苏里格气田桃7区块盒8段、山1段储层特征

桃7区块是四川石油管理局与长庆油田公司在苏里格气田进行油气合作勘探开发的重点区块之一，油气勘探开发成效显著。为此，对该区块主要产层上古生界二叠系盒8段、山1段的储集岩发育的沉积相、储层岩性及物性、储层分布特征进行了研究。结果认为：桃7区块盒8段、山1段储集砂岩为粒度粗、质较纯的（含砾）粗粒-中粒岩屑砂岩；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-小孔喉、分选中等、排驱压力高和主贡献喉道小的特点；储层具低孔隙度、低渗透率特征，非均质性强；横向上连续性较差，纵向上多套储层交错叠置，投影在平面上形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，是有利的勘探部位。

CHARACTERISTICS OF RESERVOIRS AT HE-8 AND SHAN-1 MEMBERS IN BLOCK TAO-7 OF SULIGE GAS FIELD

The block Tao 7 is one of the major blocks in Sulige gas field that are successfully explored and developed jointly by CNPC Sichuan Petroleum and PetroChina Changqing Oilfield Company. This paper studies the sedimentary facies, lithologic and petrophysical properties, and distribution of the reservoirs in the He 8 and Shan 1 members of the Permian, which are the main pay zones in this block, and obtains the following understandings. The reservoirs at the He 8 and Shan 1 members are composed of relatively clean coarse to medium grained lithic sandstones (conglomeratic). The reservoir spaces are dominated by secondary intergranular and intragranular dissolved pores and relic intergranular pores, with fractures being underdeveloped, thus the reservoirs are of pore type. The pore structures are characterized by medium to small throat, moderate sorting, high displacement pressure and small major throat. The reservoirs show the characters of low porosity and low permeability, strong heterogeneity, poor lateral continuity and complicated vertical superimposition. The N S trending wide string of composite reservoirs is relatively enriched in gas, thus is favorable for exploration.