低孔低渗储层次生孔隙形成机理及分布预测  

Forming Mechanism and Distribution Prediction of the Secondary Pores in Low-porosity and Low-permeability Reservoirs

作　　者：郭殿军[1,2] 王宝辉[1] 

机构地区：[1]大庆石油学院,黑龙江大庆163318 [2]大庆油田有限责任公司第九采油厂,黑龙江大庆163853

出　　处：《中外能源》2010年第5期57-59,共3页Sino-Global Energy

摘　　要：对于低孔、低渗的扶杨油层,次生孔隙的存在能够有效改善渗流条件,提高单井自然产能,使难采储量动用潜力大大提高。分析了低孔、低渗储层次生孔隙形成的主要影响因素:有机酸和碳酸的溶蚀作用,大气水淋滤作用,地层有较高含量的可淋滤矿物,超压、断层活动促使溶解介质从产地向溶解层作较大范围的高速流动。同时,指出了长期继承性发育构造的隆起,集中分布的T2断层,与断层结合较好的水下分流河道、河口坝等沉积微相有利于次生孔隙的连片发育。对大庆长垣西部地区次生孔隙发育有利区进行了预测。预测结果为:齐家北油田、龙23区块为次生孔隙有利发育区,他拉哈地区为次生孔隙较有利发育区,其他酸性流体浓度较高的区块需进一步落实;在密井网条件下,可依据各井区分流河道与河口坝砂体发育情况及碳酸盐含量的多少预测次生孔隙的发育程度。In low-porosity and low-permeability Fuyu-Yangdachengzi oil reservoir,the existed secondary pores can improve the percolation conditions ,and can make natural productivity of single well and produced potential of hard-to-recover reserves enhanced.Main factors of influencing formation of the secondary pores in the low-porosity and low-permeability reservoirs are analyzed.It includes：denudation of organic acid and carbon acid,meteoric-eluviation,higher content of leach mineral in the formations,and large range of high-velocity flow of dissolved medium from place of origin to dissolved layers caused by superpressure and fault active. The uplift among long-term inherited structures ,T2 fault with centralized distribution,and microfacies of subaquatic distributary channel and river mouth bar are considered to be favorable for the stretch growth of the secondary pores.Range of profitability of the secondary pores growth in the west of Daqing placanticline is predicted.The results are：Qijiabei oilfield and block Long23 are most favorable ,and Talaha region is more favorable and other blocks with high concentration of acidic fluid should be probed.At the condition of dense well pattern, the development of the distributary channel and river mouth bar and the content of carbonate in each well block can be applied in the development degree of the secondary pores.

关 键 词：低孔低渗储层 次生孔隙 形成机理 

分 类 号：P618.13[天文地球—矿床学]