三塘湖盆地二叠系凝灰岩致密油勘探开发实践及认识  

Practical experience and understanding of exploration and development of Permian tight tuff reservoir in the Santanghu Basin

作　　者：陈旋[1] 刘俊田[1] 龙飞[1] 刘长地[1] 李兴亮 关中南 宋学良 Chen Xuan;Liu Juntian;Long Fei;Liu Changdi;Li Xingliang;Guan Zhongnan;Song Xueliang(Research Institute of Exploration and Development,PetroChina Tuha Oilfield Company)

机构地区：[1]中国石油吐哈油田公司勘探开发研究院

出　　处：《中国石油勘探》2019年第6期771-780,共10页China Petroleum Exploration

基　　金：国家科技重大专项“重点盆地致密油资源潜力、甜点区预测与关键技术应用”(2016ZX05046-006);中国石油天然气股份有限公司重大科技专项“吐哈探区油气接替领域勘探关键技术研究与应用”(2017E-04-04)

摘　　要：凝灰岩作为一种新型的致密油储层类型,目前已在三塘湖盆地二叠系条湖组油气勘探中获得突破.为了明确该类油藏成藏机理、富集规律、甜点区纵横向分布及效益动用技术,基于致密油地质理论和勘探开发工艺等关键技术,应用钻测井、试油及其分析测试资料,通过烃源岩分布规律、储层微观特征、储层岩石脆性、含油性等方面的研究,对三塘湖盆地凝灰岩致密油勘探开发理论及认识进行总结.研究认为,烃源岩的有效配置、盆地稳定的构造背景和浅水湖盆环境、凝灰岩成分及后期的脱玻化和溶蚀作用、脱玻化时间与石油充注时间的良好配置等控制着致密油藏的平面分布,该油藏具有“自源润湿、混源充注、断缝输导、甜点聚集”的油气成藏特点;攻关致密油水平井体积压裂工艺改造技术及致密油规模开发试验,实现了凝灰岩致密油效益动用.三塘湖盆地条湖组致密油勘探潜力巨大,评价地质资源量达1.43×108t,是油田可持续稳产的重要资源保障.要实现该盆地条湖组致密油的效益开发,需进一步落实“甜点”区,加大技术创新,精心组织和实施,实现致密油开发的降本增效,为油田可持续稳产提供保障.A breakthrough has been made to tuff reservoir,a new type of tight oil reservoir,in the Permian Tiaohu Formation in the Santanghu Basin.In order to clarify the reservoir forming mechanism and enrichment law,the vertical and horizontal distribution of sweet spots and effective reserve producing technology,the distribution law of source rocks,microscopic characteristics of reservoirs,brittleness of reservoir rocks and oil content were investigated,and the theory and understanding of exploration and development of tight tuff reservoir in the Santanghu Basin were summarized using drilling,logging,production test and analytical test data based on tight oil geological theory and exploration and development technology,etc.The results show the oil reservoir enrichment is jointly controlled by effective configuration of source rocks,stable basin structures and shallow water lake basin setting,tuff composition and later devitrification and dissolution,and good time match of devitrification and oil filling.The tuff oil reservoir is characterized by“self-source wetting,mixed-source filling,fault-fracture transport and sweet spot aggregation”.By developing horizontal well volume fracturing technology and scale development experiment,the tight oil in the Santanghu Basin is producing effectively.The exploration potential of the tight oil in the Santanghu Basin is huge,and the geological tight oil resources in the Tiaohu Formation is up to 143 million tons.They are important resource guarantee for sustainable and stable oil production.To get benefit development of the tight oil in the Tiaohu Formation,it is necessary to further identify sweet spots,increase technological innovation,improve organization and management and reduce costs and increase efficiency.These are important factors for sustainable and stable production of Tuha Oilfield.

关 键 词：三塘湖盆地 非常规油气 凝灰岩 地质理论 关键技术 实践经验 

分 类 号：TE122.1[石油与天然气工程—油气勘探]