鄂尔多斯盆地安塞地区,延长组7段(长7段)发育优质的页岩与泥岩烃源岩.开展泥岩与页岩的区别研究,有助于评价页岩与泥岩的品质,识别它们对油气资源的贡献.基于25口重点探井开展了岩心描述工作,同时选取泥岩及页岩样品共计81块开展地球化学测试与分析,以获得泥岩与页岩的地化特征并开展差异性对比.结果表明,长7段泥岩与页岩均处于热成熟生油的热演化范围、有机质丰度均达到好烃源岩标准、页岩有机质类型以Ⅰ型与Ⅱ1型为主,而泥岩有机质类型以Ⅱ1与Ⅱ2型为主.在页岩与泥岩的地化特征对比上发现,页岩有机质丰度显著高于泥岩,其中最主要的影响因素是有机碳含量大于4％的页岩样品数量较多;页岩有机质类型更偏于生油,其中最主要的影响因素是高氢指数的腐泥质组分相对丰富;页岩的游离烃、热解烃以及生烃潜量均优于泥岩,但页岩中孔隙及微裂缝对游离烃的统计影响更大;由于页岩孔隙及微裂缝更容易发育,泥岩对烃类的滞留能力可能更强,而页岩中烃类的排运相对容易;泥岩与页岩的生标参数并无显著差异.

弄清黄陵地区延长组长6储层特征,进一步加快对黄陵油田的开发和认识,为后期油田开发提供依据和保障.通过对该区域范围内所有钻穿长6井探井和开发井的测井资料、录井资料、岩心资料、试油试采等资料进行分析,通过研究该区域的长6层的沉积特征、砂体展布特征、储层岩石学特征、储集特征以及成岩作用对储集岩物性等方面,研究表明黄陵地区长6油层组主要湖泊相沉积,并发育深湖亚相沉积,储集层岩石类型主要为岩屑长石砂岩,具高石英、低长石、低岩屑的特征,填隙物主要以胶结物为主,储层孔隙度平均值7.28％,渗透率平均值0.440 1×10-3μm2,压实作用是孔渗降低、储层物性变差的主要原因之一.进一步说明黄陵地区延长组长6油层岩矿成份复杂,储层物性差,非均值性强,裂缝发育.

安塞油田Y25区长6层因物性差,油井单井产能低,开采效果差.从2005年开始,在Y25井区开展0.3mD技术攻关试验,通过储层精细研究,优化开发方式等一系列政策,目前两口井日产达到1.5t,在地质上实现重大突破.本文重点对Y25井区长6层低产因素进行系统总结,提出该类油藏的开发对策,从而为同类低丰度油藏的开发提供一个可借鉴的成功开发模式.

水灾是煤矿五大灾害之一,在煤矿生产时期,常常会遇到水的危害,文章分析了那怀煤矿水文地质条件及矿井涌水来源,同时根据本矿实际情况采取切实可行的综合防治措施,确保了矿井安全生产,使矿井取得了良好的治理效果和经济效益。

Chang 81 reservoir, which is of large thickness, good reservoir physical property and high oil saturation in Block Zhuang 58 of Xifeng Oilfield, is characterized by high water saturation in early production period. It is necessary to analyze the cause of water producing in order to develop the reservoir economically and effectively. Based on the study of basic geological characteristics of Chang 81 reservoir in the block, the movable fluid evaluation and research were made with six cores using nuclear magnetic resonance technique. The causes of water producing were analyzed for Chang 81 low permeability reservoir by using SEM and casting thin sections methods. The study results show that the thicker chlorite films is, the smaller the saturation of movable fluid will be. The heavy component absorbed by lipophilic chlorite films is the main reason that the water is produced after implementing perforation without oil in the reservoir although the reservoir is interpreted as oil layer or oil-water layer by logging interpretation.

通过对鄂尔多斯盆地西南部镇原地区延长组长8砂岩的岩石学特征、轻重矿物组合特征、古水流方向、碎屑粒度变化及稀土元素分配模式等的研究,探讨了源区母岩性质。结果表明,研究区长8沉积期的主要物源来自西南方向,源区母岩主要为西南缘陇西古陆及南部秦岭古陆的前震旦系及下古生界的变质岩系。

Aim To research the fracture characteristics of Chang 6 reservoir in Pingqiao area of Ansai Oilfield in Ordos Basin.Methods According to the cores,study in slices and polished sections,analysis of the stress strain curve of fracturing samples,combined with history of the regional tectonic stress,the fractures characteristics of Chang 6 reservoir in Pingqiao area of Ansai Oilfield are researched.Results The research indicated that fractures of Chang 6 reservoir in Pingqiao area are poor-developed.Most fractures extended along the direction of NE.There are also some EW-directional and NW-directional fractures.SN-directional fractures are few in quantity.Conclusion Most of these fractures are closed underground in form of potential fracture,which should be paid more attention during the period of oil field development.

安塞油田塞431区块是坪桥区块长2油藏开发的重要组成部分,伴随着注水开发,油藏近年来一直表现为含水上升,油量下降的开发趋势,2008年初综合含水率达到92.1%,进入了特高含水开发阶段。通过对塞431区块在不同开发条件下表现出的不同开发特征进行研究,发现保持合理注采比,并进行合理的油水井措施,是提高塞431的油井利用率的关键,也是提高最终采收率的具体手段。