| 鄂尔多斯盆地中部上古生界山西组页岩储层特征 |
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| 引用本文： | 赵帮胜,李荣西,覃小丽,刘福田,吴小力,赵迪,刘齐,周伟.鄂尔多斯盆地中部上古生界山西组页岩储层特征[J].沉积学报,2019,37(6):1140-1151. |
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| 作者姓名： | 赵帮胜 李荣西 覃小丽 刘福田 吴小力 赵迪 刘齐 周伟 |
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| 作者单位： | 长安大学地球科学与资源学院,西安 710054;长安大学地球科学与资源学院,西安 710054;长安大学地球科学与资源学院,西安 710054;长安大学地球科学与资源学院,西安 710054;长安大学地球科学与资源学院,西安 710054;长安大学地球科学与资源学院,西安 710054;长安大学地球科学与资源学院,西安 710054;长安大学地球科学与资源学院,西安 710054 |
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| 基金项目： | 国家自然科学基金项目（41772118）；中央高校基本科研业务项目（300102278107，300102279304） |
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| 摘 要： | 鄂尔多斯盆地山西组发育一套厚度大且有勘探潜力的陆海陆过渡相页岩。应用岩芯观察、X衍射、扫描电镜和显微镜观察以及高压压汞等方法，对该盆地中部山西组页岩的岩石学、矿物学、页岩储集空间、孔隙结构和物性特征进行分析研究。结果表明:研究区山西组页岩以黑色泥岩、黑色页岩夹纹层或薄层状深色粉砂岩为主，页岩主要由黏土矿物和石英两类矿物组成，二者平均含量分别为59.6%和36.9%。页岩宏观和微观裂隙发育，显微镜下统计的显微裂缝平均面密度达到116.6/m。除了发育与矿物和成岩作用有关的矿物孔隙外，页岩中有机显微组分发育较多的有机质孔。页岩孔隙度平均为0.77%，渗透率平均为0.06×10-3 μm2。山西组页岩总有机碳（TOC）、镜质体反射率（Ro，%）和黏土矿物含量是影响页岩孔隙度的主要因素，具有正相关性，而石英含量与页岩孔隙度呈一定的负相关关系。山西组页岩中裂缝的普遍发育提高了页岩的渗透率，有利于页岩气聚集成藏。综合分析表明山西组页岩气储层地质条件一般，开发难度较大，但在裂缝发育、物性较好的层位和地区仍具有较好的页岩气资源前景。
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| 关 键 词： | 山西组 页岩 孔隙 裂隙 储层特征 鄂尔多斯盆地 |
| 收稿时间： | 2019-01-08 |
Characteristics of Shale Reservoirs in the Upper Paleozoic Shanxi Formation,Central Ordos Basin |
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| Institution: | School of Earth Science and Resources, Chang'an University, Xi'an 710054, China |
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| Abstract: | Shanxi Formation shale is a stratum of marine-continental transitional facies with potential for shale gas exploration in the Ordos Basin. The petrology, mineralogy,reservoir space,pore structure and reservoir quality of the shale show that Shanxi Formation shale comprises black mud shale,grey-black mudstone and dark grey silty mudstone. It mainly consists of 59.6% clay minerals and 36.9% quartz,on average. Fractures are classified into macroand microfractures;the latter mainly occur in the shale and organic macerals, with an average surface density of 116.6/m. In addition to mineral and diagenetic pores,organic pores occur in organic macerals,formed by hydrocarbon generation as a result of the high degree of thermal evolution. Shanxi Formation mud shale has an average porosity of 0.77% and an average permeability of 0.06×10-3 μm2.A positive correlation was found between total organic carbon (TOC), vitrinite reflectance(Ro) and clay mineral content;quartz content and shale porosity are negatively correlated. The general development of fractures increases the permeability of shale,favorable to the accumulation of shale gas. Comprehensive analysis shows that the geological conditions of the shale gas reservoir in the Shanxi Formation are general and difficult to develop. However,there are good prospects for shale gas in the layers and regions with fractures and associated properties. |
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