Xiaolong Sun

Xijing Hospital

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Enrique Gomez‐Rivas

Universitat de Barcelona

Anna Travé

Universitat de Barcelona

Juan Alcalde

Geociencias Barcelona

Cunfei Ma

China University of Petroleum, East China

David Cruset

Geociencias Barcelona

Chunmei Dong

Sichuan University

Juan Diego Martín‐Martín

Universitat de Barcelona

Guoqiang Luan

China University of Petroleum, East China

Chengyan Lin

China University of Petroleum, East China

Derek Elsworth

Pennsylvania State University

Cooperative Institutions

China University of Petroleum, East China

Universitat de Barcelona

China University of Petroleum, Beijing

Geociencias Barcelona

China University of Geosciences (Beijing)

Consejo Superior de Investigaciones Científicas

China National Petroleum Corporation (China)

Qingdao National Laboratory for Marine Science and Technology

Oil and Gas Center

University of Edinburgh

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Frequency Analyzing Based Hydrocarbon Prospects Characterization of Palaeogene High Amplitude Seismic Anomalies in Bohai Oilfield

Xiaomin Xie Kunyu Wu Y. Wang Y. Liu Xiaolong Sun

Summary High amplitude seismic anomalies are found to be commonly distributed within Paleogene strata in Liaodong Depression, Bohai Oilfield, which may be associated with the presence of hydrocarbon. In this paper, we have attempted to reveal the formation mechanism and then characterize the hydrocarbon prospects as well as spatial distribution of such bright spots. The research starts by rock physics analyzing of the drilled wells and forward modeling, which shows that gas sand with relatively low impedance and gravel sand with relatively high impedance both manifest as strong amplitude reflections. However, spectrum analysis demonstrates the differences between them in dominant frequency and bandwidth, and the result is further confirmed by spectral decomposition. The hydrocarbon-associated seismic anomalies are therefore distinguished from those "false bright spots" caused by other geologic factors through low-pass filtering based peak energy sum, which is then followed by frequency attenuation gradient (FAG) analysis for more accurate distribution of favorable areas and further risk mitigation.

Paleogene

10.3997/2214-4609.202012056

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Quantitative Relationship Between Argillaceous Caprock Thickness and Maximum Sealed Hydrocarbon Column Height

Natural Resources Research (2019)

Cunfei Ma Chengyan Lin Chunmei Dong Guoqiang Luan Yu Zhang

Caprock

Overpressure

Capillary pressure

10.1007/s11053-019-09554-w

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Citations (9)

Effects of fluvial sedimentary heterogeneity on CO2 geological storage: Integrating storage capacity, injectivity, distribution and CO2 phases

Journal of Hydrology (2022)

Xiaolong Sun Yingchang Cao Keyu Liu Juan Alcalde Patricia Cabello

Caprock

Storage efficiency

10.1016/j.jhydrol.2022.128936

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Citations (15)

Fluvial sedimentation and its reservoir potential at foreland basin margins: A case study of the Puig-reig anticline (South-eastern Pyrenees)

Sedimentary Geology (2021)

Xiaolong Sun Juan Alcalde Enrique Gomez‐Rivas Amanda Owen Albert Griera

Fluvial fans represent one of the dominant sedimentary systems at the active margins of non-marine foreland basins. The Puig-reig anticline at the north-eastern margin of the Ebro Foreland Basin (SE Pyrenees, Spain) exposes continuous outcrops of Late Eocene-Early Oligocene fluvial deposits, from proximal to medial fluvial fan environments. The proximal deposits are found in the north limb of the anticline, especially in the northwest zone. These deposits are characterised by conglomerates with minor interbedded sandstones, with thick and wide sheet-like geometries with unscoured or variably scoured basal surfaces. These are interpreted to be the deposits of unconfined flash floods and wide-shallow channel streams. The medial deposits, covering the rest of the anticline, consist of interbedded conglomerates, sandstones and claystones. These are interpreted to have been deposited from braided to meandering channel streams and overbank areas. Distal deposits are found towards the south, beyond the anticline, and are characterised by sandstone and clay deposits of terminal lobes and lacustrine deltas. This study assesses the impact of the primary depositional characteristics, diagenesis and deformation of the most heterolithic portion of the system, with implications for increasing our understanding of folded fluvial reservoirs. Diagenetic processes, mainly mechanical compaction and calcite cementation, resulted in overall low intergranular porosity, with limited relatively high porosity developed in sandstone lithofacies in the medial deposits. Deformation associated with thrusting and fold growth resulted in the formation of abundant fractures, with relatively high fracture intensities observed in sandstone lithofacies in the anticline crest. This study shows that post-depositional processes can both improve and diminish the reservoir potential of basin proximal fluvial deposits, through the development of fracture networks and by compaction-cementation. The comparison of the Puig-reig anticline with other similar settings worldwide indicates that foreland basin margin locations may be potential areas for effective reservoirs, even in the case of low intergranular porosity.

Anticline

Arenite

Syncline

Outcrop

10.1016/j.sedgeo.2021.105993

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Citations (10)

Fractal characteristics of pore networks and sealing capacity of Ordovician carbonate cap rocks: A case study based on outcrop analogues from the Tarim Basin, China

AAPG Bulletin (2021)

Jun Wu Tailiang Fan Enrique Gomez‐Rivas Anna Travé Zhiqian Gao

structure types not only show good correlations (either exponential or linear) with certain fractal dimensions, but they also demonstrate a strong positive correlation with the average fractal dimension.These results suggest that the sealing capacity of the studied rocks increases with increasing fractal dimension.The sealing performance of cap rocks significantly decreases with increasing the amount of macropores.This work provides a relevant case study for further understanding of pore structures and sealing capacity of carbonate cap rocks.

Tarim basin

Outcrop

10.1306/03172019022

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Citations (9)

Origin and distribution of calcite cements in a folded fluvial succession: The Puig‐reig anticline (south‐eastern Pyrenees)

Sedimentology (2022)

Xiaolong Sun Enrique Gomez‐Rivas David Cruset Juan Alcalde Daniel Muñoz‐López

Abstract As one of the predominant diagenetic products in clastic rocks, calcite cements are typical fingerprints of cement‐forming fluids and are key controls on reservoir quality. The Puig‐reig anticline, in the south‐eastern Pyrenees (Spain), exposes excellent outcrops of conglomerates, sandstones and claystones, which were deposited from a proximal to medial fluvial system and underwent folding, fracturing and cementation. This anticline constitutes an appropriate case study to investigate the origin and distribution of calcite cements during folding evolution and how they affect reservoir quality. Based on structural, petrographic and geochemical analyses (carbon, oxygen, strontium and clumped isotopes and elemental composition), five generations of calcite cements (‘Cc0’ to ‘Cc4’) have been identified, filling intergranular porosity of host rocks, faults and four fracture sets (F1 to F4). Calcite cement Cc0 precipitated in intergranular porosity from meteoric fluids in the phreatic zone during the early diagenetic stage. During the most intense phase of thrusting and folding, Cc1 precipitated in intergranular porosity, faults and F1 to F4 fracture sets from hydrothermal fluids that migrated from deeper areas of the Pyrenean chain. During the late stage of fold growth, Cc2 precipitated in faults and their associated fractures in the anticline crest from hydrothermal fluids but at shallower burial depths than that of Cc1. Calcite cement Cc3 mainly precipitated in fractures with the same strike as F1 and F4 fracture sets in the north‐western part of the anticline, from formation fluids that probably migrated through the frontal thrust of the south‐eastern Pyrenees. During the continuous fold denudation, Cc4 precipitated from meteoric fluids in F1 to F4 fracture sets across the anticline. Results indicate that at foreland basin margins, external fluids coeval with compressional deformation and/or alteration of detrital carbonates contribute to intensive calcite cementation. This can result in an overall occlusion of porosity and significantly damaged reservoir quality.

Anticline

Cementation (geology)

Denudation

Ankerite

10.1111/sed.12994

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Citations (11)

Influencing factors and fracability of lacustrine shale oil reservoirs

Marine and Petroleum Geology (2019)

Cunfei Ma Chunmei Dong Chengyan Lin Derek Elsworth Guoqiang Luan

Lithology

Carbonate minerals

10.1016/j.marpetgeo.2019.07.002

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Citations (25)

Corrigendum to “Influencing factors and fracability of lacustrine shale oil reservoirs” [Mar. Petrol. Geology 110 (2019) 463–471]

Marine and Petroleum Geology (2020)

Cunfei Ma Chunmei Dong Chengyan Lin Derek Elsworth Guoqiang Luan

10.1016/j.marpetgeo.2020.104861

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Citations (1)

Hubs and clusters approach to unlock the development of carbon capture and storage – Case study in Spain

Applied Energy (2021)

Xiaolong Sun Juan Alcalde M. Bakhtbidar Javier Elío Víctor Vilarrasa

Many countries have assigned an indispensable role for carbon capture and storage (CCS) in their national climate change mitigation pathways. However, CCS deployment has stalled in most countries with only limited commercial projects realised mainly in hydrocarbon-rich countries for enhanced oil recovery. If the Paris Agreement is to be met, then this progress must be replicated widely, including hydrocarbon-limited countries. In this study, we present a novel source-to-sink assessment methodology based on a hubs and clusters approach to identify favourable regions for CCS deployment and attract renewed public and political interest in viable deployment pathways. Here, we apply this methodology to Spain, where fifteen emission hubs from both the power and the hard-to-abate industrial sectors are identified as potential CO2 sources. A priority storage structure and two reserves for each hub are selected based on screening and ranking processes using a multi-criteria decision-making method. The priority source-to-sink clusters are identified indicating four potential development regions, with the North-Western and North-Eastern Spain recognised as priority regions due to resilience provided by different types of CO2 sources and geological structures. Up to 68.7 Mt CO2 per year, comprising around 21% of Spanish emissions can be connected to clusters linked to feasible storage. CCS, especially in the hard-to-abate sector, and in combination with other low-carbon energies (e.g., blue hydrogen and bioenergy), remains a significant and unavoidable contributor to the Paris Agreement’s mid-century net-zero target. This study shows that the hubs and clusters approach can facilitate CCS deployment in Spain and other hydrocarbon-limited countries.

Sink (geography)

10.1016/j.apenergy.2021.117418

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Citations (71)

Hydrochemical Characteristics of Groundwater at the Epicenter of the 2021 Biru M6.1 Earthquake in Central Tibet

Water (2021)

Pengtao Yang Xiaolong Sun Dongying Liu Zhongtai He Yongsheng Li

Groundwater is undoubtedly important for water security and eco-environmental protection, especially in areas that experience earthquakes. Analyzing the characteristics and variation of groundwater after an earthquake is significant to obtain a better understanding of the seismic risk and rational management of groundwater resources. This study investigated the hydrogeochemical characteristics of groundwater at the epicenter of the 2021 Biru M6.1 earthquake in central Tibet, southwest China, using 23 water samples. The results showed that: (1) the hydrochemical type, hydrogen and oxygen isotope ratios, and SiO2 concentrations of three hot spring water samples in the study area were significantly different from those of samples taken elsewhere, indicating that the hot spring water originates from deeper geothermal reservoirs and has undergone more distant migration and longer fractionation processes; (2) the geochemical characteristics of groundwater from some sampling sites in the epicentral area were apparently distinct from those of other shallow groundwater or surface water samples, suggesting that the groundwater environment in the epicentral area has been affected by the earthquake. Along with the macroscopic groundwater responses in the epicentral area after the earthquake, we investigated the influencing mechanisms of the earthquake on the regional groundwater environment. We conclude that a shorter distance from the epicenter to the seismogenic fault leads to a greater possibility of the generation of new fractures, which then induce macroscopic responses and chemical characteristic variations for groundwater.

Epicenter

10.3390/w13213111

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Citations (2)