鄂尔多斯盆地镇北地区长8油层组砂岩成岩相与优质储层分布  

Diagenetic Facies and High Quality Reservoir Distribution of Chang 8 Sandstones in Zhenbei Area of Ordos Basin

作　　者：吕成福[1] 付素英[2] 李晓峰 李伟[1] 李超[1] 杜贵超[1] 陈吉[1] 

机构地区：[1]中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]大港油田集团公司地质录井公司,天津300280 [3]中国石油天然气勘探开发公司,北京100034

出　　处：《石油天然气学报》2011年第7期1-6,6,共6页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2008ZX05025-006)

摘　　要：通过运用铸体薄片鉴定、扫描电镜、X-射线衍射和压汞分析等测试手段,对鄂尔多斯盆地镇北地区长8油层组砂岩的成岩相特征和优质储层分布进行了分析。结果表明,该区长8油层组储层以岩屑质长石砂岩为主,结构成熟度和成分成熟度较低,储层表现为低-特低孔、特低渗特征,压实作用和方解石胶结作用是导致该储层物性较差的主要因素。根据成岩作用特征及其对储层物性的影响,在研究区共划分出4种成岩相带,抗压实-溶蚀孔隙相是优质储层发育的有利区,绿泥石胶结残余粒间孔隙相是次有利成岩相带,而压实致密相和方解石胶结致密相不利于储层的发育。The characteristics of diagenetic facies and the distribution of high quality reservoirs of Chang 8 sandstones in Zhenbei Area of Ordos Basin were analyzed by using various testing methods,such as identification of casting thin sections,electron scanning microscope,X-ray diffraction and mercury intrusion method.The research results indicate that Chang 8 reservoirs are dominated by lithic arkose and feldspathic lithic sandstones,textural maturity and compositional maturity of sandstones are low.The Chang 8 reservoirs are characterized by low-extra-low porosity and extra-low permeability.Compaction and calcite cementation are major factors inducing poor reservoir properties.Four kinds of diagenetic facies are classified in Zhenbei Area on the basis of diagenetic characteristics and influence of diageness on reservoirs,compaction resisting-dissolution pore diagenetic facies zone is the most favourable area for development of high quality reservoirs;the chlorite cementation-residual pore diagenetic facies zone is the second favorable diagenetic facies zone;compaction dense diagenetic facies and calcite cementation dense diagenetic facies are disadvantageous to the development of reservoirs.

关 键 词：成岩相 成岩作用 长8储层 镇北地区 鄂尔多斯盆地 

分 类 号：P618.13[天文地球—矿床学]