鄂尔多斯盆地三叠系延长组陆相致密油发现、特征及潜力

doi:10.3969/j.issn.1672-7703.2017.06.002

摘要/Abstract

摘要： 中国在鄂尔多斯盆地上三叠统延长组发现全球第一个陆相工业致密油田。不同于北美海相页岩层系液态烃，鄂尔多斯盆地致密油层是湖相沉积，致密油主要赋存于湖盆中部延长组7段中上部致密砂岩储层中，具有砂体复合叠置（厚度为20~70m）、储层致密（孔隙度为6%~12%、渗透率小于0.3mD）、脆性矿物含量高（70%~80%）、原油充满程度高（含油饱和度为60%~80%）、原油品质高（地层条件下原油密度约为0.70~0.75g/cm³）、低压低产（地层压力系数为0.6~0.8、单井日产几吨到十几吨）、大面积连续分布（分布面积为3×10⁴km²）等地质特征。基于鄂尔多斯盆地长7段致密油地质特征与钻探资料，利用致密油"甜点区"分布预测法，评价出长7段原地资源总量为42.3×10⁸t，平均资源丰度约为15×10⁴t/km²，分布面积为2.9×10⁴km²。第一个陆相致密油田的发现与整体开发，对于类似陆相坳陷盆地规模利用低品位致密油资源具有里程碑意义。

关键词: 陆相致密油, 连续型石油聚集, 甜点区评价, 资源潜力, 页岩油

Abstract: The first commercial tight oil field in continental facies in the world was discovered in the Upper Triassic Yanchang Formation of the Ordos Basin in central China. Different from other liquid hydrocarbons found in marine shale systems in North America, tight oil reservoirs in the Ordos Basin are lacustrine deposits where the tight oil is mainly preserved in tight sandstones in the middle-upper seventh member of the Yanchang Formation (Chang 7 Member) in a lacustrine basin, and characterized by overlapped sand bodies (20-70 m thick), tightness (with porosity of 6%-12%, permeability <0.3mD), high brittle mineral content (70%-80%), high crude oil saturation (60%-80%), high crude oil quality (in-place oil density of 0.70-0.75 g/cm³), low formation pressure (pressure coefficient between 0.6-0.8), low production (several tons to more than ten tons per well per day), and extensive and continuous distribution (3×10⁴km²). Based on the geological and drilling data of the tight oil in the Chang 7 Member of the Ordos Basin, and using the "sweet spots prediction method", this paper calculates that the in-place petroleum resources is 42.26×10⁸t, the average resource abundance is 15×10⁴t/km², and the distribution area is 2.9×10⁴km² in the Chang 7 Member. The discovery and overall development of the first continental tight oil field is of great importance for large-scale exploitation of lowquality tight oil resources in similar continental depression basins.

Key words: continental tight oil, continuous petroleum accumulation, evaluation of sweet spot region, resource potential, shale oil

中图分类号:

TE122.2

杨智, 付金华, 郭秋麟, 林森虎, 陈宁生, 潘松圻, 李士祥. 鄂尔多斯盆地三叠系延长组陆相致密油发现、特征及潜力[J]. 中国石油勘探, 2017, 22(6): 9-15.

Yang Zhi, Fu Jinhua, Guo Qiulin, Lin Senhu, Chen Ningsheng, Pan Songqi, Li Shixiang. Discovery, characteristics and resource potential of continental tight oil in Triassic Yanchang Formation, Ordos Basin[J]. China Petroleum Exploration, 2017, 22(6): 9-15.

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