Microscopic and Fractal Characterization of Organic Matter within Lacustrine Shale Reservoirs in the First Member of Cretaceous Qingshankou Formation,Songliao Basin,Northeast China  

作　　者：Bo Liu Meng Yan Xianda Sun Yunfeng Bai Longhui Bai Xiaofei Fu 

机构地区：[1]Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development,Ministry of Education,Northeast Petroleum University,Daqing 163711,China [2]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610051,China [3]PetroChina Daqing Oilfield Company,Daqing 163318,China

出　　处：《Journal of Earth Science》2020年第6期1241-1250,共10页地球科学学刊（英文版）

基　　金：the Open Fund of the State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,China(No.PLC20180402);the National Natural Science Foundation of China(No.41972156);the National Basic Research Program of China(No.2016ZX05003-002)。

摘　　要：Understanding the occurrences of different fractions of organic matter in shale reservoirs is very important for the evaluation of shale oil.Lacustrine organic-rich shale samples from the first member of the Cretaceous Qingshankou Formation in the Songliao Basin were analyzed with confocal laser scanning microscopy(CLSM)and fluorescence spectral analysis.The results show that the occurrences of different organic components are related to the fabric of samples and vary with depth.The bulk content of light components is significantly higher than heavy components and exhibits a positive relationship with quartz and feldspar contents.Both light and heavy components are distributed parallel with the lamination in microscopic view in laminated samples,and randomly in massive samples.The maximum radius of light components in most of the samples is larger than 20μm,while it is smaller for heavy components,indicating the micro fractionation from clay/organic lamina to quartz/feldspar lamina.The depth of enrichment of light components corresponds to the oil maturity of organic matter.Both the distribution of light and heavy components fits the same fractal model,with fractal dimensions ranging between 2.2 and 2.5.The CLSM results confirm that it can be a reliable tool for the"sweet spot"exploration.

关 键 词：confocal laser scanning FRACTAL bitumen lithofacies shale oil 

分 类 号：P618.13[天文地球—矿床学]