粘土矿物对广安须家河组致密砂岩物性影响  

INFLUENCES OF CLAY MINERALS ON PHYSICAL PROPERTIES OF TIGHT SANDSTONES OF XUJIAHE FORMATION IN GUANG'AN AREA

作　　者：宋丽红[1,2] 朱如凯[2] 朱德升[2] 隋少强[3] 周川闽[2] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京海淀100083 [2]"沉积储层重点实验室".中国石油勘探开发研究院石油地质实验研究中心,北京海淀100083 [3]中国石油勘探开发研究院国际项目评价所,北京海淀100083

出　　处：《西南石油大学学报（自然科学版）》2011年第2期73-78,11-12,共6页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家重点基础研究发展计划"973"项目(2007CB209502);国家油气重大专项(2008ZX05001-02)

摘　　要：粘土矿物广泛分布于川中广安地区上三叠统须家河组的各个层段中,是须家河组重要的烃源岩和致密砂岩储集层中的填隙物,对砂岩储集性能起着至关重要的作用。在岩芯铸体薄片鉴定基础上,通过扫描电镜、能谱仪以及X-衍射仪等对砂岩中的粘土矿物进行了全面系统的研究,认为:早成岩期形成的绿泥石薄膜抑制石英次生加大,有效地保护了原生孔,对致密砂岩储层物性具有极其重要的积极意义;自生伊利石在砂岩储层中将原生孔和次生孔分割成无数微孔,在降低有效孔隙的同时,还大大降低了储层的渗透性,是造成川中须家河组储集层低孔低渗特征的重要原因之一;自生高岭石往往预示着次生孔隙发育区带,但在研究区分布有限,仅见于须六段。Clay minerals are widely distributed in the T3x,they are important source rocks and cement in tight sandstones,and they are the main controlling factors of the qualities of reservoirs.Based on the appraisal of the core thin section,clay minerals in sandstone are analyzed comprehensively and systematically by using SEM and X-ray.The result shows that the chlorite rim which is developed in the early stage of diagenesis can prohibit the overgrowth of quartz,so it is very important for the preservation of primary porosity.Authigenic illite seriously reduces porosity and permeability by cutting the primary and second intergranular pores into micro-pores.Authigenic kaolinite often forecasts secondary pore development zones which are only founded in T3x6 member.

关 键 词：粘土矿物 低孔低渗 致密砂岩 须家河组 储层物性 

分 类 号：TE122.2[石油与天然气工程—油气勘探]