姬塬油田麻黄山地区长4+5和长6储集层敏感性差异评价  

Evaluation on Sensitivity Difference Between Chang 4+5 and Chang 6 Reservoirs in Mahuangshan Area of Jiyuan Oilfield

作　　者：宋雨纯 黄昊 周创飞 柯先启 唐号迪 朱玉双[1,2] SONG Yuchun;HUANG Hao;ZHOU Chuangfei;KE Xianqi;TANG Haodi;ZHU Yushuang(Northwest University,State Key Laboratory of Continental Dynamics,Shaanxi 710069,China;Northwest University,Department of Geology,Xi’an,Shaanxi 710069,China;PetroChina Changqing Oilfield Company,No.11 Oil Production Plant,Xi’an,Shaanxi 710021,China;PetroChina Changqing Oilfield Company,No.6 Oil Production Plant,Xi’an,Shaanxi 710200,China;PetroChina Changqing Oilfield Company,No.5 Oil Production Plant,Xi’an,Shaanxi 710200,China)

机构地区：[1]西北大学大陆动力学国家重点实验室,西安710069 [2]西北大学地质学系,西安710069 [3]中国石油长庆油田分公司第十一采油厂,西安710021 [4]中国石油长庆油田分公司第六采油厂,西安710200 [5]中国石油长庆油田分公司第五采油厂,西安710200

出　　处：《新疆石油地质》2022年第5期546-553,共8页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2017ZX05008-004-004-001);国家自然科学基金(41972129)。

摘　　要：为避免储集层敏感性伤害,提高油田采收率,进行姬塬油田麻黄山地区长4+5和长6储集层的敏感性差异研究。在对研究区岩石学特征、物性特征和孔喉结构特征研究的基础上,用岩心开展敏感性实验,对研究区长4+5和长6储集层的敏感性进行评价,并分析造成长4+5和长6储集层敏感性差异的原因。结果表明,姬塬油田麻黄山地区长4+5和长6储集层以岩屑长石砂岩为主;长4+5和长6储集层的平均孔隙度分别为10.6%和9.4%,平均渗透率分别为0.65 mD和0.25 mD,平均面孔率分别为6.84%和3.67%;研究区长4+5和长6储集层总体上均具有弱速敏、弱水敏、弱盐敏、强酸敏和强碱敏的特点;由于长4+5储集层长石和石英含量较高,高岭石含量较低,其碱敏性和水敏性较长6储集层强;长6储集层则因为黏土矿物含量较高,其盐敏性和酸敏性较长4+5储集层强。在后续的储集层改造中,应严格控制注入地层流体的pH值。In order to avoid sensitivity damage and improve oil recovery,the sensitivity difference between Chang 4+5 and Chang 6 reservoirs in Mahuangshan area of Jiyuan oilfield was studied.Based on the analysis of petrology,physical properties and pore-throat structures of the reservoirs in the study area,sensitivity experiments were carried out with cores,then the sensitivities of Chang 4+5 and Chang 6 reservoirs in the study area were evaluated,and the causes for the sensitivity differences between Chang 4+5 and Chang 6 reservoirs were analyzed.The results show that the Chang 4+5 and Chang 6 reservoirs are dominated by lithic feldspar sandstone,and have the average porosity of 10.6%and 9.4%,the average permeability of 0.65 mD and 0.25 mD,and the average surface porosity of 6.84%and 3.67%,respectively.The Chang 4+5 and Chang 6 reservoirs are generally characterized by weak velocity sensitivity,weak water sensitivity,weak slat sensitivity,strong acid sensitivity and strong alkali sensitivity.The Chang 4+5 reservoir exhibits stronger alkali sensitivity and water sensitivity than the Chang 6 reservoir,for its high content of feldspar and quartz and low content of kaolinite,while the Chang 6 reservoir has stronger salt sensitivity and acid sensitivity than the Chang 4+5 reservoir,for its high content of clay minerals.In the subsequent reservoir stimulation,the pH value of the injected fluid to formation should be strictly controlled.

关 键 词：鄂尔多斯盆地 姬塬油田 麻黄山地区 延长组 储集层 敏感性 储集层保护 

分 类 号：TE112.23[石油与天然气工程—油气勘探]