鄂尔多斯盆地延长组长7段页岩油赋存状态及开发特征  

Occurrence and Development Characteristics of Shale Oil in Chang 7 Member of Yanchang Formation,Ordos Basin

作　　者：张娟 张晓辉 许珍萍 曹青 余林瑶 ZHANG Juan;ZHANG Xiaohui;XU Zhenping;CAO Qing;YU Linyao(College of Earth Science and Engineering,Xi’an Shiyou University,Xi’an,Shaanxi710065,China;Exploration and Development Research Institute,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710021,China;Sichuan Shale Gas Exploration and Development Co.,Ltd.,Chengdu,Sichuan 610000,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]中石油勘探开发研究院,陕西西安710021 [3]四川页岩气勘探开发有限责任公司,四川成都610000

出　　处：《西安石油大学学报（自然科学版）》2023年第1期10-18,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省教育厅科研计划项目资助(21JK0839)。

摘　　要：针对鄂尔多斯盆地长7段页岩油资源潜力大,而采出程度低的问题,通过铸体薄片、荧光薄片及多粒级多极性抽提手段对长7段页岩油赋存状态进行研究,发现不同岩性储集空间中赋存的原油形态各异,页岩油主要赋存于砂岩及泥页岩粒间孔和溶蚀孔中,其中轻质组分在孔隙空间赋存,稍重质组分于矿物及有机质表面赋存。整体上页岩油以游离态为主,细砂岩、粉砂岩、泥质粉砂岩、泥岩、页岩及凝灰岩游离油抽提量平均分别为10.00、3.02、2.38、3.19、5.57和8.64 mg/g。泥页岩中虽然以游离态油为主,但抽提量明显低于细砂岩,且吸附态页岩油组分较砂岩重。研究表明,相比页岩型页岩油,长7段细砂岩、粉砂岩发育的夹层型页岩油开发可取得较好效果。In order to solve the problem of high potential and low recovery of shale oil in the Chang 7 member of Ordos Basin,the occurrence of shale oil in the Chang 7 member was studied by means of casting thin section,fluorescent thin section and multi-grain multipolarity extraction.It is found that the occurrenceforms of shale oil in different lithologic reservoir spaces are different,and it mainly occurs in the intergranular pores and corrosion pores of sandstone and shale.The light components occur in the pore space,and the slightly heavy components occur on the surface of minerals and organic matter.On the whole,shale oil is mainly in the free state,the average extraction amount of free oil from fine sandstone,siltstone,argillaceous siltstone,mudstone,shale and tuff is 10.01,3.02,2.38,3.19,5.57 and 8.64 mg/g respectively.Although oil is mainly in free state in shale,the extraction amount from shale is obviously lower than that from sandstone,and the adsorbed oilcomponent in shale is heavier than that in sandstone.Compared with the shale oil in shale,the interbedded shale oil developed in the fine sandstone and siltstone of Chang 7 can obtain better development effect.

关 键 词：页岩油 赋存状态 多粒度多极性抽提 长7段 鄂尔多斯盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]