威信凹陷龙马溪组页岩成藏条件分析  

Analysis of Shale Reservoir Forming Condition of Longmaxi Formation of Weixin Sag

作　　者：冀昆[1,2] 郭少斌[1] 余春昊 毛文静[1] 姜黎明 李新 曹先军 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石油集团测井有限公司技术中心,西安710075

出　　处：《地质科技情报》2017年第3期130-136,共7页Geological Science and Technology Information

基　　金：中国石油股份公司重大科技专项"深层高温高压测井岩石物理与成像评价技术研究"(2014E-3205)

摘　　要：下志留统龙马溪组是威信凹陷页岩气重点勘探评价层系之一。以威信凹陷下志留统龙马溪组为研究对象,通过5口井的孔渗、比表面、X衍射矿物分析、有机质含量、镜质体反射率、三轴应力实验和常规测井以及ECS测井数据分析了该页岩储层的地球化学特征、储存能力、矿物成分以及储层力学特性。结果表明:与北美及四川礁石坝页岩比较,该页岩储层有机质丰度一般,成熟度高,地球化学特征有利于大量生烃;吸附性较好,孔渗性较低,表现出较好的存储特性和较差的物性;脆性矿物含量适中,杨氏模量适中,但泊松比较小,储层表现出较好的脆性;在纵向上,龙马溪组下部泥岩层具有较大的w(TOC)值与较好的孔渗特性,且脆性矿物含量普遍高于上部,较上部表现出更好的开发潜力。Silurian Longmaxi Formation of Weixin Sag in the Dianqianbei Depression is one of the two prin- ciple exploration targets in Weixin Sag. This paper studies Longmaxi Formation through the experiment data of porosity, permeability, X-ray diffraction etc. The result shows that, compared with shale gas of North America and Jiaoshiba in Shichuan Province, this shale reservoir has richer organic content and higher organic maturity with good gas generation potential. This shale reservoir has good adsorption ca- pacity, low porosity and permeability, and so has good storage capacity and poor physical properties. This reservoir has moderate brittle mineral content, moderate Youngrs modulus, and low Poissonls ratio. While the lower part of Longmaxi Formation has greater organic content, better porosity and permeability, and higher brittle mineral content, and so has greater exploration capacity.

关 键 词：威信凹陷 页岩气 龙马溪组 地球化学特征 含气量 脆性 

分 类 号：P618.12[天文地球—矿床学]