准南乌鲁木齐河东矿区煤层气赋存规律研究

发布时间：2018-03-18 06:46

本文选题：煤层气　切入点：含气量　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：乌鲁木齐河东矿区煤层层数多,煤层厚度大,煤阶低,煤层气各项参数在新疆极具代表性。本文选择乌鲁木齐河东矿区进行煤层气赋存规律和资源潜力研究,对新疆低煤阶煤层气资源评价及勘探开发具有重要的现实意义。通过室内外资料收集、现场调研采样及测试分析,应用煤层气地质学、煤岩学、沉积学、地球化学、煤田地质学等理论和方法,论述和研究了河东矿区煤层含气性、吸附性、煤储层物性特征,对煤层气的赋存及开发条件进行了较为深入的阐述。探讨了地质构造、沉积作用、煤变质作用、有效埋藏深度、顶底板岩性、煤岩煤质特征、水文地质条件对煤层气赋存的影响。通过研究表明,河东矿区含煤地层主要为侏罗系中统西山窑组与下统八道湾组,其中,41线以西西山窑组煤层较为发育,41线以东八道湾组煤层较为发育。煤层层数多、煤层厚度大、分布面积广,具有很好的生气潜力和封盖能力。煤储层具有较好的生气性和吸附性。煤层含气量随煤层埋深的增加而增大,随镜质体最大反射率的增加而增大,随煤层有益厚度的增加而增大。储层压力、渗透性等储层物性条件较有利于该区煤层气的开发,但不同地区差别较大,充分说明了煤层的非均质性。地质构造,沉积作用、顶底板围岩性质、水文地质条件均有利于煤层气的保存。综合分析认为,西山窑组无论是煤层气的生气条件还是赋存条件均好于八道湾组;北单斜fl正断层不发育的地方和八道湾向斜煤层气风化带以深的范围均是煤层气赋存较好的区域,其中,八道湾向斜南翼含气性可能比北翼好,在八道湾向斜轴部为煤层气含量最大区域。依据《煤层气资源/储量规范》(DZ/T0216-2010),运用体积法估算出研究区煤层气资源/储量为531.04×10~8m~3,为大型煤层气田,具有很好的开发前景。
[Abstract]:There are many coal beds in Hedong mining area of Urumqi, the thickness of coal seam is large, the coal rank is low, and the parameters of coalbed methane are very representative in Xinjiang. In this paper, the occurrence law and resource potential of coalbed methane are studied in Hedong mining area of Urumqi. It is of great practical significance for the evaluation and exploration and development of low rank coal bed methane resources in Xinjiang. Through indoor and outdoor data collection, field investigation, sampling and test analysis, coal bed methane geology, coal petrology, sedimentology, geochemistry are applied. Based on the theory and method of coalfield geology, this paper discusses and studies the gas-bearing, adsorptive and physical characteristics of coal reservoir in Hedong mining area, and expounds the occurrence and development conditions of coalbed methane, and discusses the geological structure and sedimentation. The influence of coal metamorphism, effective burial depth, roof and bottom slate, coal quality and hydrogeological conditions on the occurrence of coalbed methane is studied. The results show that the coal bearing strata in Hedong mining area are mainly the Xishanyao formation of Jurassic Middle Series and the Badaowan formation of Lower Series. The coal seams of the Xishanyao formation west of the Yan41 line are relatively developed, and the coal beds of Badaowan formation east of the Yan41 line are relatively developed. The coal layers are many, the thickness of the coal seams is large, and the distribution area is wide. The coal reservoir has good gas generation and absorbability. The gas content of coal seam increases with the increase of coal seam depth, and increases with the increase of vitrinite maximum reflectance. The reservoir physical properties such as reservoir pressure and permeability are favorable to the development of coalbed methane in this area, but there are great differences in different regions, which fully explain the heterogeneity, geological structure and sedimentation of coal seam. The properties of surrounding rock and hydrogeological conditions of roof and bottom are favorable to the preservation of CBM. The comprehensive analysis shows that the gas generating condition and occurrence condition of Xishan formation are better than that of Badaowan formation. Where the north monoclinic fl normal fault is not developed and the weathering zone of coalbed methane in Badaowan syncline is within a deep range, the coalbed methane exists well in the south wing of the Badaowan syncline, in which the methane content in the southern wing of the Badaowan syncline may be better than that in the north wing. According to DZ / T0216-2010, the CBM resource / reserve in the study area is estimated to be 531.04 脳 10 ~ (8) m ~ (-3) by volume method, which is a large coalbed methane field and has a good development prospect.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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