摘要
上古生界太原组和山西组海陆交互相泥页岩是南华北盆地的主要烃源岩层系之一,以往的研究工作主要集中于坳陷区,针对隆起区页岩气成藏方面的研究相对较少。为解决海陆交互相地层砂泥岩(含页岩)互层频繁、垂向上非均质性强、页岩气地质条件复杂等因素导致储层改造层位优选困难的现状,通过对太康隆起西部海陆交互相页岩气参数井--尉参1井分析测试结果的解剖,结合邻井钻探成果,对太原组和山西组泥页岩的展布特征、地球化学特征及储层特征等开展研究,明确上古生界页岩气成藏要素。结果表明:太康隆起地区上古生界海陆交互相泥页岩发育,山西组和太原组泥页岩累计厚度为88 m,山西组连续厚层泥页岩厚度可达38 m,各层泥地比超过50%,有机碳含量高,含气性较好,具备一定的页岩气形成有利地质条件;泥页岩孔隙以纳米级无机孔隙为主,粒间孔、粒内孔均有发育,受沉积环境转变和有机质类型的影响,有机质孔隙发育较差;三叠系残余厚度是影响上古生界页岩气成藏的重要因素,太康隆起西部保存条件较好。详细阐明了上古生界海陆交互相页岩气地质条件,明确隆起西部是下一步勘探的有利地区,对该区后续页岩气储层研究及层位优选有重要意义。
The marine-continental interaction facies shale in the Upper Paleozoic Taiyuan and Shanxi Formations is considered as one of the major source-rocks for the Southern North China Basin. Previous researches of shale gas accumulation have focused on the depression zones rather than the uplift zones. The interval optimization for shale gas reservoir stimulation is greatly challenged by the frequent sand-shale interbedding,strong longitudinal heterogeneity and complex shale gas geology. The Well Cangshen 1 test data of the marine-continental interaction facies in the western Taikang Uplift were used to study the shale distribution patterns,geochemical properties and physical properties in the Taiyuan and Shanxi Formations and identify the Upper Paleozoic shale gas accumulation elements by combining with the adjacent well drilling findings. Research indicates that the Taikang Uplift shows a well-developed Upper Paleozoic shale with marine-continental interaction facies. The cumulative shale thickness for the Shanxi and Taiyuan Formations is 88 m. The thickness for the continuous shale in the Shanxi Formation is up to 38 m with a shale-stratum thickness ratio of more than 50%. The shale is characterized by high organic carbon content and favorable gas content,which is favorable for shale gas accumulation. The shale pores are dominated by nanoscale inorganic pore and a part of intergranular pore and intragranular pore. The organic pore is relatively less-developed due to the sedimentary environment transformation and organic matter type. The Upper Paleozoic shale gas accumulation is greatly dependent on the Triassic residual thickness and the western Taikang Uplift shows a favorable preservation condition. The shale gas geology of the Upper Paleozoic marine-continental facies is clarified in detail,which reveals that the western part is a favorable zone for further hydrocarbon exploration. This research could provide certain guidance for the further shale gas reservoir characterization and horizon optimization.
作者
曾秋楠
张交东
于炳松
刘旭锋
周新桂
Zeng Qiunan;Zhang Jiaodong;Yu Bingsong;Liu Xufeng;Zhou Xingui(China University of Geosciences ( Beijing) , Beijing 100083, China;Centre for Oil and Gas Survey,hina Geology Survey,eijing 100083, China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2019年第3期49-55,共7页
Special Oil & Gas Reservoirs
基金
国家科技重大专项“南华北地区海陆交互相页岩气勘查评价应用试验”(2016ZX05034004-006)、“南华北盆地油气资源战略调查”(1211302108023)
关键词
海陆交互相
页岩气
上古生界
太康隆起
南华北盆地
marine-continental interaction facies
shale gas
Upper Paleozoic
Taikang Uplift
Southern North China Basin