摘要
为了确保四川盆地川西气田中三叠统雷口坡组气藏的开发效果,以该气田为研究对象,综合薄片、压汞、测试等资料,分析了储层特征、气水分布等影响开发效果的核心地质因素,确定了开发技术对策。研究结果表明:①该气田处于龙门山前逆冲推覆构造带,构造为北东—南西向展布的长轴状断背斜,呈北高南低的格局,金马构造及鸭子河构造翼部层间小断层和彭县断层伴生小断层较发育;②沉积相为潮坪相,沉积亚相主要为潮间—潮下带亚相,有利沉积微相为云坪、藻云坪,横向展布相对稳定;③储层为白云岩薄互层,具有“千层饼”特征,纵向分为上下两段,具有上薄、下厚的特征,整体表现为低孔隙度、低渗透率特征,储集空间可分为溶蚀孔隙、溶蚀孔洞和微裂缝3种类型;④气藏由北向南不同构造的气水界面逐步降低,呈北高南低分布。结论认为:①按照效益优先、少井高产、有效接替、持续稳产的原则,以构造高部位为优先建产主体目标区,采用一套开发层系,以下储层为主,兼顾上储层,局部细分层系;②该气田处于人口稠密区,采用丛式井组,集中部署大位移、长靶间距大斜度井,提高单井产能和储量动用程度;③优化不同类型气井合理产量,确保边水整体均衡推进;④在主体区进入稳产末期,外围有序接替,实现气藏长期稳产,进一步提高了气藏采收率。
Taken western Sichuan gasfield as an example,such critical geological factors as reservoir characteristics and gas-water distribution affecting development benefits were analyzed on the basis of thin-section,mercury-injection and test data to make development technological strategies in an effort to assure gas reservoirs of Leikoupo Formation in west⁃ern Sichuan Basin with benefits.Results show that(i)this field is located in the thrust nappe structure belt of Longmen⁃shan piedmont,which is structurally a NE-SW trending long-axis faulted anticline,emerging as a framework of north high and south low.There developed interlayer minor faults and other minor faults accompanying with Pengxian fault respective⁃ly at flanks of Jinma and Yazihe structures;(ii)there are tidal-flat sedimentary facies whereas mainly intertidal-subtidal subfacies deposited in this area with dolomitic flat and algae dolomitic flat as the favorable microfacies featured by a sta⁃ble lateral extension;(iii)as a sort of thin dolomite interlayer with the characteristics of overlap-maps,these reservoirs are vertically able to be divided into two members,namely upper thin and the lower thick.They character low porosity and permeability.And their space can be classified into three types of dissolved pore and vug as well as microfracture;and(iv)the gas-water contact within the reservoirs descends gradually in different structures southwards,being distributed like the pattern of north high and south low.Four conclusions are made,the first is to take structural highs as the priority target zone of productivity construction,to adopt one suite of development series with the lower reservoir as the principal while taking of the upper one into consideration,and to subdivide the series locally in line with the principles of"benefits first,fewer wells with high production,effective replacement,and continuous stable production";the second to adopt cluster wells and deploy intensively reach-extended wells,and long target spacing and highly deviated wells in this gasfield even at a densely populated area in order to raise single-well productivity and reserve-producing degree;the third to optimize the reasonable production rate in different types of wells so as to ensure an overall uniform advancement of edge water;and the last to provide ordered replacement in the periphery when the main area stepping into the final stable-production phase in an effort to realize these gas reservoirs in the long-term stable production and further enhance their recovery fac⁃tor.
作者
张岩
王琼仙
邓美洲
高恒逸
丁蔚楠
敬永红
刘凤
刘沙
胡腾
罗丹序
苏娜
刘叶
ZHANG Yan;WANG Qiongxian;DENG Meizhou;GAO Hengyi;DING Weinan;JING Yonghong;LIU Feng;LIU Sha;HU Teng;LUO Danxu;SU Na;LIU Ye(Exploration and Development Research Institute,Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan 610041,China;Geo-logical Central Laboratory,Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan 610081,China)
出处
《天然气技术与经济》
2023年第4期14-21,共8页
Natural Gas Technology and Economy
关键词
川西气田
雷口坡组
潮坪相
边水气藏
大斜度井
差异化配产
动态监测
Western Sichuan gasfield
Leikoupo Formation
Tidal-flat sedimentary facies
Edge-water gas reservoir
High⁃ly deviated well
Differentiating allocation
Dynamic monitoring
作者简介
张岩(1978-),高级工程师,从事油气藏评价与开发方面的研究工作。E-mail:396488278@qq.com。
