Development of organic pores in the Longmaxi Formation overmature shales: Combined effects of thermal maturity and organic matter composition
Development of organic pores in the Longmaxi Formation overmature shales: Combined effects of thermal maturity and organic matter composition
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龙马溪组过熟页岩有机质孔隙发育：热成熟度与有机质组成的综合影响
DOI：
10.1016/j.marpetgeo.2020.104314
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发表时间：
2020-06
影响因子：
4.2
通讯作者：
Liao Zhiwei
中科院分区：
文献类型：
--
作者：
Hu Guang;Pang Qian;Jiao Kun;Hu Chaowei;Liao Zhiwei
在许多生油岩非常规储层中，有机孔隙被认为是总孔隙度和油气储量的主要贡献者。中国，采用有机岩石学、聚焦离子束环境、扫描电子显微镜和低压氮气吸附-脱附等方法对四川盆地双河段(长宁县)和YS118井、JY2井采集的6个页岩样品进行了分析。显微镜下的点数结果表明，褐藻土的数量最多，包括I型和II型，其次是沥青和笔石的动物碎屑。褐藻土I、褐藻土II和沥青的含量分别为12%~48%、5%~35%、30%~48%。热成熟度、显微组分和孢粉形态对有机孔隙的发育有很大的影响。在所分析的样品中，页岩中的有机孔隙(>；10 nm)成熟度为2.5%Ro。此外，还利用扫描电子显微镜和低压氮气吸附、脱附等手段研究了不同显微组份的有机孔隙特征。一般来说，褐藻土I和固体沥青比其他显微组分具有更大和更丰富的有机孔隙。海藻土I和固体沥青具有大致相同的孔隙率(~13.0体积%)和相同的平均孔径(~180 nm)。沥青中的孔隙为海绵状和泡孔状，而沥青中的孔隙为细长的晶格状排列。与褐藻胶I相比，褐藻胶II具有更复杂的有机孔发育模式，有些单细胞藻胶II颗粒含有很少的纳米孔，而有些聚集的藻胶II含有大量的纳米级有机孔。对显微组分孢粉形态的详细研究表明，藻胶.I来源于底栖藻类，藻胶II来源于浮游植物。通过比较不同孢粉形态中有机孔隙的发育情况，认为不同藻类前驱体的孢粉形态具有不同的生烃潜力和生烃特征，影响过成熟阶段藻类显微组分中有机孔隙的发育。
Organic pores are considered to be the dominant contributors to total porosity and hydrocarbon storage in many.source rock unconventional reservoirs. In this study, organic petrology, focused ion beam–environmental.scanning electron microscopy (FIB-SEM), and low-pressure N2 adsorption and desorption were used to analyze.six shale samples obtained from the Shuanghe section (Changning County) and wells YS118 and JY2 in the.Sichuan Basin, China. Results of point-counting under the microscope show that alginite including type I and II is.most abundant followed by bitumen and zooclasts of graptolites. The contents of alginite I, alginite II, and.bitumen range from 12 vol% to 48 vol%, from 5 vol% to 35 vol%, and from 30 vol% to 48 vol%, respectively..Only few pores were found in graptolites. Thermal maturity, macerals, and palynomorphs have strong influences.on the development of organic pores. In the analyzed samples, organic pores (> 10 nm) in shale with a maturity.of2.5% Ro. In addition, characteristics.of organic pore in different maceral types are studied based on SEM and low-pressure N2 adsorption.and desorption. Generally, alginite I and solid bitumen have larger and more abundant organic pores than other.macerals. Alginite I and solid bitumen have approximately same porosity (~13.0 vol%) and same mean pore size.(~180 nm). Pores in a lginite I are elongated and lattice-like arranged, however, pores in bitumen are spongy.and vesicle pores. With respected to alginite I, alginite II has a more complicated pattern of organic-pore development..Some unicellular alginite II grains contain very few nanopores, whereas some aggregated alginite II.host plenty of nanoscale organic pores. Detailed studies on the palynomorphs of macerals suggested that alginite.I is sourced from benthic algae and alginite II are derived from phytoplankton. By comparing the development of.organic pores in different palynomorphs, it was concluded that palynomorphs derived from different algae.precursors and with distinct hydrocarbon potentials and hydrocarbon-generating characteristics affect the development.of organic pores in alginite macerals in the over-mature stage.
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影响因子：
4.2
作者：
Yong Ma;N. Zhong;Lijun Cheng;Z. Pan;Na Dai;Zhang Yu;Liu Yang
通讯作者：
Yong Ma;N. Zhong;Lijun Cheng;Z. Pan;Na Dai;Zhang Yu;Liu Yang
西藏羌塘盆地下白垩统黑色页岩的有机地球化学和岩石学：对油气潜力的启示
影响因子：
3
作者：
Yang Ruofei;Cao Jian;Hu Guang;Fu Xiugen
通讯作者：
Fu Xiugen
影响因子：
2.7
作者：
Siyi Fu;Zhiwei Liao;A. Chen;Hongde Chen
通讯作者：
Siyi Fu;Zhiwei Liao;A. Chen;Hongde Chen
有机质对成熟湖相富有机质页岩孔隙结构的影响——以鄂尔多斯盆地三叠系延长页岩为例
影响因子：
7.4
作者：
Li, Jing;Zhou, Shixin;Li, Chengcheng
通讯作者：
Li, Chengcheng
影响因子：
4.2
作者：
Huijuan Guo;Ruliang He;W. Jia;P. Peng;Yuhong Lei;Xiaorong Luo;Xiangzen Wang;Lixia Zhang;
通讯作者：
Huijuan Guo;Ruliang He;W. Jia;P. Peng;Yuhong Lei;Xiaorong Luo;Xiangzen Wang;Lixia Zhang;