鄂尔多斯盆地中东部山2段储集层岩性微观特征差异性的地质意义  

Difference of reservoir microscopic features of the quartz sandstone and litharenite of the 2^(nd) Member of Shanxi Formation,Upper Paleozoic in middle east Ordos Basin

作　　者：刘锐娥[1] 孙粉锦[1] 卫孝锋[1] 单秀琴[1] 赵虹[2] 蔺洁[1] 

机构地区：[1]中国石油勘探开发研究院廊坊分院 [2]长安大学

出　　处：《石油勘探与开发》2005年第5期56-58,共3页Petroleum Exploration and Development

基　　金：国家"十五"重点科技攻关项目"鄂尔多斯盆地和四川盆地川东复杂低渗气田勘探技术研究"(2001BA605A04);国家(973)项目"多种能源矿产共存成藏(矿)机理与富集分布规律"(2003CB214602)

摘　　要：通过大量薄片观察、扫描电镜、阴极发光等分析,并结合储集层物性、压汞等分析资料,研究鄂尔多斯盆地中东部山2段石英砂岩与岩屑砂岩微观储集特征的差异。石英砂岩石英含量高,杂基和软岩屑含量低,几乎不含长石;岩屑砂岩则石英含量低,杂基和软岩屑含量高,普遍含少量长石。根据石英砂岩与岩屑砂岩的石英颗粒表面特征的显著差异分析,石英砂岩是清水高能化学环境的沉积,沉积速率缓慢,具有以粒间孔为主的复合型孔隙组合,储集性好,勘探前景广阔;岩屑砂岩是混水低能、地表化学作用较弱环境的沉积,沉积埋藏作用迅速,孔隙发育差,仅见少量粒内溶孔,储集性差,勘探效益不明显。By the analysis of a lot of slice-observing, SEM and cathode luminescence, combining with the physical property of reservoir and the mercury intrusion curve, the difference of reservoir microscopic features between quartz sandstone and litharenite of 2^nd Member of Shanxi Formation, Upper Paleozoic, middle east Ordos Basin, indicates that the quartz sandstone has the high quartz, low matrix, low soft lithoclast and few feldspar,and that the litharenite has the property of low quartz, high matrix, high soft lithoclast and a little feldspar. The obvious surface difference between the quartz sandstone and litharenite shows that the quartz sandstone is deposited slowly in clear water and high energy environment, and it possesses a complex porosity combination and gives priority to intragranular pores, it has broad prospects for explorations. The litharenite is the sediment of mixed water, low energy environment and weak chemical effett of the earth＇s surface, is quickly buried, with bad porosity, few intragranular solution void and poor reservoir property, and a poor prospecting.

关 键 词：微观储集特征 石英砂岩 岩屑砂岩 山2段 鄂尔多斯盆地 

分 类 号：TE122.23[石油与天然气工程—油气勘探]