吐哈盆地侏罗系三工河组高含水致密砂岩油气储层甜点预测  

Prediction of sweet spots in the high-water-content tight sandstone reservoirs of Jurassic Sangonghe Formation in the Tuha Basin

作　　者：郝巍[1] 孙鑫鑫 连建文 韩跃涛 张峻霖 李臻[1] 程朝辉 苑益军[3] 孙鲁平[3] HAO Wei;SUN Xinxin;LIAN Jianwen;HAN Yuetao;ZHANG Junlin;LI Zhen;CHENG Zhaohui;YUAN Yijun;SUN Luping(Exploration and Development Research Institute,PetroChina Tuha Oilfield Company,Hami,Xinjiang 839099,China;Shanshan Oil Production Plant,PetroChina Tuha Oilfield Company,Shanshan,Xinjiang 838202,China;China University of Geosciences-Beijing,Beijing 100083,China)

机构地区：[1]中国石油吐哈油田公司勘探开发研究院,新疆维吾尔自治区哈密市839009 [2]中国石油吐哈油田公司鄯善采油管理区 [3]中国地质大学(北京)地球物理与信息技术学院,北京市100083

出　　处：《天然气工业》2025年第2期63-72,共10页Natural Gas Industry

基　　金：国家自然科学基金项目“基于深度卷积神经网络的薄互层地震智能预测研究”(编号:42204128)、“基于复矢量Radon变换的地震矢量波场分离方法研究”(编号:41974157)。

摘　　要：致密砂岩通常单砂体分布有限,砂体之间连通性差,砂体物性非均质性强,甚至部分区域砂体储层微裂缝发育,油气藏高含水,导致一般非常规油气藏勘探开发技术难以适用于高含水、微裂缝发育的致密砂岩油气藏。为了解决砂体横向变化快,储层非均质性强,地震甜点预测难以及微裂缝较发育和水平井体积压裂可能带来的高含水致密砂岩油气藏高效开发问题,以吐哈盆地丘东洼陷吉7区块侏罗系三工河组高含水致密砂岩油气藏为例,利用区内钻完井、试采和最新地震资料,在分析致密砂岩油气藏富集主控因素的基础上,采用地质—地震一体化的思路深入开展了裂缝和储层甜点的精细预测。研究结果表明:①系统分析凹陷内致密油气藏富集主控因素,厘清了储层甜点的影响因素,结合试采及钻完井资料,明确了甜点和裂缝对致密油气富集的主控作用;②在已有勘探认识基础上,利用最新采集的三维地震资料,采用基于多属性融合的裂缝预测方法,综合相干、曲率和最大似然属性预测了裂缝发育有利区,裂缝主要发育于走滑断裂和凸起区,呈雁列展布;③基于储层评价、裂缝预测,以及地震属性分析,综合识别并刻画了致密油气甜点区,明确了有利区分布范围,指出吉10H井南是下一步开发有利区。结论认为,基于地质—地震一体化的高含水致密油气富集及甜点预测方法是实现致密油气开发的重要技术手段,可为其他地区高含水、微裂缝发育的致密油气藏高效规模开发提供有益指导和借鉴。Tight sandstone typically has a limited distribution of sandbodies,which are poorly connected and highly heterogeneous in physical properties.Even in some areas,the sandstone reservoirs contain microfractures and high water content.Such tight sandstone reservoirs with high water content and microfractures cannot be exploited by common exploration and development technologies for unconventional reservoirs.These high-water-content tight sandstone reservoirs are challenged by lateral sandbody variation,strong heterogeneity,difficult sweet spot prediction by seismic data,and other issues impeding the efficient development possibly induced by the presence of microfractures and horizontal well volume fracturing treatment.Taking the high-water-content tight sandstone reservoirs of Jurassic Sangonghe Formation in the Ji-7 block,Qiudong sag,Tuha Basin,as an example,fractures and sweet spots are finely predicted by carrying out the geology–seismic integration idea,using the drilling/completion,production test and latest seismic data,and through the analysis of factors controlling the hydrocarbon enrichment in tight sandstone.The following results are obtained.First,the influencing factors of sweet spots are clarified by a systematic analysis on the factors controlling the hydrocarbon enrichment in tight sandstone in the study area.Combining with production test and drilling/completion data,the controls of sweet spots and fractures on the enrichment of tight oil/gas are determined.Second,based on the existing knowledge from exploration operations,the favorable fracture zones are predicted using newly acquired 3D seismic data,by a method based on multi-attribute fusion,and with consideration to coherence,curvature and maximum likelihood attributes.It is found that fractures are developed in strike-slip fault and bulge zones,and distribute in en echelon pattern.Third,based on reservoir evaluation,fracture prediction,and seismic attribute analysis,the tight oil/gas sweet spot zones are identified and characterized,and the di

关 键 词：吐哈盆地 丘东洼陷 侏罗系三工河组 高含水致密砂岩油气藏 甜点规模 地质—地震一体化 储层预测 负向构造 

分 类 号：TE122.23[石油与天然气工程—油气勘探]