渝东南地区彭页1井泥页岩微观孔隙结构特征  

Shale Microscopic Pore Structure Characterization in Well Pengye 1 of Southeast Chongqing

作　　者：苑丹丹 卢双舫 陈方文 肖红 吴逸豪 

机构地区：[1]中国石油大学,山东青岛266580 [2]中国石油华北油田分公司,河北任丘062552

出　　处：《特种油气藏》2016年第1期49-53,91,共6页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金"页岩气储层孔隙微观特征及其定量表征研究"(41302101);"页岩的成储机理及页岩油的可流动性研究--以松辽盆地;济阳坳陷为例"(41330313);国家油气重大专项"资源评价参数选取及天然气资源评价"(2011ZX05007-001)共同资助

摘　　要：针对渝东南地区泥页岩储层微观孔隙结构认识不清的状况,应用氩离子剖光扫描电子显微镜、压汞、低温N2吸附解吸等方法,对渝东南地区下志留统龙马溪组海相泥页岩储层微观孔隙类型及其特征进行研究。结果表明:泥页岩样品中主要发育微裂缝、微孔道、絮状物孔隙、晶间孔、晶内孔、有机质孔隙和生物化石内孔隙等孔隙类型,其中微裂缝、微孔道和絮状物孔隙等微观孔隙相互连通,构成了页岩气储层主要的渗流运移通道;龙马溪组海相泥页岩样品孔隙形态多变,具有平行壁的狭缝状孔隙特征,且具有裂缝性孔隙特征,以开放型孔隙为主;其孔径分布范围广,从纳米级到微米级均有发育,纳米级孔隙和微米级孔隙分别提供0.95%和1.60%的孔隙度。该研究结果为下一步研究页岩气的赋存状态以及储集性能提供依据。shale gas reservoirs in Southeast Chongqing are characterized by unclear understanding of microscopic structure. Argon-ion polish scanning electron microscope,mercury injection,low- temperature N2adsorption- desorption and other methods are used to characterize the microscopic pore structure of the Lower Silurian Longmaxi marine shale in Southeast Chongqing. Result illustrates that the main pores in shale samples include microcracks,microchannels,intergranular pores,intragranular pores,organic pores,fossil pores,etc. The microcracks,microchannels and floc pores are interconnected,which provide main flow channels to shale gas.Longmaxi marine shale samples are featured by various pore morphologies,slit- like pore with parallel walls and fractured pore.Open pores are the dominant part with wide range of pore size from nanometer scale to micron scale. 0. 95% and 1. 60% of porosity are respectively contributed by the nanopore and micropore. The research could provide a basis for the further study on shale gas occurrences and reservoir performance.

关 键 词：泥页岩 孔隙结构 N2吸附 高压压汞 彭页1井 龙马溪组 渝东南地区 

分 类 号：TE123.1[石油与天然气工程—油气勘探]