辽河西部凹陷鸳双地区沙二段储层评价及有利储层预测

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油气储集体，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，主要取决于沉积储层条件。不同的沉积微相，沉积水体条件不同，形成的砂体粒级、分异性及孔隙结构不同，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。探索原始沉积条件、成岩作用与储集性能及含油气性的关系，并进行综合评价和有利储层预测，对研究区油气勘探起到了重要的指导作用。

RESERVOIR EVALUATION AND PREDICTION OF THE SECOND MEMBER OF SHAHEJIE FORMATION AT YUANSHUANG AREA IN WEST DEPRESSION OF LIAOHE BASIN

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.