Objective
Aim of the project is to develop a combination of synergetic techniques for the recognition and definition of the internal structures of reservoirs using advanced seismic methodologies and high-resolution logs analysis.
PHASE I : Pre-stack analysis
Concerning the "recognition and inversion of stacking velocity anomalies" this period of work has been devoted firstly to design the main configuration of the software package composed of four programs; the software development and implementation of each program is still in progress.
In particular for the detection of stacking velocities, automatic picking algorithms of the coherence volume have been developed.
Concerning the "stratigraphic pre-stack analysis of seismic signals" a methodology of AVO analysis has been studied and successfully tested to three separate brightspots in the Po valley. Further theoretical studies of this technique, to include evanescent waves phenomena in the reflectivity modeling, have been also studied.
HR logs
The HR logs computer works are in progress with enphasis to the development of a workstation software program (DIAMAGE) for pictures and HR logs interpretation. Some basic functions as depth matching, visual interactive correlations and core picture orientation have been already developed.
Concerning fracture interpretation DIAMAGE can provide a good tool. The geologist can realize sedimentological or fracture study. The reservoir engineer can detect high permeability layer for completion, and compare CPI results with pictures or orientate the maximum stress and predict flooding anisotropy in fractured reservoirs.
PHASE II : Calibration of the HR logs by analysing well cores
This phase of the project was aimed at developing a statistical analysis methodology based on "cluster analysis" algorithm, allowing an accurate and more objective recognition of fracturation parameters in borehole, starting from the available log and core data.
The analysis was focused on travel time transit time and energy data of the various waveform components, given from sonic tools (SLC and SDT) and on high resolution logs (FMS) qualitative evaluation.
The fundamental phase of work was the log-facies and the HR logscharacterization with core data.
The project comprehends two phases:
PHASE 1:
Its purpose is the development of innovative methodologies and technics and improvement of the already tested tool performances.
The research will tackle two aspects: the seismic information analysis and the fracture characterization by high resolution logs interpretation.
The first aspect's aim is to analyze the seismic datum respectively in prestack domain and post-stack domain.
In pre-stack domain, the identification and study of the velocity and amplitude anomalies, as function of the offset, will provide further physic information on the reservoir rocks properties and their lateral variation.
In post-stack domain, using statistical methods, relationships between significant seismic parameters and petrophysical properties, in given reservoir intervals, will be searched.
In the second aspect, the research purpose is to study the type and distribution of natural fracture in the reservoir, by high-resolution logs. The use of these newtools requires a more detailed interpretation of the logs (BHTV-SHDT-FMS) and the calibration of logs with the core data.
PHASE II:
Application to real cases.
The results of the technics and methodogogies, developed in the Phase I, will be tested on suitable date and an application on real reservoir case will be tried : Cavone (AGIP), Yanga (SNEA(P)).
Programme(s)
Topic(s)
Call for proposal
Data not availableFunding Scheme
DEM - Demonstration contractsCoordinator
20097 S. Donato Milanese (MILANO)
Italy