Genesis and maturity identification of oil and gas in the Xihu Sag, East China Sea Basin

Su, Ao; Chen, Honghan; Wang, Cunwu; Li, Peijun; Hui, Zhang; Xiong, Wanlin; Lei, Mingzhu

doi:10.1016/s1876-3804(13)60073-7

Cited by 28 publications

(14 citation statements)

References 9 publications

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“…(Cooper et al, ; Liu et al, ). The Pinghu Formation is the main hydrocarbon source rocks (Shu et al, ; Su et al, ; Zhu, Li, Zhou, & Gu, ) in the Xihu Sag, which have entered into the stage of hydrocabon generation after the sedimentation of the Huagang Formation in the Oligocene. After the Miocene sedimentation, most of the source rocks of the Pinghu Formation entered into the hydrocarbon explusion period.…”

Section: Discussionmentioning

confidence: 99%

“…(Cooper et al, 1989;Liu et al, 2000). The Pinghu Formation is the main hydrocarbon source rocks (Shu et al, 2011;Su et al, 2013;Zhu, Li, Zhou, & Gu, 2012) compressive stress values than the surrounding areas ( Figure 11), which means that they are the low potential region for fluids. Therefore, under the driving force of circumferential compressive stress, the fluid resources are likely to migrate along the pre-existing faults and accumulate there.…”

Section: Influence Of Tectonic Inversion On Oil-gas Accumulation Inmentioning

confidence: 99%

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Dynamic mechanism of tectonic inversion and implications for oil–gas accumulation in the Xihu Sag, East China Sea Shelf Basin: Insights from numerical modelling

Dai

et al. 2017

Geological Journal

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The East China Sea Shelf Basin (ECSSB) lies at the south‐eastern margin of the Eurasian Plate and was affected by the subduction of the Pacific Plate and the Philippine Plate. It experienced and recorded multistage tectonic inversions in the Cenozoic, especially in the Xihu Sag. In an attempt to investigate the evolution and mechanism of tectonic inversion, this paper presents numerical simulation results by the finite element method to the Xihu Sag. Combined with comprehensive structural analyses of seismic profiles, this paper determines the structural geometry of the sag for establishing a viscoelastic geologic model including six‐layer strata and nine major faults. Simulation results show that the boundary conditions of transtension and transpression control the inversion process that propagates from east to west, and the distribution of low compressive stress displays certain correlations with the distribution of oil deposits. Based on quantitative analysis of the vertical displacement field of the Xihu Sag, this paper identifies a tectonic inversion process, which indicates that the western part of the sag uplifts and the eastern part subsides during the first‐stage inversion; whereas the western part subsides and central‐eastern parts uplift during the second and third stages. The formation of the tectonic inversion is controlled by the adjustment of the stress field from dextral transtension to sinistral transpression caused by the change of subduction rates and direction of the Pacific Plate and the Philippine Sea Plate.

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Section: Discussionmentioning

confidence: 99%

Section: Influence Of Tectonic Inversion On Oil-gas Accumulation Inmentioning

confidence: 99%

Dynamic mechanism of tectonic inversion and implications for oil–gas accumulation in the Xihu Sag, East China Sea Shelf Basin: Insights from numerical modelling

Dai

et al. 2017

Geological Journal

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“…Overall, it features a long strip distribution from southwest to northeast. From west to east, the Xihu Sag is composed of the West Slope Group, the Central Inverse Anticline Group and the East Steep Slope Fault-Uplift Group (Zhu et al, 2012;Su et al, 2013) ( Fig. 1).…”

Section: Geological Settingmentioning

confidence: 99%

Facies Architecture Model of the Shimentan Formation Pyroclastic Rocks in the Block‐T Units, Xihu Sag, East China Sea Basin, and its Exploration Significance

Dai

Tang

Zuyi³

et al. 2019

Acta Geologica Sinica (Eng)

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A gas field consisting of volcanic reservoir rocks was discovered in the block-T units of the Xihu Sag, East China Sea Basin. The lithology of the volcanic rocks is dominated by tuff and reworked tuff. The lithofacies are dominated by base surge deposits of explosive facies. As the architecture model of volcanic facies is still uncertain, it has restricted the exploration and development of mineral resources in this area. Using core and cuttings data, the lithology, lithofacies, geochemistry as well as grain size characteristics of volcanic rocks were analyzed. Based on these analyses, the volcanic rocks in the well section are divided into three eruptive stages. The transport direction of each volcanic eruption is analyzed using crystal fragment size analysis. The facies architecture of the block-T units was established based on the reconstruction results of paleo-geomorphology. The results show that the drilling reveals proximal facies (PF) and distal facies (DF) of the volcanic edifices. However, the crater-near crater facies (CNCF) are not revealed. Compared with the reservoirs of the Songliao Basin, it is shown that the volcanic rocks in the Xihu Sag have good exploration potential; a favorable target area is the CNCF near the contemporaneous fault.

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“…1). The Xihu Depression is composed of, from west to east, the West Slope Group, the Central Inverse Anticline Group and the East Steep Slope Fault-Uplift Group (Zhu et al, 2012;Su et al, 2013). The Xihu Depression is composed of, from west to east, the West Slope Group, the Central Inverse Anticline Group and the East Steep Slope Fault-Uplift Group (Zhu et al, 2012;Su et al, 2013).…”

Section: Regional Geological Setting and Basic Datamentioning

confidence: 99%

“…The Xihu Depression is located in the northeastern part of the ECSSB, whose area is about 4.6 × 10 4 km 2 and the Cenozoic maximum sedimentary thickness is > 10 km (Li et al, 2007(Li et al, , 2009Yang et al, 2011). The Xihu Depression is composed of, from west to east, the West Slope Group, the Central Inverse Anticline Group and the East Steep Slope Fault-Uplift Group (Zhu et al, 2012;Su et al, 2013). Local structures in the Xihu Depression are favourable for oil-gas accumulation.…”

Section: Regional Geological Setting and Basic Datamentioning

confidence: 99%

Simulation of oil–gas migration and accumulation in the East China Sea Continental Shelf Basin: a case study from the Xihu Depression

Jiang

Chen

et al. 2016

Geological Journal

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The oil–gas accumulation process is a tectonic indicator, and the oil–gas trap is generally a result of tectonic movement. In order to explore the law of oil–gas migration and accumulation in the East China Sea Continental Shelf Basin, this paper analyses the dynamic process of hydrocarbon accumulation based on a geological model, taking the Xihu Depression as an example and using the IES PetroMod basin modelling software. Combined with the seismic data and drilling data, the burial history, thermal evolution history and hydrocarbon generation, expulsion and migration history of the Xihu Depression is simulated in this study. The simulation results show that (1) the tectonic framework of the Xihu Depression developed as an inversion structure from an early extensional stage or transtensional faulting stage to a later compressional or transpressional inversion stage; (2) the Pinghu and Huagang formations of the Xihu Depression are still currently at the peak stage of oil–gas generation, and the Xihu Depression is a depression which has abundant hydrocarbon generation and expulsion at a later stage; (3) oil–gas resources vertically migrated to the structural highs from the eastern and western sub‐sags along faults and ultimately accumulated in favourable traps, which developed a migration pattern of interbedded sandstone–fault–sandstone like an upward ‘staircase’. In particular, faults and the potential energy state played an important role in hydrocarbon migration of the Xihu Depression, which has a guiding significance for understanding hydrocarbon migration and accumulation law and reducing the risk in oil–gas exploration in the East China Sea Continental Shelf Basin. Copyright © 2016 John Wiley & Sons, Ltd.

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Genesis and maturity identification of oil and gas in the Xihu Sag, East China Sea Basin

Cited by 28 publications

References 9 publications

Dynamic mechanism of tectonic inversion and implications for oil–gas accumulation in the Xihu Sag, East China Sea Shelf Basin: Insights from numerical modelling

Dynamic mechanism of tectonic inversion and implications for oil–gas accumulation in the Xihu Sag, East China Sea Shelf Basin: Insights from numerical modelling

Facies Architecture Model of the Shimentan Formation Pyroclastic Rocks in the Block‐T Units, Xihu Sag, East China Sea Basin, and its Exploration Significance

Simulation of oil–gas migration and accumulation in the East China Sea Continental Shelf Basin: a case study from the Xihu Depression

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