川东北MLB地区须二段气藏开发储层特征研究

STUDY ON GAS RESERVOIR CHARACTERISTICS IN THE 2^(ND) MEMBER OF XUJIAHE FORMATION IN SICHUAN MLB AREA

四川盆地东北部MLB地区须家河组二段是一套以岩屑砂岩、石英砂岩为主的致密砂岩储层,近几年来随着勘探、开发上对川内致密砂岩气藏不断突破,尤其是MLB地区的M101的获产,均证实该区致密砂岩储层具有良好的开发潜力。因此针对MLB须二段致密砂岩气藏的特点及开发中存在的问题,综合运用野外露头、钻井岩心、镜下分析等资料开展了储层特征研究。结果表明,有利沉积微相是形成优质储层的基础,成岩作用决定着储层的储集性能,压实作用是破坏孔隙的主要成岩作用,同时裂缝的发育有效改善了储渗性能,形成渗透率相对高的区域,这些区域就是有望获高产的有利区。

The 2nd member of Xujiahe formation is tight sandstone reservoir,which is mainly composed of lithic sandstone and quartz sandstone,and located in the northeast MLB area of Sichuan Basin.With the exploration and development in tight sandstone reservoir in recent years,many development results were achieved.Especially,the production at M101 in MLB area proved that the tight sandstone research in this area had a good development potentiality.Aiming at some development problems in MLB tight reservoir,the reservoir characteristics were analyzed by using the field outcrop,drilling core and microscopic data.The results showed that the favorable sedimentary microfacies were the basis for forming high quality reservoir,the diagenesis determined the reservoirs properties,the compaction effects is the main reason of the pore failure.Meanwhile,development of fractures improved the ability of reserve and permeation.It would lead the high permeability area where might be acquired high production.