鄂爾多斯盆地上古生界輸導(dǎo)體系與天然氣運(yùn)移關(guān)系淺析
[Abstract]:Based on the regional geological data of the Upper Paleozoic in the Ordos Basin, the porosity sandstone and mudstone are studied by observing the pore structure of the core and casting thin slice, and combining with the determination and analysis of the conventional porosity and permeability. The transport properties and differences of fractured sandstone, mudstone and fault are studied. On this basis, the types of the Upper Paleozoic transport system in the basin are divided and its distribution is studied. At the same time, the evolution of Upper Paleozoic tectonic framework and the characteristics of hydrocarbon migration in Ordos Basin are studied. The main results are as follows: (1) in porous sand and mudstone, the connectivity and permeability in parallel direction are generally superior to those in vertical direction. In fractured sand and mudstone, the permeability of fracture developing direction is much larger than that of pore sand and mudstone around fracture. In the plastic compaction section, the transport performance of faults is generally poor, while in the elastic-plastic compression section and fracture section, the transport performance of fault is generally good. (2) the Upper Paleozoic transport system of Ordos Basin is classified in the Upper Paleozoic strata of Ordos Basin. The natural gas transportation system can be divided into two types: porosity based transportation system and fracture based transportation system. At the same time, there are a small number of fault-dominated transport systems. (3) the distribution characteristics of the Upper Paleozoic transport system in the Ordos Basin are in the Upper Paleozoic strata of the Ordos Basin. When the buried depth is less than 2200 meters, this stage is dominated by the pore transport system. When the buried depth is more than 2200 meters, this stage is dominated by fissured transport system. (4) study on the tectonic evolution zoning of Upper Paleozoic and the migration of natural gas in Ordos Basin during the tectonic evolution of the Upper Paleozoic in Ordos Basin. Due to the fact that the migration direction of natural gas has not changed in the area to the east of Badesai-Otoki Qianqi-Wuqi-Fuxian county, it is easy for the gas to accumulate in this area to form a reservoir. It is not difficult to find that the gas reservoirs of the Upper Paleozoic have a good degree of coupling with the similar areas of modern and ancient. So from the Middle Jurassic to now, the similar area of tectonic evolution is the main distribution area of Upper Paleozoic gas reservoir, and unconventional natural gas distributes along the relatively low point of the structure.
【學(xué)位授予單位】:西北大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:P618.13
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