松辽盆地白垩系青山口组泥岩微观孔隙特征  

Characteristics of micropores in mudstones of the Cretaceous Qingshankou Formation,Songliao Basin

作　　者：黄振凯[1,2,3] 陈建平[1,2,3] 王义军[4] 薛海涛[5] 邓春萍[1,2,3] 王民[5] 

机构地区：[1]提高石油采收率国家重点实验室,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]中国石油天然气集团公司油气地球化学重点实验室,北京100083 [4]大庆油田有限责任公司第一采油厂,黑龙江大庆163000 [5]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《石油学报》2013年第1期30-36,共7页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.41172134);国家重点基础研究发展计划(973)项目(2011CB211701);中国石油天然气股份有限公司科技攻关项目(2011A-0203)资助

摘　　要：以松辽盆地白垩系青山口组一段泥岩为研究对象,综合利用扫描电镜、场发射电镜、气体吸附法及高压压汞法对其内部微观孔隙进行了定性和定量研究。结果表明该套泥岩主要发育5种类型孔隙(基质晶间孔隙、粒间孔隙、有机质孔隙、晶内孔隙、溶蚀孔隙)以及微米—纳米级微裂缝。泥岩孔隙主要以微孔和介孔为主,孔容为0.001 8～0.030 0 mL/mg,比表面积为0.91～31.02 m2/g,孔隙度较低,为1.20%～3.87%。岩石的组成成分和含量在一定程度上控制了孔隙的发育和分布。孔隙度随有机质、伊利石及黄铁矿含量的增加而增大,随绿泥石以及石英、方解石、斜长石含量的增加而降低,而与高岭石含量相关性差,表明孔隙度的大小可能不受高岭石的影响。This paper deals with mudstone sampled from the first member of the Cretaceous Qingshankou Formation in the Songli- ao Basin. We qualitatively and quantitatively investigated characteristics of its micropores using scanning electron microscope （SEM） , field-emission SEM （FE-SEM） , gas adsorption and high-pressure mercury-injection methods. The results indicate that there are mainly five pore types in the mudstone, including matrix intercrystal, organic, dissolution, intergranular and intracrys- tal pores as well as micron to nano microfissures. Pores in the mudstone are mainly composed of mieropores and meso-pores with pore volume generally ranging from 0. 001 8 to 0. 030 0 mL/mg, specific surface area from 0. 91 m2/g to 31. 02 m2/g and poros- ity from 1. 2% to 3. 9%. It is believed that compositions and concentrations of various minerals in the mudstone determine, to a certain extent, development of micropores. For instance, the mudstone porosity increases with increasing content of organic mat- ter（OM） , illite or pyrite but decreases with increasing content of chlorite, quartz, calcite or anorthose. Moreover, the mudstone porosity has a poor correlation with content of kaolinite, indicating that abundance of kaolinite may not affects variations of mud- stone porosity.

关 键 词：微观孔隙 孔容 比表面积 孔隙度 泥岩 青山口组 松辽盆地 

分 类 号：TE112.221[石油与天然气工程—油气勘探]