宁武盆地太原组9#煤煤层气储层评价

发布时间：2018-08-29 11:45

【摘要】：煤层气储量巨大,被誉为最具有开发潜力的非常规天然气资源之一。中国煤层气资源量丰富,埋藏2000m以内的浅煤层气资源量为36.81×1012m3,与常规天然气大致相当。宁武盆地是川庆公司近年新发现的具有煤层气勘探潜力的优质项目,然而煤层研究程度仍相当薄弱,已经严重迟缓了这一巨大能源的经济开发进程。煤层气开发含气量是基础,渗透性是关键,储层压力是持续稳产的条件。宁武盆地#煤岩类型以半暗-半亮型为主；属于低灰分优质肥焦煤；含气量为17.44～-18.72m3/t,属于中等：9煤层段压力为8.7-13.3MPa,为常压储层。宁武盆地太原组9#煤微裂缝发育,孔隙度主要分布在2%-8%,气测渗透率主要分布在0.01-1×10-3μ m2,压力系数0.96,属于致密煤岩储层。通过扫描电镜和压汞实验,研究了煤岩孔隙结构特征,实验表明孔径大小集中分布于微孔、小孔阶段。通过区域地质研究,宁武盆地向斜南、北二端开阔平缓,9#煤层厚度稳定。煤顶板绝大部分为泥灰岩、泥岩,是较有利封盖区。底板以泥岩、泥灰岩为主,局部为砂岩及粉砂岩、石灰岩,对煤层气藏的封闭作用较强,保存条件较好。9#煤层上部地层泥岩发育使该区含水层不发育,同时煤层气井排采产水量小,煤层易降压解吸,对煤层气开发有利。太原组9#煤岩是进行煤层气勘探的有利地区,煤层气开发难度相对比较小。
[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.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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