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致密砂岩储层层理缝与构造缝渗吸差异分析 ——以吉木萨尔凹陷芦草沟组为例
梁成钢,罗群,张金风,陈佳宇,徐田录,崔倩,滕志辉
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(1.中国石油新疆油田分公司吉庆油田作业区,新疆克拉玛依834000;2.中国石油大学(北京)非常规油气科学技术研究院,北京102249;3.中国石油新疆油田分公司准东采油厂,新疆昌吉831511)
摘要:
针对致密砂岩储层层理发育特点,探究层理缝渗吸效果,对进一步研究致密砂岩储层压裂开发具有重要意义。选取吉木萨尔凹陷芦草沟组致密砂岩储层为研究对象,开展静态渗吸物理模拟实验以及动态高温高压模拟实验,对层理缝与构造缝渗吸效果进行比较,探索两者渗吸效率差异及其根本原因,确定层理缝渗吸主控因素。研究结果表明:常温下构造缝平均渗吸效率约为26%,层理缝渗吸效率为20%,层理缝渗吸效率约为构造缝的77%;层理缝渗吸效果较好,常温常压和地层温压条件下渗吸可以分为极速渗吸、快速渗吸和缓慢—停止渗吸共3个阶段;地层温度升高,层理缝与构造缝渗吸效果差异减小,层理缝渗吸效率可达到构造缝的93.4%;在开启构造缝同时开启相同面积层理缝,渗吸效果基本不变,但渗吸时间大大缩短。层理缝与构造缝由于纵横向孔隙结构的不同,导致渗吸效率存在差异。
关键词:  致密砂岩储层  渗吸  层理缝  构造缝  吉木萨尔凹陷
DOI:10.13673/j.cnki.cn37-1359/te.2020.04.012
基金项目:国家自然科学基金项目“致密油储层层理缝启闭与石油充注”(41672118),中国石油天然气股份有限公司重大科技专项“陆相中高成熟度页岩油勘探开发关键技术研究与应用”(2019E-2609),中国石油战略合作科技专项课题6“吉木萨尔页岩油甜点形成机制与分类预测技术研究”(ZLZX2020-01-6)。
Analysis of imbibition difference between bedding fractures and structural fractures in tight sandstore reservoir:A case study in Lucaogou Formation in Jimsar Depression
LIANG Chenggang,LUO Qun,ZHANG Jinfeng,CHEN Jiayu,XU Tianlu,CUI Qian,TENG Zhihui
(1.Jiqing Oilfield Operation Area of Xinjiang Oilfield Company,CNPC,Karamy,Xinjiang,834000,China;2.Unconventional Oil and Gas Science and Technology Research Institute,China University of Petroleum(Beijing),Beijing City,102249,China;3.Zhundong Oil Production Plant,.Xinjiang Oilfield Company,CNPC,Changji,Xinjiang,831511,China)
Abstract:
Considering the wide distribution of bedding fractures in tight sandstone reservoir,it is of great significance to further study the hydraulic fracturing of tight sandstone reservoir by investigating the effect of imbibition displacement of bedding fractures. The tight sandstone reservoir of Lucaogou formation in Jimsar Depression is selected as the research object,and the static imbibition experiments and dynamic simulation experiments at high temperature and high pressure are carried out to compare the imbibition displacement performance between the bedding fractures and structural fractures,and explore the reason caused the difference of imbibition performance. The main controlling factors for imbibition displacement of bedding fractures are determined. Results show that average imbibition efficiency of structural fractures and bed? ding fractures are about 26% and 20% at room temperature. That is to say the imbibition efficiency of the bedding fractures is 77% of that of the structural fractures. The imbibition performance of bedding fractures on improving oil recovery is better. Under normal temperature and pressure or formation temperature and pressure,the imbibition process can be divided into an extremely fast reaction stage,a fast reaction stage,and a slow-stop stage. As the formation temperature rises,the difference of imbibition efficiency between bedding fractures and structural fractures decreases slightly,and the imbibition efficiency of the bedding fractures is 93.4% of that of the structural fractures. When the structural fractures and bedding fractures with the same area are opened together,the imbibition efficiency is basically unchanged,but the imbibition time is greatly reduced.Due to the difference of pore structure in vertical and horizontal direction between bedding fractures and structural fractures,the imbibition efficiency of them is different.
Key words:  tight sandstone reservoir  imbibition  bedding fracture  structural fracture  Jimsar Depression

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