Figure 5-Middle and Upper Jurassic stratigraphy of the central Russian platform.
TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractThe Maloichskoe field is located in the southeastern part of the West Siberian basin in Novosibirsk oblast (Fig. 1). It was the first field in the basin where commercial oil was produced from the Paleozoic basement. The reservoir consists mostly of limestones and dolomites that are intensively fractured and contain numerous vugs in some zones. The reservoir properties of the matrix are generally negligible, and the production potential of wells is mostly associated with natural fractures and vugs.The presented study was our first project in Russia where a complete integrated approach was implemented to properly characterize a fractured reservoir. The approach included the following tasks: 1) Identification of fractured intervals in wells using a special technique of BKZ logs processing, 2) Spectral imaging and high-resolution inversion of the seismic data, 3) structural analysis of the field, 4) construction of the reservoir properties model, 5) construction of the fracture distribution model using the Continuous Fracture Modeling approach (CFM).The final geologic model served as a basis to select the locations for the new wells. The new locations were proposed in the zones with the most intensive development of a network of natural fractures (according to the model). The drilling was associated with significant losses of drilling mud that was an indirect indication of presence of significantly fractured zones. The wellbore image FMS that was recorded in the well, showed a good level of correspondence between the model forecast and the actual result. The well contains interval of numerous fractures and large vugs. Eventually, the well showed a good production results and currently is one of the best producers in the field.As such, we recommend application of the described integrated approach for modeling complex fractured reservoirs in the other fields of Russian Federation.
The field is located in the southeastern part of the West Siberian basin in Novosibirsk oblast (Fig. 1). It was the first field in the basin where commercial oil was produced from the Paleozoic basement. The reservoir consists mostly of limestones and dolomites that are intensively fractured and contain numerous vugs in some zones. The reservoir properties of the matrix are generally negligible, and the production potential of wells is mostly associated with natural fractures and vugs. The presented study was our first project in Russia where a complete integrated approach was implemented to properly characterize a fractured reservoir. The approach included the following tasks: 1) Identification of fractured intervals in wells using a special technique of BKZ logs processing, 2) Spectral imaging and high-resolution inversion of the seismic data, 3) structural analysis of the field, 4) construction of the reservoir properties model, 5) construction of the fracture distribution model using the Continuous Fracture Modeling approach (CFM). A comprehensive description is available on a previous publication1. The final geologic model served as a basis to select the locations for the new wells. The new locations were proposed in the zones with the most intensive development of a network of natural fractures (according to the model). The drilling was associated with significant losses of drilling mud that was an indirect indication of presence of significantly fractured zones. The wellbore image FMS that was recorded in the well, showed a good level of correspondence between the model forecast and the actual result. The well contains interval of numerous fractures and large vugs. Eventually, the well showed a good production results and currently is one of the best producers in the field. As such, we recommend application of the described integrated approach for modeling complex fractured reservoirs in the other fields of Russian Federation. Introduction The field was discovered back in 1974 by the exploration well 2, which was drilled in the southern part of the anticline that was delineated by seismic data. Commercial flow of oil was produced from the carbonate reservoirs of the "M" horizon that represents the uppermost portion of the Paleozoic basement2. The discovery has attracted a significant attention at the time, being a first demonstration of the productive potential of West Siberian basement3. In the next few years a series of medium and small size oilfields with pre-Jurassic reservoirs have been found in the southeastern part of the basin (e.g. Archinskoe, Chkalovskoe, Urmanskoe, Gerasimovskoe, and others). In all of these fields oil was produced from the basement carbonates and weathering crust. Further investigation on Pre-Jurassic reservoir of the SE West Siberia showed that production potential is mostly related to the basement limestones that have been significantly affected with secondary processes such as dolomitization, leaching, and fracturing4. Following the initial discovery, 19 wells have been drilled in the field, and 8 of them produced commercial oil rates. The results of core investigations and well test analyses showed that the productive unit "M" consists of a complex fractured vuggy-porous type of a reservoir. A presence of opened fractures was determined as a key factor that defines productive potential of wells. General information The basement of the field consists mostly of Paleozoic carbonates that also include some layers of siliciclastic and volcanic rocks. The overall structure of the field represents a elongated anticline of an irregular shape that is located northwest of Mezhov arch. Interpretation of 3D seismic data showed that the basement strata contain numerous nearly vertical faults (Fig. 2). The faults are rarely traceable above the top of Jurassic Tyumen formation.
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