寧武盆地太原組9#煤煤層氣儲(chǔ)層評(píng)價(jià)
[Abstract]:Coal-bed methane (CBM) reserves are considered as one of the most potential unconventional natural gas resources. China is rich in CBM resources, and the amount of shallow CBM buried within 2000m is 36.81 脳 1012m3, which is about the same as conventional natural gas. Ningwu Basin is a new high quality coal bed methane exploration project discovered by Chuanqing Company in recent years, but the coal seam research degree is still quite weak, which has seriously delayed the economic development process of this huge energy source. Coalbed methane development gas content is the basis, permeability is the key, reservoir pressure is the condition of sustainable and stable production. The type of # coal and rock in Ningwu Basin is mainly penumbrane-semi-bright type, which belongs to low-ash high quality fat coking coal, with gas content of 17.44 ~ 18.72 m ~ (3 / t), and a pressure of 8.7-13.3 MPA ~ (3 / t) in the middle of the 9 coal seam, which is a normal pressure reservoir. The fine fractures of Taiyuan formation in Ningwu Basin are developed, the porosity is mainly distributed in 2-8, the gas permeability is 0.01-1 脳 10 ~ (-3) 渭 m ~ (2), the pressure coefficient is 0.96, which belongs to the tight coal reservoir. The pore structure characteristics of coal and rock were studied by scanning electron microscope (SEM) and mercury injection experiment. The results show that pore size is concentrated in micropore and pore phase. According to the regional geological research, the thickness of the open and gentle coal seams in the south and north of Ningwu syncline is stable. The coal roof is mostly marl and mudstone, which is favorable sealing area. The bottom plate is dominated by mudstone and marlite, with some sandstone and siltstone and limestone. The sealing effect on coalbed methane reservoir is stronger, and the mudstone in the upper stratum of .9# coal seam is well preserved, so that the aquifer in this area is not developed. At the same time, coal bed methane well drainage water production is small, coal seam easy to reduce pressure desorption, is advantageous to coal bed methane development. Taiyuan formation 9# coal rock is a favorable area for coalbed methane exploration, and the difficulty of coalbed methane development is relatively small.
【學(xué)位授予單位】:西安石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:P618.13
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