9th Simposio Bolivariano - Exploracion Petrolera en las Cuencas Subandinas

It is known that around 90% of the world’s hydrocarbons have been generated by a relatively small
number of ultra-rich source intervals deposited during specific periods of geological time. Many mechanisms
have been proposed to explain this particular stratigraphic source rock distribution (oceanic anoxia,
biologic evolution, global climate changes, etc), but its origin is still in debate. It is clear that basins where one
or more of these world class source rocks are present (e.g.: northwest South America, central North Africa)
makes them extraordinarily prolific. However, in most cases all the hydrocarbons found in those areas are
systematically considered to be uniquely sourced by these ultra-rich intervals, neglecting the importance of
other apparently less relevant organic-rich intervals.

The knowledge of velocity model not even along well but at offset is key for building of VSP-CDP image
and tie of VSP and surface seismic data. And the task is more difficult in situations of lateral variations of the
media properties, that very typical for highlands. The quality of obtained image is in a straight dependence on
quality of reference model. And it is the main reason to obtain adequate reference model for offset-VSP
processing.

Vertical seismic profiling (VSP) is a popular seismic exploration technology that has been confirmed to be
really efficient for solution of various geological problems even in very complicated conditions. The way
to achieve this and take all of the VSP advantages (such as efficient velocity model recovery, direct impulse
shape estimation and zero-phase deconvolution, detailed surface-borehole tie, high-resolution imaging
and dynamic inversion) is to implement correct processing techniques. In this paper we present key principles of VSP data
processing yielded and inherited as a result of more than 40 years experience in borehole seismic. These
principles form the concept of model based processing technology which includes state-of-the-art developments
and is aimed at high quality and reliability of the acquired results. Demonstrated case histories show examples of
efficiency of the presented technology of VSP data processing.

Las áreas con fuertes relieves y coberteras basálticas, suelen llevar asociadas una
información sísmica de mala calidad, pero a su vez pueden tener importantes recursos.

The main goal of this paper is to establish an algorithm of segmentation of lithologies based on welllogs
data processing by the wavelet transform modulus maxima lines (WTMM).Combined with the detrneded
fluctuation analysis DFA .To automate interpretation and to help the geologists to construct the lithofacies. A study
made by B.Audit and al showed that this estimator is recommended for signal of low number of samples , we
used it to enhance the estimation of the coefficients of roughness of the various geological mediums.

Chihuido de la Salina and El Portón oilfields are located in the southwest portion of the Mendoza
Province and northwest portion of the Neuquén Province in Argentina, in the eastern border of the
faulted and folded belt of the Neuquina Basin (figura 1).

The combination of abrupt topography, complex near-surface and sub-surface conditions, and a
significant tri-dimensional component make the Foothills of Colombia an extremely challenging area for seismic
activities. These characteristics are responsible for the absence of high-quality seismic data on these areas and
therefore, they ask for alternative strategies of seismic data processing, modeling and interpretation.

Los Campos de Gas, del Área Mayor de Anaco, se encuentran localizados en el Oriente de Venezuela aproximadamente a unos 30 Km de la Ciudad de Anaco, Estado Anzoátegui. ( Figura 1 )

Stratigraphic surfaces, rather than lithologic units,
are the support of stratigraphic correlation using
sequence stratigraphy and other correlation techniques
in passive-margin basins.

The structure and kinematics of the central and northern segments of the eastern fold-and-thrust belt of
the Eastern Cordillera (EC) and Llanos Basin (LlB) of Colombia was analyzed.