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1、1银川盆地页岩气形成条件分析银川盆地页岩气形成条件分析摘要：摘要：银川盆地南起青铜峡，北至石嘴山，西依贺兰山， 东靠鄂尔多斯盆地西缘，南北长 165km，东西宽 4260km，总面积 7790km2，银川盆地在地质构造上被称为“银川地堑”。银川盆地整体呈北北东走向，基底呈南北高、中部低的船形，盆地中心位于平罗、贺兰、银川、永宁一带，最深部位大体位于平罗-银川一线以西及永宁、灵武之间的断陷处，在纵剖面上由平罗往北和由永宁向南又呈断阶状抬升。整个盆地为一东缓西陡的“向斜盆地”。为研究银川盆地页岩气形成条件，通过查阅相关文献以及对平凉组岩矿特征，含气页岩分布，页岩气有机地球化学的研究，对其地化特征做
2、出初步评价：银川盆地 3 口参数井仅银参 1 井曾采样进行生油分析。2036.53358.9 m 井段累积暗色泥质岩厚度为 515.9m。其中，清水营组暗色泥岩层厚度为 290.4 m，有利生油层段为3204328l m， 泥岩单层厚度约为 5m， 最大单层厚度达 20.5 m，并含有黄铁矿颗粒；有机碳含量 TOC 为 0.47%0.5%，氯仿沥青“A”含量为 0.0797%，有机质丰度一般；干酪根组分中类脂组分含量为 64.71%72.24 %，生油岩属型；镜质组反射率 Ro 为 0.69%，全烃色谱资料计算 OEP 为 1.18，说明该段有机质已经进入成熟阶段。灵武坳陷、银川北凹陷、常信凹
3、陷和平罗凹陷都处在有利的生烃范围。初步推测，清水营组成熟生油岩面积大于 200km2。但是对古近系的清水营组中、下部的沉积环境、岩性以及生烃能力的认识还不清楚。目前，要解决这些问题则需要利用现有的资料寻找隐含着的地质信息，进行合理的推测，页岩气的勘探前景也未知。关键词：银川盆地；页岩气；鄂尔多斯盆地；向斜盆地；地化特征西安石油大学大学毕业设（论文）IIConditions For Occurrence Of Shale Gas In Yinchuan BasinAbstract: South of Yinchuan Basin since Qingtongxia,north to Shizui
4、shan,Helan Mountain in the west,East on the western margin of the Ordos Basin,165km long from north to south,east-west width of 4260km. With a total area of 7790km2 and Yinchuan Basin in geological structure is said to “Yinchuan graben“. Yinchuan basin is a NNE strike,the basement was North South hi
5、gh and low in the middle of the boat shaped,basin,located in the center of the Pingluo,Helan,Yinchuan,Yongning area,the deepest gross area is located in between the Pingluo - Yinchuan line west and Yongning,Lingwu fault depression at,in longitudinal section by Pingluo to the north and You Yongning S
6、outh and was broken order form uplift. The whole basin is a steep slope in the west “synclinal basin“. For the study of Yinchuan basin shale gas formation conditions,by consulting relevant literature and distribution of Pingliang Formation Characteristics of rocks and minerals,including shale gas,sh
7、ale gas of organic geochemistry research,make a preliminary evaluation of its characteristics: Yinchuan basin 3 parameter wells only silver reference 1 well was sampled for source analysis. 2036.5 3358.9 m wells cumulative dark mudstone thickness is 515.9m. The Qingshuiying group of dark mudstone la
8、yer thickness is 290.4 m,Lisheng reservoirs of 3204 to 328l m,mudstone thickness approximately is 5m,the maximum monolayer thickness reached 20.5 m,and contain pyrite particles;organic carbon TOC content was 0.47% to 0.5%,that of chloroform bitumen“a“ content is 0.0797%,abundance of organic matter i
9、n general;kerogen fractions in liptinite fraction was 64.71% 72.24%,the source rock is type II;mirror vitrinite reflectance (RO) was 0.69%,total hydrocarbon chromatography data calculation OEP for 1.18 that the organic matter has entered a mature stage. Lingwu depression,north of Yinchuan sag，Changx
10、in sag in hydrocarbon generation sag,peace favorable range. It is presumed that the Qingshuiying mature source rock area of more than 200km2. However,it is not clear that the sedimentary environment,lithology and hydrocarbon generating ability of the water group in the ancient near. At present， to s
11、olve these problems,it is needed to use the existing information to find the hidden geological information,to make reasonable speculation. Shale gas exploration prospects are also unknown.西安石油大学大学毕业设（论文）IIIKey words: Yinchuan basin; shale gas; Erdos syncline basin; basin geochemical characteristic1目录目录第一章 绪论.11.1 课题背景及目的.11.2 国内外研究现状.11.2.1 世界页岩气勘探开发现状 .11.2.2 国内页岩气勘探及研究现状.31.2.3 鄂尔多斯盆地页岩气勘探开发现状.31.3 课题研究方法.41.4 论文构成及研究内容 .4第二章 地质背景.52.1 地层发育特征.62.2 地层沉积特征.62.3 页岩沉积背景.72.4 岩性及沉积相特征 .72.5 页岩气开发现状与对策 .9第三章 暗色泥页岩地化特征评价方式 .
