1) open fractures and (2) closed fractures. The cement‐filled (closed) fractures are commonly detected by image logs as bright discontinuous sinusoidal waves due to resistive filling materials, while the open fractures are evident on image logs appearing as dark sine waves. The open fractures are of dominantly high dip angles, and the rose diagrams confirm the presences of two sets of fractures: northwest‐southeast and northwest‐southeast orientation. Fractures with strikes approximately parallel to the SHmax have good connectedness, making a significant contribution in hydrocarbon production. In addition, the oil‐bearing layers are mainly associated with the intervals with open fractures. The presence of natural fractures provides important pore spaces and fluid flow conduits. Insights can be provided into the subsurface fracture (natural and induced) detection and characterization using image logs.

show abstract

Section: Geologic Settingsmentioning

confidence: 99%

Section: Geologic Settingsmentioning

confidence: 99%

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Niu

Liu

Lai

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…The Dongying Formation (28.5–23.8 Ma) and the Shahejie Formation (45.5–28.5 Ma) in the Nanpu Sag were deposited during the two main rift phases with non‐marine, lacustrine clastic deposition over 4,000 m thick (Zhang et al, ). The rifting weakened rapidly following the Guantao Formation (23.8–5.32 Ma), which marks the beginning of the post rift with approximately 2,000–3,000 m of alluvial and fluvial depositions (Figure ; J. Hua et al, ; Jia et al, ).…”

Section: Regional Geological Settingmentioning

confidence: 99%

Rift activity and sequence stratigraphy of the Oligocene Dongying Formation in the Nanpu Sag, eastern China: Implications for rift sequence stratigraphy in lacustrine basins

Chen

Zhang

et al. 2019

Geological Journal

View full text Add to dashboard Cite

Rifting plays an important role in accommodation variations in rift basins. However, fluvial discharge as another important factor affecting lacustrine rift sequence stratigraphy is not well explored. In this work, seismic and well data are used to investigate the stratigraphic features, rift activity, and effect of fluvial discharge in the Nanpu Sag, Bohai Bay Basin. The syn‐rift deposition of the Dongying Formation (28.5–23.8 Ma) is divided into four sequences (SQ1, SQ2, SQ3, and SQ4), and the rift‐related subsidence rate along two parallel boundary faults is calculated. The results indicate that the rift activity weakens from SQ1 to SQ4 and that the two parallel boundary faults consist of a total of four fault segments. As the fault segmented, three propagation folds formed intrabasin highs on which the Beipu, Laoyemiao, and Gaoliu outlets developed. Well logs and 3D seismic data show that from SQ1 to SQ3, retrogradational stacking patterns occur in Beipu, Laoyemiao, and the hanging‐wall ramp, while progradational stacking patterns occur in the Gaoliu outlet. In SQ4, the sequence stacking patterns are progradation‐dominated. By evaluating channel erosion and sediment supply, the fluvial discharge can be estimated, and the result indicates that the Gaoliu outlet has the strongest fluvial discharge from SQ1 to SQ3 with strong channel erosion, and in SQ4, the fluvial discharge of each outlet is comparable and relatively low. The high fluvial discharge of the Gaoliu outlet from SQ1 to SQ3 is considered to be the primary reason for the lake level rise in the intervals between the pulses of rift activities. Sequence stacking patterns and depositional trends in our study intervals are not in line with the rift subsidence rate; this indicates that rifting is not the only factor controlling the rift sequence stratigraphy and variations in the accommodation of lacustrine rift basins. While the Gaoliu outlet has predominant fluvial discharge from SQ1 to SQ3, progradational parasequence sets deposit in the Gaoliu outlet. In contrast, the retrogradational parasequence sets occurred in the Beipu outlet, Laoyemiao outlet, and the hanging‐wall ramp. As the fluvial discharge of the Gaoliu outlet decreased in SQ4, the fluvial discharge in each outlet became low, and the stacking patterns were dominated by progradation. Consequently, this research suggests that fluvial discharge is a significant factor controlling the accommodation creation in lacustrine rift basins, and a sequence model which gives a full consideration of fluvial discharge is constructed for lacustrine rift basins.

show abstract

“…The lake-type evolutions in both the Palaeogene Nanpu Sag and the Jiyang Depression of the Bohai Bay Basin, East China have displayed the cyclical processes during the basin evolutions (Zhang et al, 2017;Qi & Yang, 2010 balanced-fill (Ed 3 and Ed 2 strata), and (e) overfilled (Ed 1 strata). Extensional tectonics were responsible for the first through third phases, and then transtensional tectonics controlled the fourth to fifth phases.…”

Section: Fill Characteristics Of Palaeogene Lake Basin In Chinamentioning

confidence: 99%

“…The Jiyang Depression experienced the evolution from fluvial (Ek 2 ) to overfilled (Ek 1 , lower Es 4 ) to balanced-fill (upper Es 4 , lower Es 3 ), and to overfilled (Ed) and fluvial (Ng, Nm) condition (Zhang et al, 2017).…”

Section: Fill Characteristics Of Palaeogene Lake Basin In Chinamentioning

confidence: 99%

Lake‐type controls on sedimentary infill and petroleum source rocks in the Palaeogene Fushan Depression, Beibuwan Basin, South China

et al. 2019

View full text Add to dashboard Cite

The lacustrine Beibuwan Basin contained large petroleum reserves in the northern continental shelf of the South China Sea. Due to the great sedimentologic complexity of the lacustrine basins, a significant financial risk associated with exploration needed to be reduced by specific techniques or significantly increasing knowledge of the lake system. Sedimentary infill, sequence stratigraphy, and organic geochemistry of the Fushan Depression in the Beibuwan Basin were studied, and enhanced our comprehension of the genetic relations between the sediment + water supply rates (climate change) and potential accommodation (tectonic subsidence and inherited topography) change. Here, we report two different lake-type evolution cycles developed in two separated sags in the Fushan Depression, which are characterized by: (a) overfilled, (b) balanced-fill, (c) overfilled, (d) balanced-fill, and (e) overfilled in the Huangtong Sag, and (a) overfilled, (b) balanced-fill, and (c) overfilledin the Bailian Sag and the centre Huachang Transfer Zone. Climate change is the dominant factor in the first three phases of the lake-type evolution in both two sags, and transtensional tectonic setting is the controlling factor in the fourth and fifth phases of the lake-type evolution in the Huangtong Sag. The same lake-type with similar source rock and reservoir properties and observations indicate that these associations of source rock and reservoir play elements occur in a wide variety of tectonic settings. Moreover, the discovery of the cyclical process of the lake-type evolution in the Fushan Depression can be a reference in the study of other similar lacustrine basins under an analogous tectonic and climate background.

show abstract

A double-cycle lake basin formed in extensional to transtensional setting: The Paleogene Nanpu Sag, Bohai Bay Basin, China

Cited by 26 publications

References 51 publications

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Rift activity and sequence stratigraphy of the Oligocene Dongying Formation in the Nanpu Sag, eastern China: Implications for rift sequence stratigraphy in lacustrine basins

Lake‐type controls on sedimentary infill and petroleum source rocks in the Palaeogene Fushan Depression, Beibuwan Basin, South China

Contact Info

Product

Resources

About