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논문 기본 정보

자료유형
학술저널
저자정보
Yancong Jia (China University of Geosciences) Yingchang Cao (China University of Petroleum) Changsong Lin (China University of Geosciences) Jian Wang (China University of Petroleum)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.22 No.1
발행연도
2018.1
수록면
91 - 103 (13page)

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Petrographic analysis combined with thin section observation, fluid inclusions, burial history analysis, and core porosity and permeability, were used to determine diagenetic evolution and its effect on reservoir-quality of beach-bar sandstone reservoirs of Eocene Es4s interval in the Boxing sag, Bohai Bay Basin. Diagenesis is mainly characterized by strong compaction, undercompaction, cementation of carbonate, quartz, pyrite and clay minerals, dissolution of detrital grains and carbonate cements, lime-mud matrix recrystallization and hydrocarbon filling. Paragenetic sequence is determined as “early compaction / precipitation of calcite, dolomite and framboidal pyrite → dissolution of feldspar grains and early-formed carbonate cements/precipitation of quartz → hydrocarbon filling → precipitation of ferroan calcite and ankerite/lime-mud matrix recrystallization → dissolution of ferroan carbonate cements”. In the same diagenetic environment, diagenetic processes for different lithofacies significantly varied and subsequently resulted in great heterogeneity for reservoir quality during progressive burial. Lithofacies for both bar body and beach edge subfacies which are far from sandstone-mudstone contacts, are well sorted and have a strong ability to resist compaction. Abundant primary and secondary porosities are well developed because of modifications by acidic dissolution and hydrocarbon filling. The present physical properties are relatively well and numerous oil beds are developed through shallow to deep burial depth. Lithofacies for both bar body and beach edge subfacies which are adjacent to sandstone-mudstone contacts, are typically characterized by extensive cementation of calcite and dolomite. The present physical properties are bad and dry beds are extensively developed for sandstone reservoirs in both bar body and beach edge subfacies which are adjacent to sandstone-mudstone contacts. Lithofacies for both bar edge and beach mat subfacies were deposited in weak hydrodynamic conditions with high contents of limemud matrix. The reservoir porosity decreases continually due to strong compaction and weak dissolution. The present physical properties are extremely poor and dry beds are commonly developed through shallow to deep burial except for minor oil beds developed in the shallow burial.

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참고문헌 (39)

참고문헌 신청
Ajdukiewicz, J.M. / 2010 / Sandstone reservoir quality prediction: The state of the art / American Association of Petroleum Geologists Bulletin 94:1083~1091 Crossref Ajdukiewicz, J.M. / 2010 / Prediction of deep reservoir quality using early diagenetic process models in the Jurassic Norphlet Formation, Gulf of Mexico / American Association of Petroleum Geologists Bulletin 94:1189~1227 Crossref Altree-Williams A. / 2015 / Textural and compositional complexities resulting from coupled dissolutionreprecipitation reactions in geomaterials / Earth-Science Reviews 150:628~651 Crossref Bjorlykke, K. / 2014 / Relationships between depositional environments, burial history and rock properties. Some principal aspects of diagenetic process in sedimentary basins / Sedimentary Geology 301:1~14 Crossref Bjorlykke, K. / 2012 / Open or closed geochemical systems during diagenesis in sedimentary basins: Constraints on mass transfer during diagenesis and the prediction of porosity in sandstone and carbonate reservoirs / American Association of Petroleum Geologists Bulletin 96:2193~2214 Crossref

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