Relative role of accommodation zones in controlling stratal architectural variability and facies distribution: Insights from the Fushan Depression, South China Sea

Liu, Entao; Wang, Hua; Li, Yuan; Leonard, Nicole D.; Feng, Yuexing; Pan, Songqi; Xia, Cunyin

doi:10.1016/j.marpetgeo.2015.08.027

Cited by 31 publications

(31 citation statements)

References 61 publications

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“…Previous studies on accommodation zones have largely focused on large-scale rift basins in the scale of 10s and 100s of kilometres (Coffield, 1987;Morley et al, 1990;Smith et al, 2001). However, accommodation zones can occur at different scales (Fossen and Rotevatn, 2016;Liu et al, 2015;Schlische and Withjack, 2009) and in different regimes and settings, such as in areas of significant salt tectonics (Randles et al, 2012). In this study we follow the definition of Faulds and Varga (1998), who considered accommodation zones as structures that accommodate strain and stress between overlapping normal faults systems, or families.…”

Section: Introductionmentioning

confidence: 99%

The role of gravitational collapse in controlling the evolution of crestal fault systems (Espírito Santo Basin, SE Brazil)

Tao

Alves

2016

Journal of Structural Geology

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A high-quality 3D seismic volume from offshore Espírito Santo Basin (SE Brazil) is used to assess the importance of gravitational collapse in the formation of crestal faults above salt structures. A crestal fault system is imaged in detail using seismic attributes such as curvature and variance, which are later complemented by analyses of throw vs. distance (T-D) and throw vs. depth (T-Z). In the study area, crestal faults comprise closely spaced arrays and are bounded by large listric faults, herein called border faults. Two episodes of growth are identified in two opposite-dipping fault families separated by a transverse accommodation zone. Statistical analyses for eighty-four (84) faults show that fault spacing is < 250 m, with border faults showing the larger throw values. Fault throw varies between 8 ms and 90 ms for crestal faults, and 60-90 ms for border faults. Fault length varies between ~410 m and 1750 m, with border faults ranging from 1250 m to 1750 m. This work shows that border faults accommodated most of the strain associated with salt growth and collapse. The growth history of crestal faults favours an isolated fault propagation model with fault segment linkage associated with the lateral propagation of discrete fault segments. Importantly, two episodes of fault growth are identified as synchronous to two phases of seafloor erosion, rendering local unconformities as competent markers of fault reactivation at a local scale. This paper has crucial implications to the understanding of fault growth histories as a means to assess drilling risk and oil and gas migration on continental margins with important salt tectonics. As a corollary, this work demonstrates that: 1) a certain degree of spatial organization occurs in crestal fault systems; 2) transverse accommodation zones can form regions in which fault propagation is enhanced and where regional dips of faults change in 4D.

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Section: Introductionmentioning

confidence: 99%

The role of gravitational collapse in controlling the evolution of crestal fault systems (Espírito Santo Basin, SE Brazil)

Tao

Alves

2016

Journal of Structural Geology

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“…Braided river deltas. Different from the fan deltas, the braided river deltas exhibited subparallel seismic reflection with progradation in the seismic profiles, which extended further and with a more gentle slope than the fan deltas, and even the inside distributary channel sand body could be recognized ( Figure 6(a)) (Liao et al, 2016;Liu et al, 2015). In the boreholes, the core of the braided river deltas developed tabular cross-bedding and mud pebbles, while the well log presented a smooth bell shape or funnel shape, revealing different microfacies such as the subaqueous distributary channel or subaqueous mouth bar in the braided river delta ( Figure 6 Temporal-spatial evolution of the deltas Temporal evolution among system tracts.…”

Section: Recognition Of Deltasmentioning

confidence: 99%

Characterization and formation mechanism of the basin-marginal deltas in the Paleogene Qiongdongnan Basin, Northwestern South China Sea

Song

Zhang

et al. 2020

Energy Exploration & Exploitation

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In this study, based on seismic profiles, complemented with boreholes and well logs, two types of deltas are recognized in the Paleogene Qiongdongnan Basin, namely fan deltas and braided river deltas, and their temporal–spatial evolution characteristics and associated controlling factors are studied. The results show the following: (1) The base-level cycle and episodic rifting lead that the characteristics of the basin-marginal deltas vary among different system tracts, third-order sequences, and second-order sequences or rifting stages, i.e. the temporal evolution of the basin-marginal deltas. Among the different system tracts in each third-order sequences, the deltas in the lowstand system tracts are vertically thick with small horizontal extension, while those in the transgressive system tracts present retrogradation with limited vertical thickness and horizontal extension, and those in the highstand system tracts turn to present large extension and develop toplap points. Among the different third-order sequences in each rifting stage, the extension of the deltas presents a pattern “small-medium-large” from bottom to top. Among different rifting stages, the deltas also exhibit different characteristics in terms of extension and thickness, and even the type may change. (2) The paleogeomorphology controls the characteristics of the deltas in lateral space, which is mainly reflected by the fact that the gradient of the paleogeomorphology influences the scale and type of the deltas. This study will enhance our understanding of the relative influence of the controlling factors exerted on fan or braided river deltas, and aid in the exploration of the coal-measure source rocks in the Qiongdongnan Basin, which is a typical basin lacking boreholes, located in the South China Sea.

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“…The organic-rich mudstones occurring widely in the Els2 are the major petroleum source rocks in the basin (Li et al, 2008(Li et al, , 2009Wang et al, 2016), the lacustrine facies sandstones and mudstones within Els1 and Els3 are potential reservoirs, and the Ewz fluvial and lacustrine facies formed the most important reservoir rocks in the Fushan Sag Yue, Liu, Ma, & Zhou, 2013). Moreover, the Huachang Transfer Zone has demonstrated unique hydrocarbon accumulation models different from the western and eastern areas, suggesting that the future exploration should be conducted at different levels in the Fushan Depression (Liu et al, 2015). Therefore,…”

Section: Petroleum Systemsmentioning

confidence: 99%

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

et al. 2019

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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.

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Relative role of accommodation zones in controlling stratal architectural variability and facies distribution: Insights from the Fushan Depression, South China Sea

Cited by 31 publications

References 61 publications

The role of gravitational collapse in controlling the evolution of crestal fault systems (Espírito Santo Basin, SE Brazil)

The role of gravitational collapse in controlling the evolution of crestal fault systems (Espírito Santo Basin, SE Brazil)

Characterization and formation mechanism of the basin-marginal deltas in the Paleogene Qiongdongnan Basin, Northwestern South China Sea

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

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