江西省富有机质页岩层系构造埋藏史与页岩气富集

发布时间：2019-03-05 21:04

【摘要】：以江西省富有机质页岩层系为研究对象,采用文献调研—野外地质调查—实验测试—软件模拟—理论研究系统方法,以富有机质页岩层系构造埋藏史和保存富集为核心科学问题,在各区域的构造演化史恢复的基础上,恢复各富有机质页岩层系埋藏史,进一步研究埋藏—受热—成熟—生烃的配置关系及页岩气保存条件,探索江西省页岩气的富集模式,优选富集有利区。研究结果表明:富有机质页岩层系形成过程中受晋宁、加里东、海西、印支等多期构造运动影响,形成多个构造旋回;除赣西北区埋藏史属“早降晚抬”型外,赣东北区和萍乐坳陷区埋藏史均属“早抬晚降”型,经历多次沉降—抬升阶段,最大埋深均出现于喜马拉雅期;生烃过程中存在多次生烃过程,除赣西北寒武系页岩生烃高峰位于志留纪末期,其他页岩层系的生烃高峰均位于侏罗纪—古近纪之间,生烃过后均伴有不同程度的构造抬升。研究区内页岩具有较好的自封闭性,除梨树窝组和安源组顶底板封闭性相对较低外,皮园村组、王音铺组、观音堂组、荷塘组、乐平组、小江边组均具有较好的顶底板封存条件。区内修武复向斜、九瑞复向斜、北部向斜、中部向斜及萍乐坳陷东段断层发育较少,保存条件较好。基于埋藏—生烃配置关系,考虑保存条件,总结出江西省页岩气富集模式,认为页岩气富集成藏经历了源—盖沉积期、初始富集期、持续富集期(动荡富集期)和保存定型期四个阶段,以保存定型期控制作用为主。将省内保存富集有利区划分为5类,并在全省范围内优选出修武复向斜、九瑞复向斜、中部复向斜等9个富集有利区。
[Abstract]:Taking the organic shale stratigraphy of Jiangxi Province as the research object, this paper adopts the systematic method of literature investigation, field geological investigation, experimental test, software simulation and theoretical research. Taking the history of structural burial and preservation and enrichment of rich organic shale series as the core scientific problems, on the basis of the restoration of tectonic evolution history in various regions, the burial history of rich organic shale strata is restored. The distribution relationship between burial, heating, maturity and hydrocarbon generation and the conditions of shale gas preservation were further studied, and the enrichment model of shale gas in Jiangxi Province was explored, and the favorable areas for enrichment were optimized. The results show that the formation process of rich organic shale strata is influenced by the multi-stage tectonic movements, such as Jinning, Caledonian, Hercynian, Indosinian and so on, resulting in the formation of multiple tectonic cycles. Except that the burial history of northwest Jiangxi belongs to "early fall and late lift" type, the buried history of northeast Jiangxi and Pingle depression all belong to "early lift and late fall" type, which has experienced many subsidence-uplift stages, and the maximum buried depth has occurred in the Himalayan period. The hydrocarbon generation peak of Cambrian shale in northwest Jiangxi is located at the end of Silurian period, the hydrocarbon generation peak of other shale strata is between Jurassic and Paleogene, and the hydrocarbon generation is accompanied by different degrees of tectonic uplift after hydrocarbon generation. Besides Lishuwo formation and Anyuan formation, the sealing ability of roof and floor is relatively low, Piyuancun formation, Wangyingpu Group, Guanyintang Group, Hetang Group, Leping Group, etc, have good self-sealing property in the study area, except that Lishuwo formation and Anyuan formation are relatively low. Xiaojiang edge group all have better conditions of top and floor sealing. The faults of Xiu Wufu syncline, Jiurui complex syncline, northern syncline, central syncline and eastern Pingle depression are less developed in this area, and the preservation conditions are better. Based on the relationship between burial and hydrocarbon generation and considering the preservation conditions, this paper summarizes the shale gas enrichment model in Jiangxi Province, and considers that the shale gas rich integrated reservoir has experienced the source-cap sedimentary period and the initial enrichment period. There are four stages of continuous enrichment period (volatile enrichment period) and preservation stereotype period, which are mainly controlled by preservation pattern period. The favorable areas for preservation and enrichment in the province are divided into 5 types, and nine enrichment favorable areas, such as Xiu Wu complex syncline, Jiurui complex syncline and central one, are selected in the whole province.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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