鄂尔多斯盆地大牛地气田山二段致密砂岩储层特征及评价  

RESERVOIR CHARACTERISTICS AND EVALUATION OF LOW POROSITY AND PERMEABILITY SANDSTONE OF MEMBER Ⅱ OF SHANXI FORMATION IN DANIUDI GAS FIELD,ORDOS BASIN

作　　者：万旸璐[1,2] 李仲东[2,3] 彭超[4] 孔为[2,3,4] 谢云欣[2,3] 郑婷[5] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,无锡石油地质研究所,江苏无锡214126 [2]“油气藏地质及开发工程”国家重点实验室(成都理工大学),四川成都610059 [3]成都理工大学能源学院,四川成都610059 [4]中海油能源发展股份有限公司工程技术分公司,天津300457 [5]中国石化集团绿源地热能开发有限公司,陕西咸阳712000

出　　处：《矿物岩石》2016年第3期106-114,共9页Mineralogy and Petrology

基　　金：国家“十二五”科技重大专项(2011ZX05045-01)

摘　　要：根据沉积微相、储层宏观和微观特征等多种参数,针对鄂尔多斯盆地大牛地气田山西组山二段致密砂岩储层特征进行研究。结果表明:大牛地气田下二叠统山西组山二段辫状河三角洲平原砂岩储层以岩屑砂岩和岩屑石英砂岩为主,成分成熟度中等,结构成熟度偏高。砂岩孔隙度主要分布区间为2%~14.11%,平均孔隙度为4.65%,渗透率主要分布区间为0.02×10^(-3)μm^2~3×10_(-3)μm^2,平均值0.92×10^(-3)μm^2,研究区砂岩储层成岩作用以机械压实、胶结和溶蚀为主,机械压实以及石英加大和方解石胶结是降低孔隙度的主要成岩作用,砂岩孔隙类型以粒间溶蚀孔隙为主。通过开展储层综合评价,确定各段储层分类标准,将山二段砂岩储层划分为3类,其中Ⅰ类为相对高孔高渗天然气储层,Ⅱ类为相对中等储层,Ⅲ类为较差储层,建立了山二段砂岩储层评价标准体系并刻画了不同级别储层展布特征。The reservoir characteristics and evaluation of low porosity and permeability sand- stone of Member Ⅱ of Shanxi Formation in Daniudi gas field are studied on the basis of research of sedimentary microfacies,microscopic and macroscopic characteristics of reservoirs. It shows that the main components of Member Ⅱ of Shanxi Formation of braided delta are lithic sandstone and lithic quartz sandstone, with compositional maturity of medium level and structural maturity of high level. The porosity and permeability of sandstone range from 2% to 14. 11% and 0.02×10-（-3）μm-2-3×10_（-3）μm-2 , with average value of 4.65 % and 0.92×10-（-3）μm-2 respectively. The reser-voirs experience dlagenesls ol mechanical compaction, cemeniauon as well 8s corrosion, Mechanical compaction,quartZ secondary outgrowth and calcite cementation are the main diagenesis of re- ducing the sandstone porosity,while the intergranular dissolution pore is the major pore type in the rocks. The member Ⅱ of Shanxi Formation can be divided into three types：Type one has rela- tively high porosity and permeability;type two has moderately porosity and permeability and type three has low porosity and permeability. Accordingly,the criteria of the reservoirs of Member Ⅱ of Shanxi Formation is established and the distribution of different levels of reservoir is character- ized.

关 键 词：致密砂岩 山西组山二段 大牛地气田 储层特征 储层评价 

分 类 号：TE122.2[石油与天然气工程—油气勘探]