Mud diapirs and folds in the South Caspian Basin: Geometry and syn-sedimentary evolution of structures with petroleum interest
Metadatos
Mostrar el registro completo del ítemAutor
Santos Betancor, IdairaEditorial
Universidad de Granada
Director
Soto Hermoso, Juan IgnacioDepartamento
Universidad de Granada. Departamento de Geodinámica; Consejo Superior de Investigaciones Científicas (CSIC). Instituto Andaluz de Ciencias de la TierraMateria
Caspio Cuencas sedimentarias Diapiros Hidrocarburos Geología arqueológica Geodinámica
Materia UDC
551 551.25 250302 2506
Fecha
2016Fecha lectura
2015-11-20Referencia bibliográfica
Santos Betancor, I. Mud diapirs and folds in the South Caspian Basin: Geometry and syn-sedimentary evolution of structures with petroleum interest. Granada: Universidad de Granada, 2016. [http://hdl.handle.net/10481/42148]
Patrocinador
Tesis Univ. Granada. Departamento de GeodinámicaResumen
The South Caspian Sea is floored by a presumable oceanic crust and it was
generated during the Arabia-Eurasia collision in Mesozoic times. Plate convergence
has triggered deformation and subsidence forming a hydrocarbon-rich province with
active oil and gas production. From the Late Miocene to Present, the western margin
of the basin has been strongly controlled by uplift and deformation of the Caucasus
Mountains, which has promoted flexure of the crust, fast subsidence and an
enormous rate of sedimentation towards the Kura deltaic system.
Depocenters in the basin reach up to 20 km depth, which represents one of the
major sedimentary accumulations in the World. The Productive Series (PS; Late
Miocene-Late Pliocene, 5.9 to ~3.4-3.1 Ma) were deposited as a 6 km-thick marineto-
deltaic sequence, overlaid by the here referred as the Post- Productive Series
sequence (Post-PS; Late Pliocene to Present, <3.4-3.1).
Mud accumulations are widespread in the South Caspian Basin (SCB) shaping
innumerable shale diapirs and mud volcanoes. Diapir geometry depicts welldelineated
bodies usually connected with depleted feeder channels. The regional
source rock for mud structures is the Maykop Formation (Late Eocene to Early
Miocene, ~36-16.5 Ma). This shale-rich unit is also the major source rock for
hydrocarbons in the area. Hydrocarbons are majorly stored in the PS reservoirs and
are trapped by a Late Pliocene regional unconformity that represents a stratigraphic
seal in the top of the PS (~3.4-3.1 Ma).
This thesis has studied the Kirgan-Araz Deniz anticline (abbreviated as KAD)
within the Kurdashi structure, which involves the folded PS and the Post-PS
packages. Our work is based on the interpretation of over 700 km2 of seismic data
from a post-stack 3D seismic dataset migrated in depth, which has been correlated
with drill and logging information from the Araz Deniz IX exploration well. This
valuable information has been provided by REPSOL. The fold is a NW-SE anticline
located in the western margin of the SCB, in offshore Azerbaijan, to the South of the
Kura River mouth. Our research is focused on the reconstruction of the threedimensional
geometry of the structure, and the shape of the overpressured-mud
bodies that pierce the anticline. Deformation and sedimentation rates are also
estimated to reconstruct the accurate growth history of this anticline.