辽河西部凹陷沙河街组页岩油聚集条件及资源计算  

Shale oil accumulation conditions and resource calculation of the Shahejie Formation in the Western sag,Liaohe

作　　者：葛明娜[1] 张金川[2,3] 包书景[1] 任收麦[1] 唐玄[2,3] 杨超[2,3] 

机构地区：[1]中国地质调查局油气资源调查中心,北京100029 [2]中国地质大学(北京)能源学院,北京100083 [3]国土资源部页岩气资源战略评价重点实验室,北京100083

出　　处：《地学前缘》2016年第1期64-73,共10页Earth Science Frontiers

基　　金：国家自然科学基金项目(41272167)

摘　　要：为查明辽河坳陷西部凹陷页岩油勘探潜力,明确页岩油富集控制因素,分析了沙三段页岩油成藏条件。以沙三段泥页岩为研究对象,通过FIB-SEM、自动氦孔隙度测定及BET-BJH等测试手段,结合地震、测井资料,以富有机质泥页岩生烃潜力、储集性能及含油性评价为重点,对辽河西部凹陷沙河街组页岩油资源计算方法进行探讨。分析结果表明：（1）TOC含量1.0%~8.54%,众值为2.15%;Ro为0.32%~1.57%,众值为0.65%,处于生油窗内;（2）泥页岩发育粒间孔、粒内孔和微裂缝等6种微孔缝类型,其中微孔以3.9~20nm的中孔为主;（3）西部凹陷沙三段发现工业油流1处,富含油2层,油斑16层,具有较好的含油性;（4）结合概率统计、类比法、权重赋值等手段,利用单元划分—分步计算—累加求和原理,初步探讨了页岩油资源计算方法——单元计算法。通过方法试用,认为沙三段具有较好的页岩油成藏条件和勘探前景。在辽河坳陷页岩油勘探实践中,宜将有机碳含量高、成熟度适中、孔渗性好及含油率高的区域作为有利选区优先领域,尽量避免热演化程度低、黏土矿物含量高的区域。To identify shale oil exploration potential of Shahejie Formation from Liaohe west sag and the controlling factors of shale oil,focused on Es3 Formation,combined with seismic and logging data,based on an emphasis on organic-rich shale hydrocarbon potential,reservoir property and oil-bearing assessment by the FIB-SEM,automatic helium porosity determination and BET-BJH tests,the shale oil resource calculation methods of Es3 are analyzed.The results show that,（1）the organic carbon content has a range of 1.0%-8.54% with a main value of 2.15%;Roranges from 0.32%to 1.57% with a main value of 0.65%,corresponding to the oil window;（2）six kinds of micropores developed in the shale such as inter-granular pores,grain pore and micro-fracture.They are dominated by mesopores with diameter between 3.9and 20nm;（3）Es3 Formation has 1industrial oil flow,2oil-enriched layers and 16 oil spots;（4）the methods-unit calculation method of shale oil resource was analyzed by probability and statistics,analogy,weight assignment principle and in unit division-step calculation-cumulative sum manner.It is concluded that Es3 Formation has a good exploration prospect and should be selected as an area with abundant organic matter,moderate thermal evolution,high porosity-permeability and oiliness.In contrast,formations with too low thermal evolution or too high content of clay,will be avoided.

关 键 词：西部凹陷 沙河街组 页岩油 含油率 单元计算法 勘探前景 

分 类 号：P618.13[天文地球—矿床学]