摘要
沙河街组二段是辽河盆地西部凹陷的主力含油层系 ,以扇三角洲前缘砂体为主要储集体 ,其油气的富集程度除与丰富的油源条件和良好的圈闭条件有关外 ,主要取决于沉积和储层条件。不同的沉积微相和沉积水动力条件 ,形成的砂岩粒级、分选性及孔隙结构不同 ,原生孔隙发育条件不同 ;埋藏过程中所发生的各种成岩作用进一步改变或改造着扇三角洲相砂体的储集性能。压实、胶结等破坏性改造使储层孔、渗性明显降低 ;溶解、溶蚀等建设性改造有利于深层储层储集性能的改善。本文探讨了原始沉积条件、成岩作用与储集性能及其与含油气性的关系 ,并进行了储层综合评价和有利储层预测 。
The second member of Shahejie Formation in Yuanshuang area is one of the main oil bearing series in the West Depression of Liaohe Basin. The main oil reservoir is fan delta front sandbodies. Sedimentary and reservoir properties controlled oil and gas accumulation. Different sedimentary microfacies and hydrodynamics resulted in different grainsize,sorting and pore structure of sandstone. The diagenesis during deep burial period changed the reservoir characters of fan delta sandbodies to some extent. Compaction and cementation reduced the porosity and permeability of the reservoir,and dissolution obviously improved the porosity and permeability. The relationships between oil/gas bearing properties with original depositional condition, diagenesis and reservoir property are studied in this paper. Comprehensive evaluation and prediction of advantageous reservoir are carried out. The study results can direct the exploration of the study area greatly.
出处
《古地理学报》
CAS
CSCD
2001年第3期76-82,共7页
Journal of Palaeogeography：Chinese Edition
关键词
辽河盆地
西部凹陷
沙二段
储层评价
储层预测
Liaohe Basin, West Depression, the second member of Shahejie Formation, fan delta sandbody, reservoir evaluation and prediction
