DOI: 10.1016/j.palaeo.2014.04.007
论文题名: Detecting baffle mudstones using microfossils: An integrated working example from the Cardamom field, block 427 garden banks, Gulf of Mexico
作者: Jackett S.-J. ; Jobe Z.R. ; Lutz B.P. ; Da Gama R.O.B.P. ; Sylvester Z. ; Prince I.M. ; Albrecht H.L. ; Prasad T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 413 起始页码: 133
结束页码: 143
语种: 英语
英文关键词: Baffle
; Messinian
; Microfossils
; Morphogroups
; Mudstone
; Salt minibasin
英文摘要: Sedimentological observations, planktonic microfossil data, terrigenous index proxy data, benthic morphogroup analyses, pressure analyses and geochemical fingerprinting were integrated in order to assess the nature of mudstones in the Cardamom Field in the Auger salt withdrawal minibasin (Gulf of Mexico). Both ponded and slope accommodation have occurred through the salt basin's history resulting in complex stratigraphic architecture of stacked submarine lobes and channels. Continuous core (164. ft) from the Messinian reservoir unit enabled this study to assess the depositional nature of the mud-rich intervals. Four mudstone facies (Mudstones 1-4) and respective depositional settings were interpreted. A modified benthic foraminifera microfacies model, in conjunction with variations recorded in planktonic flora and fauna abundances and reworking, serves as the key reference for the paleoecological interpretations. Of particular interest is the potential of a 41. ft thick (below seismic resolution) intra-reservoir mudstone (Mudstone 3) to act as a baffle/barrier to fluid flow between the lower U Sand and the upper U Sand. Mudstone 3 shows a hemipelagic character containing a diverse benthic community, high abundances of autochthonous planktonic flora and fauna, reduced terrigenous input and extensive bioturbation. Downhole formation pressure data and fluid fingerprinting from the reservoir pay sands (upper and lower U Sands) show significant differences in the calculated pressure gradients and fluid composition. This suggests that most likely the two reservoir pay sands are not in vertical communication. Mudstone 3 paleoenvironmental analyses suggest the lateral extension of a possible baffle/barrier to vertical fluid flow. These results show that benthic morphogroup analyses in mudstones can be a robust method to assess reservoir compartmentalization and consequently, impact field development planning and reservoir modeling. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69215
Appears in Collections: 过去全球变化的重建
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作者单位: Applied Stratigraphy and Paleontology, Shell International Exploration and Production, 200 North Dairy Ashford, Houston, TX, United States; Clastics Research, Shell International Exploration and Production, Westhollow, Houston, TX, United States; Fluid Evaluation and Sampling, Shell International Exploration and Production, 200 North Dairy Ashford, Houston, TX, United States
Recommended Citation:
Jackett S.-J.,Jobe Z.R.,Lutz B.P.,et al. Detecting baffle mudstones using microfossils: An integrated working example from the Cardamom field, block 427 garden banks, Gulf of Mexico[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,413