济阳坳陷古近系页岩油富集规律认识与勘探实践  

Enrichment rules and exploration practices of Paleogene shale oil in Jiyang Depression, Bohai Bay Basin, China

作　　者：宋明水[1] 刘惠民[1] 王勇[2] 刘雅利[2] SONG Mingshui;LIU Huimin;WANG Yong;LIU Yali(Sinopec Shengli Oilfield Company,Dongying 257000,China;Exploration and Development Institute of Shengli Oilfield Company,Sinopec,Dongying 257015,China)

机构地区：[1]中国石化胜利油田分公司,山东东营257000 [2]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《石油勘探与开发》2020年第2期225-235,共11页Petroleum Exploration and Development

基　　金：国家重点基础研究发展规划(973)项目(2014CB239100);国家专项(2017ZX05049)。

摘　　要：基于40余口页岩油工业油流井的测试数据和4口取心井累计1 010.26 m系统岩心观察以及上万块次样品测试数据,通过多井次页岩油井钻探和老井压裂先导试验,分析济阳坳陷古近系沙河街组四段上亚段—沙河街组三段下亚段页岩基本特征,明确页岩油富集要素,建立页岩油富集模式,形成页岩油甜点综合评价方法。认为目的层段页岩具有非均质性强、成岩弱、热演化程度低、黏土和碳酸盐矿物含量高等特征;页岩岩相、微裂缝、薄夹层和异常压力是页岩油富集稳产的主控因素,富有机质纹层状岩相储集性、含油性最优,微裂缝网络体系改善了页岩储集性和渗流能力,薄夹层为页岩油稳定产出主要渗流通道,异常高压发育段游离态页岩油富集、含油性好;将目的层段页岩油划分为基质型、夹层型和裂缝型3类,依据页岩油赋存特征,结合国内外页岩油勘探实际,认为夹层型页岩油是目前最具有勘探效益的类型;界定不同类型页岩油选区参数标准,多因素综合评价页岩油有利区。夹层型页岩油井F159、F143、GX26等直井采用'体积压裂'+'高导流通道压裂'组合缝网套管压裂工艺,改造后日产油6t以上,最高可达日产44 t,产能稳定,页岩油有望成为济阳坳陷油气勘探的重要接替阵地。Based on formation testing data of more than 40 wells with industrial oil flow, systematic observation of 1 010.26 m long cores taken from 4 wells and test data of over 10 000 core samples combining with drilling and pilot fracturing data of multiple wells, the geological characteristics of the upper submember of the Sha 4 Member to the lower submember of the Sha 3 Member of Paleogene(Es4 s-Es3 x) in Jiyang Depression were investigated to find out factors controlling the enrichment of shale oil and the accumulation model of shale oil, and a comprehensive evaluation method for shale oil sweet spots was established. It is found through the study that the target shale layer is characterized by strong heterogeneity, weak diagenesis, low thermal evolution and high content of clay and carbonate minerals. Shale lithofacies, microcrack, thin interlayer and abnormal pressure are the main factors affecting enrichment and stable production of shale oil, the organic rich laminar shale has the best storage and oil-bearing capacity, microcrack network system improve the storage capacity and permeability of the shale, the thin interlayer is the main flow channel for stable shale oil production, and the abnormal high pressure layer is rich in free state shale oil and high in oil content. The shale oil layers in the target section were divided into three types: matrix, interlayer and fracture ones. According to the occurrence state and exploration practice of shale oil at home and abroad, it is concluded that the interlayer shale oil is the most profitable type at present. The selection parameters for the different types of shale oil were determined, and accordingly the favorable areas were pointed out by comprehensive evaluation of multiple factors. Vertical wells in the interlayer shale oil reservoir, such as Fan 159, Fan 143 and GX 26, were stimulated by volume fracturing and high conductivity channel fracturing jointly. After fracturing, they had a daily oil production of over 6 t, up to 44 t, and stable productivity. Shale o

关 键 词：页岩油 富集要素 富集模式 页岩油甜点 岩相 微裂缝 薄夹层 异常压力 济阳坳陷 

分 类 号：TE122[石油与天然气工程—油气勘探]