DOI: 10.1306/11181514223
Scopus记录号: 2-s2.0-84968747460
论文题名: Effects of early petroleum charge and overpressure on reservoir porosity preservation in the giant Kela-2 gas field, Kuqa depression, Tarim Basin, northwest China
作者: Guo X. ; Liu K. ; Jia C. ; Song Y. ; Zhao M. ; Lu X.
刊名: AAPG Bulletin
ISSN: 0149-1430
EISSN: 1558-9160
出版年: 2016
发表日期: 2016
卷: 100, 期: 2 起始页码: 191
结束页码: 212
语种: 英语
Scopus关键词: Compaction
; Deposition
; Gas industry
; Gases
; Natural gas fields
; Oil field development
; Petroleum reservoir engineering
; Petroleum reservoirs
; Porosity
; Proven reserves
; Sandstone
; Subsidence
; Tectonics
; Well logging
; Anomalously high porosities
; Low porosity and permeability
; Northern Tarim basin
; Porosity reduction
; Pressure coefficients
; Reservoir sandstones
; Sandstone reservoirs
; Tectonic compressions
; Low permeability reservoirs
; compaction
; compression
; Cretaceous
; disequilibrium
; Eocene
; gas field
; hydrocarbon reservoir
; overpressure
; permeability
; petroleum
; porosity
; sandstone
; subsidence
; tectonics
; China
; Kela 2 Field
; Kuqa
; Tarim Basin
; Xinjiang Uygur
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Kela-2 is a giant gas field with a proven reserve of 597 tcf in the Kuqa depression, northern Tarim Basin. Widespread over-pressures have been encountered in the Eocene and Cretaceous sandstone reservoirs of the field, with pressure coefficients up to 2.1 from drill-stem tests and well-log data analysis. Disequilibrium compaction associated with horizontal tectonic compression may be the dominant overpressure mechanism in the sandstone reservoirs; because the overpressured sandstone with a maximum burial depth over 6000 m (19,685 ft) displays anomalously high porosity and low density. The causes for sandstone reservoirs with anomalously high porosity in the Kela-2 gas field were studied based on an integrated investigation of sandstone reservoir characteristics, paleo oil-water contact, petroleum charge history, and overpressure evolution. Collective evidence indicates that early oil charge had retarded the porosity reduction of the reservoir sandstone and resulted in disequilibrium compaction from over-burden rocks, and overpressure from disequilibrium compaction and horizontal tectonic compression at the beginning of the rapid subsidence and deposition in the Kela-2 gas field again contributed to the preservation of the reservoir porosity: (1) overpressured mudstones in the Kela-2 gas field are characteristic of normal compaction, and overpressure was generated by horizontal tectonic compression instead of disequilibrium compaction; (2) the reservoir sandstones with high porosity and permeability are associated with high paleo oil saturation, as indicated by quantitative grain fluorescence [QGF) responses and anomalous QGF on extract intensity; (3) sandstone units below the paleo oil-water contact have very low porosity and permeability; and (4) three episodes of oil and one episode of gas charge are identified in the sandstone reservoirs of the Kela-2 gas field, and the later two episodes of oil charge occurred circa 5.5-4.5 Ma, which corresponds to the beginning of the rapid tectonic subsidence and deposition in the Kuqa depression. The initially charged oil in the sandstone reservoirs was subsequently displaced by gas at circa 3-2 Ma through fault activation at the edge of the anticline trap. The overpressure evolution for the K1bs reservoir sandstone in the Kela-2 gas field indicates that the apparent overpressure development in the sandstone reservoir began at 5 Ma following the major oil charge and has been maintained to the present. Over-pressure development from 5 Ma in the sandstone reservoirs of the Kela-2 gas field is believed to be the dominant cause of the porosity preservation. © Copyright 2016. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84968747460&doi=10.1306%2f11181514223&partnerID=40&md5=3fde95f5d683b354d4499d14e4966b5c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13001
Appears in Collections: 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
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Recommended Citation:
Guo X.,Liu K.,Jia C.,et al. Effects of early petroleum charge and overpressure on reservoir porosity preservation in the giant Kela-2 gas field, Kuqa depression, Tarim Basin, northwest China[J]. AAPG Bulletin,2016-01-01,100(2)