苏里格气田东区气层产能贡献差异微观因素分析

Microcosmic factor analysis of yielding difference of major pay in east area of Sulige Gas Field

黎菁¹ 骆建江¹ 张旭阳² 刘鹏³

中国石油天然气集团公司川庆钻探工程公司地质勘探开发研究院，四川 成都 610056 中国石油新疆油田公司百口泉采油厂，新疆 克拉玛依 834000 中国石油西南油气田分公司川西北气矿，四川 江油 621700

Research Institute of Exploration and Development, Chuanqing Drilling and Exploration Engineering Co. Ltd., CNPC, Chengdu 610056, China Baikouquan Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China Gas Field of Northwest Sichuan, Southwest Oil and Gas Company, PetroChina, Jiangyou 621700, China

 苏里格气田是一个低丰度、低压、低渗、非均质性严重的气田，储层条件复杂。砂岩呈大面积连片分布，连续性、连通性较好，有效砂岩为其中相对高渗的Ⅰ，Ⅱ，Ⅲ类储层。盒8、山1段储层的Ⅰ，Ⅱ，Ⅲ类气层产能贡献差异现象极其明显。采用统计分析方法，通过薄片鉴定和样品压汞分析资料对气层微观孔隙结构进行分析对比，以室内产能模拟实验明确苏里格东区盒8、山1多层系产层的不同类型储层产能大小以及产能贡献率。结果表明，Ⅰ类储层对渗透率/产能贡献率高达55%~65%，Ⅱ类储层的贡献率23%~27%，Ⅲ类储层的贡献率8%~15%；储层渗透率、孔隙结构特征的差异是造成Ⅰ，Ⅱ，Ⅲ类气层产能贡献差异的主要原因，合理的开发方式对多层合采低渗油气层的开发具有重要意义。

 Sulige Gas Field is the one with low abundance, low pressure and permeability, serious heterogeneity and complex reservoir condition. The sandstone reservoirs develop into a contiguous area and have good continuity and connectivity. The effective sandstone reservoirs are Class Ⅰ, Ⅱand Ⅲ reservoirs which have relatively high permeability. However, there is a very obvious yielding difference among them. Productivity simulation experiment is made to define the magnitude and contribution rate of productivity of He 8and Shan 1 multilayer reservoirs in east area of Sulige Gas Field. The microscopic pore structure of gas reservoirs is analyzed by using statistical methods, pressure mercury analysis and thin-section identification. The result indicates that the permeability/productivity contribution rate of Class Ⅰreservoir is amount to 55% to 65%, with ClassⅡreservoir of 23%-27% and Class Ⅲ reservoir of about 8%-15%. Further more, pore structure difference is the critical factor to induce the difference of production contribution. Reasonable development mode has an important meaning for the multilayer commingling production of tight sandstone gas reservoir.

10.6056/dkyqt201206019