The Thesis, which has the purpose of identifying non-structural and combines-type hydrocarbon traps, demonstrates results of combining various types of quantitative analysis (AVO-study, seismic inversion and spectral decomposition) of 2D and 3D seismic data within the Eastern part of the Northern Edge of Dnieper-Donets Depression. Total area of the polygon of study is around 1000 km2 and territorially it is located between Maksalske and Chervonopopivske fields.
The mechanism of AVO-study was tested in the north-western part of the polygon, which was based on approximately 200 length kilometers of 2D seismic data acquired in 2015-2018 (basically the reverse task of this method was performed), and elastic inversion was applied to discovered fields with known producing horizons. The effectiveness of these methods was proven in Moscovian and Bashkirian deposits of Carbon Age. The complex combination of AVO-study, elastic inversion and structural mapping was performed. Two combined-type objects were identified, and 3D seismic acquisition for the area 214km2 was planned to verify these objects.
It was first time, that the northern part of the polygon within this part of the Norther Edge of DDD, with acreage 220km2, that data of the structural mapping, AVO-study, elastic inversion and spectral decomposition were studied in complex. As a result, one non-structural type object was identified in the M-7 horizon, and the location for drilling the prospecting well was planned in order to penetrate two perspective objects simultaneously: first object – non-structural type lithological channel body in the M-6 horizon, second object: a combined type object on the B-6 horizon controlled by a discordant fault.
It was the first time within the south-eastern part of the polygon located in the Eastern region of the Northern Edge of DDD, that inversion research was performed within Serpukhovian deposits, and deep verification of received data was carried out. Complex assessment criteria of such objects and further directions of work were offered. Also, it was the first time in this region, that based on drilling data and analytical calculations, main criterion requirements to anomalies received in the result of seismic data quantitative interpretation, were identified. The main requirements represent the acreage (over 1 square kilometer), the shape and configuration (the anomalies must not be mosaic), good correlation with the structural factor and drilling results, complex approach while identifying the anomaly using the AVO-study, inversion and spectral decomposition methods.
It was the first time within the central part of the polygon located in the Norther Edge of DDD, that stochastic inversion was carried out, and seismic resolution was substantially increased. Also, it was the first time that complex approach was applied to analyze the data on structural factor presence, anomaly presence (based on gradation of the anomalies identified as a result of stochastic inversion), and reserves data for this region. An explicit algorithm for ranging prospecting wells in the conditions of a multihorizontal field was created.
