苏里格气田苏77区块盒8段、山1段储层特征

Reservoir Characteristics of He8 and Shanl Members of Block Su77 of Sulige Gasfield

对苏77区块主要产层上古生界二叠系盒8段、山1段储层岩性、储集空间及物性特征进行了研究。结果认为：苏77区块储集砂岩为中粗粒岩屑石英砂岩、岩屑砂岩和石英砂岩；储集空间以次生的粒间、粒内溶孔及残余粒间孔为主，裂缝不发育，储集类型为孔隙型；储层孔隙结构具有中一小孔喉，分选中等，中等一较高排驱压力；储层具低孔、低渗的特征，非均质性强，Ⅱ类储层发育；横向上连续性较差，纵向上多套储层交错叠置，平面上构成了南北向宽条带状或大面积连片分布的复合储集体，为天然气相对富集区。是有利的开发部位。

Su-77 block is a co-operated development block in tile Sulige gasfield by the Western Drilling Co. and Changqing Oilfield Company. The block was formally put into production in 2009. So the reservoir lithology, reservoir spaces, and characteristics of the physical properties of the He8 and Shanl Members of Upper Paleo- zoie Permian are studied, which are main producing layers of the block. Conclusions think that： the reservoir sandstone of the Su-77 block is mid-coarse-grained lithic quartz sandstone, lithic sandstone and quartz sand- stone; the reservoir spaces are mainly secondary intergranular, intragranular dissolution pores and residual inter- granular pores. Fractures do not developed there. The type of reservoir is pore-type; the structure of reservoir pores is with small-medium pore-throats, with medium sorting and medium-high displacement pressure; The reservoir is low porosity and low permeability characteristics, with strong heterogeneity and class-II of reservoir development. Horizontally poor continuity, vertically crossing and superimposing/overlaying of muhilayers consti- tute horizontally a north-south distribution of a wide ribbon or a large area of contiguously distributed composite reserwfirs. That＇s a relatively gas-rich region, and a favorable development site.