松南盆地情字外前缘砂页交互储层可压性评价  

Fracturability evaluation on sand-shale interbedded reservoir at forefront of Qingzi margin in Songnan basin

作　　者：陈凯 段永伟[1] 于雪盟 刘洪霞 王翠翠 朱旭 CHEN Kai;DUAN Yongwei;YU Xuemeng;LIU Hongxia;WANG Cuicui;ZHU Xu(Oil and Gas Technology Research Institute of Jilin Oilfield Company,Songyuan,Jilin 138000,China)

机构地区：[1]中国石油吉林油田公司油气工艺研究院,吉林松原138000

出　　处：《油气井测试》2024年第4期66-72,共7页Well Testing

基　　金：中国石油天然气股份有限公司重大科技专项“吉林水平井体积改造技术提升攻关与现场试验”(2022ZS0604)。

摘　　要：松南盆地情字外前缘砂页交互储层资源储量丰富,但储层孔渗较低,资源禀赋差,在采取改造措施前需要对其进行有效的可压性评价。通过对该区的岩心进行X射线衍射、三轴应力压缩等实验,以脆性系数、水平地应力差异系数、断裂韧性以及脆性矿物含量四种影响因素为基础,采用层次分析法确定各因素所占权重,构建了与储层具有较好匹配程度的可压性指数计算模型,综合波速各向异性分析、应力敏感性评价等实验结果,对储层的可压性进行综合评价。结果显示,情字外前缘砂页交互储层可压性指数计算结果为0.28,可压性中等,但水平层理及天然裂缝较为发育,目标层整体具有较大的改造潜力。应用该方法对H2-1井开展可压性评价,并根据评价结果对压裂方案进行优化,优化后微地震解释有效改造体积491.2×10^(4)m^(3)、平均日产油9 m^(3),应用效果显著,研究成果可为压裂施工技术路线的确定提供理论支撑。The sand-shale interbedded reservoir at the forefront of the Qingzi margin in the Songnan Basin is rich in hydrocarbon resources but characterized by low porosity and permeability,indicating poor resource quality.An effective evaluation of its fracturability is necessary before implementing any stimulation measures.Through core analysis,including X-ray diffraction and triaxial stress compression experiments,four key factors—brittleness coefficient,horizontal stress differential coefficient,fracture toughness,and brittle mineral content—were investigated.By using analytic hierarchy process,the weights to these factors were determined,and a fracturability index model that aligns well with the reservoir characteristics was established.Integrating results from wave velocity anisotropy analysis and stress sensitivity evaluation,a comprehensive fracturability evaluation on the reservoir was performed.The results indicate that the fracturability index of the sand-shale interbedded reservoir at the Qingzi margin is 0.28,signifying moderate fracturability.Despite this,the well-developed horizontal bedding and natural fractures suggest significant stimulation potential for the target layer.The methodology was applied to well H2-1 for fracturability evaluation,and the results were used to optimize the fracturing plan.After optimization,the micro-seismic interpretation of the well showed an effective stimulation volume of 491.2×104 m 3 and an average daily oil production of 9 m 3,demonstrating remarkable application effectiveness.The research outcomes provide a theoretical support in determining the technology route for fracturing operation.

关 键 词：松南盆地 砂页交互储层 矿物特征 力学特征 波速各向异性 应力敏感性 可压性评价 压裂优化 

分 类 号：TE357[石油与天然气工程—油气田开发工程]