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The effect of thermal fluid derived from mud diapir on sandstone reservoirs in the Yinggehai Basin, South China Sea

Energy Geoscience 2022年第4期3卷 473-484页

作者： Xiaowei Lv Meiyan Fu Shaonan Zhang Yi Liu Xiaoqi Ding Xianghao Meng Shuai Yin Tengjiao Sun State Key Laboratory of Oil and Gas Geology and Exploitation Chengdu610059China College of Energy Resource Chengdu University of TechnologyChengdu610059China Research Institute of SINOPEC Henan Oilfield Company Zhengzhou450018China College of Geosciences and Technology Southwest Petroleum UniversityChengdu610500China Research Institute of CNOOC Zhanjiang Branch Company Zhanjiang524059China School of Earth Sciences and Engineering of Xian Shiyou University Xian710065China

The underground thermal fluid is one of the significant factors controlling the formation and quality of *** Huangliu Formation(N_(1)h)in YF1 area of the central depression belt in the Yinggehai Basin,South China Sea,is characterized by intense thermal fluid activities related to mud diapir and large-scale shallow-water gravity flow *** multi-episodic invasion of high-temperature and CO_(2)-rich thermal fluid into the formation induces complex water-rock reaction during diagenetic pro-cess,providing a preferable investigation opportunity for revealing how thermal fluid affects reservoir *** study characterizes the reservoirs in the formation through core and thin section analyses as well as physical property *** reservoirs are dominated by fine-grained sandstone characterized by medium porosity(15.2-21.3%)and lower permeability(0.56-15.75mD).Based on an analysis of casting thin section,cathode luminescence(CL),scanning electron microscope(SEM),carbon and oxygen isotope,inclusion test,and electron-probe microanalysis(EPMA),we systematically investigate the diagenetic patterns and pore evolution process for the reservoirs in the *** episodic invasion of thermal fluid occurred approximately 0.4 Ma ago plays an important role in controlling reservoir development:The CO_(2)-rich formation water induces massive late-stage dissolution,resulting in a higher proportion of dissolved pores(38.7-46.4%),which improves the porosity of reservoirs at a depth of 2600-3100 ***,the late dissolution together with carbonate cementation occurred in closed diagenetic system blocks most seepage ***,the relatively high level clay mineral transformation in the YF1 area leads to a higher content of authigenic illite(44-62%)in the *** authigenic illite severely blocks the pore throats in fine sandstone,reducing *** study offers an insight to the understanding of mud diapir-derived thermal fluid

关键词： Thermal fluid sandstone diagenesis CO_(2)dissolution Low permeability Huangliu Formation

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Diagenetic and geochemical studies of the Buchan Formation (Upper Devonian) in the Central North Sea

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Petroleum Science 2018年第2期15卷 211-229页

作者： Long-Xun Tang Jon Gluyas Stuart Jones Leon Bowen Department of Earth Sciences Durham University Department of Physics Durham University

The Upper Devonian Buchan Formation reservoirs in the UK Central North Sea are litharenite/sublitharenite and were deposited in fluvial-aeolian settings. The grain-coating clays in the aeolian sandstones have effectively inhibited quartz overgrowth. Hence, the reduction of reservoir quality is mainly due to mechanical compaction and early dolomite pre- cipitation in both fluvial and aeolian sandstones; quartz overgrowth and kaolinite illitization in fluvial sandstones; and limited smectite illitization in aeolian sandstones. The carbon/oxygen stable isotopes of dolomite cements suggest a predominantly marine carbon source and precipitation temperatures between 25 and 58 ~C indicating a shallow burial depth during dolomite precipitation. The temperatures and the dolomite distribution indicate that the cements originated from the overlying Upper Permian Zechstein carbonates. Extensive quartz overgrowths formed at 80 and 120 ~C in the late and deep diagenetic burial history. The most probable silica source was from feldspar kaolinitization and pressure dissolution of quartz grains. Through detailed petrography and geochemical analyses, the burial-paragenesis-thermal history of the Buchan Formation has been constructed. Similar diagenetic processes are likely to have occurred in the Buchan Formation in other parts of the Central and Northern North Sea. This study may allow new petroleum plays to be considered in areas previously thought to have poor hydrocarbon potential.

关键词： Buchan Formation Upper Devonian Central North Sea sandstone diagenesis Geochemistry methods

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Computerized geochemical modeling of burial diagenesis of the Eocene turbidite reservoir elements：Urucutuca Formation,Espirito Santo Basin,southeastern Brazil passive margin

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Journal of Palaeogeography 2018年第4期7卷 363-377页

作者： Marcos Antonio Klunk Sudipta Dasgupta Rommulo Vieira Conceicao Institute of Isotope Geology Federal University of Rio Grande do SulPorto AlegreBrazil Department of Earth Sciences Indian Institute of Technology (IIT) BombayMumbai India

The computerized geochemical modeling, a useful tool to understand the diagenetic processes influencing the quality of hydrocarbon reservoirs, is performed by using different modules of computer codes based on the thermodynamic and chemical kinetic principles and their associated parameters. As observed in the reservoir lithofacies deposited from the marine sediment-gravity flows, a case study of diagenesis is presented here from the Espírito Santo Basin in southeastern Brazil. The study uses the Geochemist＇s Workbench（GWB～（TM））, PHREEQC～（TM） and TOUGHREACT～（TM） computation packages. The comparison of performances of these packages demonstrates the convergence of results from the software-based geochemical modeling with the petrographic observation of dissolution, albitization, kaolinization, and the precipitation of calcite and dolomite. Moreover, with limited data points, e.g., the sedimentary petrographic data acquired from limited number of boreholes, the computer simulation establishes itself to be a powerful quantitative method estimating the degree and type of diagenetic alteration of turbidite reservoir bodies in contact with a source of saline-water influx associated with salt ***, using the limited petrographic data points, the geochemical computer-simulation method can even be utilized and extrapolated for areas where similar geological context is interpreted but no borehole data are available. Hence, porosity of turbidite reservoir lithofacies can be predicted in relation to the spatial distribution of dissolution, kaolinization, and albitization of feldspars and authigenic carbonate precipitation.

关键词： sandstone diagenesis Computerized diagenetic modeling Turbidite reservoir GWB PHREEQC TOUGHREACT

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