Palynological and sequence stratigraphic analysis of the Napo Group in the Pungarayacu

Cristian Vallejo Cruz; Peter Hochuli; Wilfried Winkler; Katharina von Salis

doi:10.1006/cres.2002.1028

Palynological and sequence stratigraphic analysis of the Napo Group in the Pungarayacu

Cristian Vallejo Cruz, Peter Hochuli, Wilfried Winkler, Katharina von Salis

Geology and Geophysics

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

The study of palynomorphs and calcareous nannofossils from the Albian–Campanian Napo Group in the Pungarayacu 30
well in the Subandean Zone of Ecuador has led to a new biostratigraphic framework revealing the existence of several hiatuses
for this area. The palynological and palynofacies data are used together with other fossils and lithological evidence to define
a sequence stratigraphic framework. The distribution of palynomorphs and palynofacies indicates a strong terrestrial input for
the lower part of the Napo Group (Napo Basal and Lower Napo formations). In the upper part (Middle and Upper Napo
formations), terrestrial input is reduced and a restricted marine environment with several dysoxic–anoxic intervals can be
inferred. The hydrocarbons present in the well studied have traditionally been regarded as locally sourced. However, several
lines of evidence (TAS, Tmax and VR) prove the immature stage of the source rock in this borehole as well as in a larger
area.

Original language	English
Pages (from-to)	845-859
Journal	Cretaceous Research
Volume	23
DOIs	https://doi.org/10.1006/cres.2002.1028
Publication status	Published - 2002

Keywords

Napo Group
Ecuador
Oriente Basin

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10.1006/cres.2002.1028

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title = "Palynological and sequence stratigraphic analysis of the Napo Group in the Pungarayacu",

abstract = "The study of palynomorphs and calcareous nannofossils from the Albian–Campanian Napo Group in the Pungarayacu 30 well in the Subandean Zone of Ecuador has led to a new biostratigraphic framework revealing the existence of several hiatuses for this area. The palynological and palynofacies data are used together with other fossils and lithological evidence to define a sequence stratigraphic framework. The distribution of palynomorphs and palynofacies indicates a strong terrestrial input for the lower part of the Napo Group (Napo Basal and Lower Napo formations). In the upper part (Middle and Upper Napo formations), terrestrial input is reduced and a restricted marine environment with several dysoxic–anoxic intervals can be inferred. The hydrocarbons present in the well studied have traditionally been regarded as locally sourced. However, several lines of evidence (TAS, Tmax and VR) prove the immature stage of the source rock in this borehole as well as in a larger area.",

keywords = "Napo Group, Ecuador, Oriente Basin",

author = "{Vallejo Cruz}, Cristian and Peter Hochuli and Wilfried Winkler and {von Salis}, Katharina",

year = "2002",

doi = "10.1006/cres.2002.1028",

language = "English",

volume = "23",

pages = "845--859",

journal = "Cretaceous Research",

issn = "1095-998X",

publisher = "Academic Press Inc.",

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TY - JOUR

T1 - Palynological and sequence stratigraphic analysis of the Napo Group in the Pungarayacu

AU - Vallejo Cruz, Cristian

AU - Hochuli, Peter

AU - Winkler, Wilfried

AU - von Salis, Katharina

PY - 2002

Y1 - 2002

N2 - The study of palynomorphs and calcareous nannofossils from the Albian–Campanian Napo Group in the Pungarayacu 30 well in the Subandean Zone of Ecuador has led to a new biostratigraphic framework revealing the existence of several hiatuses for this area. The palynological and palynofacies data are used together with other fossils and lithological evidence to define a sequence stratigraphic framework. The distribution of palynomorphs and palynofacies indicates a strong terrestrial input for the lower part of the Napo Group (Napo Basal and Lower Napo formations). In the upper part (Middle and Upper Napo formations), terrestrial input is reduced and a restricted marine environment with several dysoxic–anoxic intervals can be inferred. The hydrocarbons present in the well studied have traditionally been regarded as locally sourced. However, several lines of evidence (TAS, Tmax and VR) prove the immature stage of the source rock in this borehole as well as in a larger area.

AB - The study of palynomorphs and calcareous nannofossils from the Albian–Campanian Napo Group in the Pungarayacu 30 well in the Subandean Zone of Ecuador has led to a new biostratigraphic framework revealing the existence of several hiatuses for this area. The palynological and palynofacies data are used together with other fossils and lithological evidence to define a sequence stratigraphic framework. The distribution of palynomorphs and palynofacies indicates a strong terrestrial input for the lower part of the Napo Group (Napo Basal and Lower Napo formations). In the upper part (Middle and Upper Napo formations), terrestrial input is reduced and a restricted marine environment with several dysoxic–anoxic intervals can be inferred. The hydrocarbons present in the well studied have traditionally been regarded as locally sourced. However, several lines of evidence (TAS, Tmax and VR) prove the immature stage of the source rock in this borehole as well as in a larger area.

KW - Napo Group

KW - Ecuador

KW - Oriente Basin

U2 - 10.1006/cres.2002.1028

DO - 10.1006/cres.2002.1028

M3 - Article

SN - 1095-998X

VL - 23

SP - 845

EP - 859

JO - Cretaceous Research

JF - Cretaceous Research

ER -

Palynological and sequence stratigraphic analysis of the Napo Group in the Pungarayacu

Abstract

Keywords

UN SDGs

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