鄂尔多斯盆地富县-黄陵县地区上三叠统延长组长6、长7浊积岩成岩作用  

Diagenesis of Chang 6 and Chang 7 turbidite reservoirs of the Upper Triassic Yanchang Formation in Fuxian and Huangling areas,Ordos Basin

作　　者：冯娟萍[1] 王若谷[2] 尚婷[2] 

机构地区：[1]西安科技大学地质与环境学院.陕西西安710054 [2]延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《地质通报》2013年第9期1477-1483,共7页Geological Bulletin of China

基　　金：陕西省教育厅专项科研计划项目(编号:09JK567)

摘　　要：根据砂岩薄片、铸体薄片、扫描电镜、压汞等分析,对富县—黄陵县地区上三叠统延长组长6及长7油层组的浊积岩岩石学特征、成岩作用类型及其对孔隙的影响进行了研究。研究结果表明,该区长6及长7浊积岩主要为细粒长石砂岩。压实作用、胶结作用、交代作用和溶解作用是控制浊积岩储层物性演化的主要成岩作用,其中压实作用和胶结作用强烈破坏了浊积岩的原生孔隙,它们造成的平均孔隙度丧失分别为23.1%和6.5%,但早成岩阶段绿泥石薄膜的形成使浊积岩的一些原生孔隙得以保存。溶解作用和交代作用有效地改善了浊积岩的孔隙结构,从而提高了浊积岩储层的孔渗条件。Based on the data analysis of thin-section, casting lamella, scan electronmicroscope and intrusive mercury etc, the character- istics of lithology and diagenesis are researched on the Upper Triassic Chang 6 and Chang 7 turbidite reservoirs and analyzed their in- fluence on the reservoirs quality of Fuxian and Huangling areas in Ordos Basin. It is shown that the sandstones are granule arkose, which were formed by four types diagenesis that were compaction, cementation, metasomatism and dissolution. It is suggested that the compaction and cementation resulted in lossing primary porosity of the turbidites, and the porosity loss caused by compaction and ce- mentation are 23.1% and 6.5%, respectively. But due to thin film of chlorite occurred around clastic granules, a part of primary inter- granular pore were preserved, and a large of secondary pore were formed with dissolution and metasomatism, which improved the reservoir quality for the turbidites.

关 键 词：富县一黄陵县地区 上三叠统延长组 浊积岩 成岩作用 储层物性 

分 类 号：P534.51[天文地球—古生物学与地层学]