鄂尔多斯盆地华庆地区长8段成岩主控因素及其对储层的影响  

Major controlling factors of diagenesis and their influences on Chang-8 section reservoir,Huaqing area,Ordos Basin

作　　者：惠学智 许有为 吕娜娜 宋喆 魏小东 刘超[2,3] HUI Xue-zhi;XU You-wei;LYU Na-na;SONG Zhe;WEI Xiao-dong;LIU Chao(No.10 Oil Production Plant of Changqing Oilfield Branch,PetroChina,Qingyang 745100,Gansu,China;Key Laboratory of Sedimentary Basin and Oil and Gas Resources,Ministry of Land and Resources,Chengdu 610081,China;Chengdu Center,China Geological Survey.Chengdu 610081,China)

机构地区：[1]中国石油长庆油田分公司第十采油厂,甘肃庆阳745100 [2]国土资源部沉积盆地与油气资源重点实验室,成都610081 [3]中国地质调查局成都地质调查中心,成都610081

出　　处：《世界地质》2019年第4期1012-1020,共9页World Geology

基　　金：国土资源部沉积盆地与油气资源重点实验室开放基金(cdcgs2018004)

摘　　要：利用微区原位同位素测试、流体包裹体均一化测温、X-射线衍射矿物分析和阴极发光薄片观察与统计等分析手段,系统分析了华庆地区长8段储层岩石学及物性特征,探讨了储层发育的成岩控制因素。结果表明:早期压实作用是长8段低成熟度砂岩原生孔隙降低的重要原因;两期碳酸盐胶结物的广泛发育显著降低了储集孔隙;呈薄膜发育的绿泥石未能有效保护孔隙,自生黏土矿物也是孔隙减少的因素;自生石英填充于溶蚀微孔或附着于颗粒表面,在一定程度上对储层物性产生影响;长8段储层缺乏溶蚀流体的流动空间,碎屑颗粒或前期形成的胶结物未能发生广泛溶蚀,是该区砂岩储集物性较差的另一重要原因。In this study,the authors discuss the diagenetic controlling factors on reservoir development of the Chang-8 section,Huaqing area,on the basis of systematic studies of petrology and reservoir properties,using micro-area,in-situ isotope analysis,homogenization temperature measurement,X-ray diffraction mineral analysis,cathode luminescence observation and coupled with regular thin-section analysis.The results indicate that the early compaction exerting on the low-maturity sandstone of the study area results in dramatic primary porosity decrease.Wide occurrence of two-stage carbonate cementation largely decreases reservoir property,and thin-film chlorite does not protect primary porosity effectively,authigenic clay mineral cementation also contributes to porosity loss.The authigenic quartz filling in dissolution micropores or coating to particle surface causes porosity decrease at certain extent.Moreover,the dissolution of grains or cement does not occur widely due to lack of flowing pathways for dissolving fluids,which is another major cause for low reservoir quality in the study area.

关 键 词：鄂尔多斯盆地 华庆地区 长8段储层 碳酸盐胶结 黏土矿物胶结 成岩控制作用 

分 类 号：P589.1[天文地球—岩石学] P618.130[天文地球—地质学]