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川南地区五峰组-龙马溪组黑色页岩储层特征
韩超,吴明昊,吝文,孔祥鑫,姜在兴,高丽华,韩作振
0
(山东科技大学地球科学与工程学院, 山东青岛 266590;路易斯安那州立大学地质与地球物理系, 路易斯安那州巴吞鲁日 70803;中国石油勘探开发研究院廊坊分院非常规油气重点实验室,河北廊坊 065007;中国地质大学北京能源学院, 北京 100083;山东科技大学地球科学与工程学院, 山东青岛 266590;海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛 266071)
摘要:
通过岩心、薄片、X-衍射、扫描电镜、测井等分析测试,对川南地区威远、长宁、昭通三区块五峰组-龙马溪组黑色页岩矿物组分、有机地化、储集空间、物性和含气性特征进行研究,制定页岩岩相划分方案,分析黑色页岩储层控制因素,优选研究区有利储层。结果表明:根据有机组分和无机组分相结合原则制定的岩相划分方案在研究区识别出14种岩相;目的层黑色页岩有机质含量高,均值大于2%,有机质成熟度高,等效镜质体反射率均值为2.5%,处于高成熟阶段;硅质页岩物性和含气性较好,游离气组分含量较高,混合型页岩次之,钙质页岩物性和含气性最差,几乎不含游离气,游离气是导致硅质页岩含气性较好的重要因素;粒间孔隙主要沿石英颗粒发育,多为宏孔,主要发育于硅质页岩中,是造成硅质页岩物性及含气性好、游离气组分含量较高的主要原因;长宁地区主要发育Ⅰ类储层,Ⅰ类和Ⅱ类储层累计厚度可达44.7 m,是研究区页岩气储层最有利区块。
关键词:  川南地区  五峰-龙马溪组  岩相  储层特征  储层评价
DOI:10.3969/j.issn.1673-5005.2017.03.002
投稿时间:2016-11-12
基金项目:国家自然科学基金项目(41372134); 青岛市博士后研究人员应用研究项目(2016127); 青岛海洋科学与技术国家实验室鳌山科技创新计划项目(2016ASKJ13); 高等学校博士学科点专项科研基金项目 (20133718130001) ; 山东科技大学科研创新团队支持计划(2015TDJH101)
Characteristics of black shale reservoir of Wufeng-Longmaxi Formation in the Southern Sichuan Basin
HAN Chao,WU Minghao,LIN Wen,KONG Xiangxin,JIANG Zaixing,GAO Lihua,HAN Zuozhen
(College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA;Research Institute of Petroleum Exploration and Development-Langfang, Unconventional Oil & Gas Laboratory of PetroChina, Langfang 065007, China;School of Energy Resources, China University of Geosciences, Beijing 100083, China;College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China)
Abstract:
Using a series of analyses including core observation, conventional polarization microscope, X-ray diffraction, SEM, and well log, this research studied the mineral composition, organic geochemical features, storage space, physical property and gas-bearing, and categorized the black shale in the study area. The key factors that affect shale gas reservoirs were analyzed, and the favorable area was recognized. The results show that fourteen lithofacies are identified based on our classification. The black shale has a high total organic matter content and high maturity. With a high free gas content, the siliceous shale has the best physical properties and gas-bearing; the next is the mixed shale, and the calcareous shale has the least favorable physical properties and gas-bearing, in which almost no free gas is contained. Free gas is the main factor that affects the total gas content. SEM observations show that interparticle pore mainly develops along quartz in the siliceous shale; and the development of interparticle pore is the key factor that lead siliceous shale to be the best shale reservoirs with better physical property, gas-bearing and high free gas content. In the study area, TOC and lithofacies are the major factors affecting the shale gas reservoir. The transitioning area mainly develops siliceous shale, the total thickness of typeⅠand type Ⅱ reservoirs can reach 44.7 m, which is the most favorable exploration region.
Key words:  Southern Sichuan Basin  Wufeng-Longmaxi Formation  lithofacies  reservoir characteristics  reservoir assessment