Assessment of petroleum potential of the pre-Jurassic reservoirs of Ust-Tym megadepression (using the data of geothermics and drilling)
Relevance of research is caused by the necessity to reproduce and to expand the resource base of oilfields in southeast of Western Siberia. The main aim of the research is to define and to propose the priority areas for exploration and development of pre-Jurassic oil and gas complexes in the poorly...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2019-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya-tpu.ru/archive/article/view/1559 |
| Summary: | Relevance of research is caused by the necessity to reproduce and to expand the resource base of oilfields in southeast of Western Siberia. The main aim of the research is to define and to propose the priority areas for exploration and development of pre-Jurassic oil and gas complexes in the poorly studied territory of Ust-Tym megadepression and structures of its framing. Object of research is the pre-Jurassic reservoir, that is the collectors of Triassic weathering crust and the collectors of Paleozoic basement. The collectors of weathering crust are formed on clay and siliceous rocks and volcanic rocks of acid composition, the lower-middle Jurassic clay thicknesses serve as fluid seal. The secondary collectors in the bedrock basement are developed on metamorphic and magmatic rocks, clay formations of bark of aeration or impermeable rocks in the basement can serve as fluid seal. Methods of researches include reservoirs geomapping, analysis of generated oil density distribution, evaluation and analysis of density distribution of primary accumulated oils reservoirs, zoning of reservoirs according to the prospectivity degree. As a result of researches the authors have systematized the complex of geological and geophysical data on the object of research and have given the volumetric-areal characterization for pre-Jurassic reservoirs - the maps of the total thickness and quality collectors were plotted by the deep drilling, taking into account petro types of bedrocks and intensity of breaking tectonics. The generated oil density distribution, obtained based on mapping by geotemperature criterion of generation paleohearth in Togur maternal deposits, was analyzed. The authors plotted the maps of distribution of accumulated resources relative density, carried out reservoir zoning and proposed the areas of priority for searching for weathering crust reservoir - northeast side of Ust-Tym megadepression, for basement rocks reservoir - the north-eastern slope of the North-Parabel megamonoklin and the Southern-Pyzhinsk mezodeflection. The results show the technique of predicting oil-and-gas presence with attraction of paleotemperature modeling. The authors made a conclusion on the value of geothermal data, which allow solving a conceptual problem of the source of hydrocarbons. |
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| ISSN: | 2500-1019 2413-1830 |