摘要
在前人研究的基础上,就鄂尔多斯盆地陕北斜坡构造单元三叠系延长组长6成岩作用类型分布及其影响因素做了简要总结和分析。整个区域长6期发育机械压实作用、胶结作用和溶蚀作用,低孔低渗储层的形成主要受到强烈机械压实作用的影响,绿泥石膜环边在抵抗压实作用,保护原生孔隙起到了关键性的作用,在全区各个部位都有分布。溶蚀作用是对改善研究区储层物性做出最大贡献的成岩作用。成岩作用受岩性、沉积微相和鼻状隆起构造的影响,其中,三角洲水下分流河道微相储层砂体发育,物性好,机械压实和胶结作用较弱;长石多少为后期溶蚀作用发生提供充足的物质基础,鼻状隆起影响油藏类型的同时影响成岩作用的发生。
On the basis of previous studies,diagenetic type distribution and its influence factors of Chang 6 reservoir of Triassic Yanchang formation in Northern Shaanxi slope structure unit of Ordos basin were summarized and analyzed.The results show that all the study area has developed compaction,cementation and denudation.The formation of low porosity and low permeability reservoir is mainly affected by the strong mechanical compaction.The chlorite rims play a key role in resisting compaction to protect primary porosity.Denudation is the biggest contribution to improve the reservoir physical properties.The diagenesis is affected by lithologic,sedimentary microfacies and nose-shaped uplifts.Distributary channel of delta front is the best microfacies for the reservoir development,has good physical properties,poor compaction and cementation;Feldspar provides sufficient material basis for later corrosion;The nose-shaped uplifts affect reservoir types and diagenesis.
出处
《辽宁化工》
CAS
2013年第7期812-815,共4页
Liaoning Chemical Industry
