禹城市城区东营组热储地热资源赋存特征研究

山东省禹城市城区在大地构造上属于华北陆块、华北拗陷区、济阳坳陷区、惠民潜断陷、临邑凹陷南部。通过已有钻探资料及近年的勘查项目研究成果,对禹城市城区东营组热储的地热资源的地质背景、水文地质特征、地热流体化学特征等进行了综合研究分析,认为禹城市城区东营组热储属于层控型低温地热田,地下热水矿化度较大,成因主要为大气降水。     

东营市胜利油田工矿废弃地调查与整治潜力分析

当前,城市的快速扩张导致建设用地供需矛盾日益突出,油田工矿废弃地整治作为土地综合整治规划的重要组成部分,在建设用地指标转移、有效耕地面积增加、生态环境改善等方面可以起到积极的作用。因此,为查清东营市胜利油田工矿废弃地的复垦利用潜力,首先对石油开采对土地利用的影响进行了综述,在此基础上确定了胜利油田工矿废弃地的基本类型,进而对工矿废弃地的现状进行了调查,依据废弃地所在区域的规划用途、灌溉条件、排水条件,盐碱程度、区位条件进行了潜力分区和测算,最终获得了东营市胜利油田工矿废弃地潜力测算的相关数据,可以为该区域工矿废弃地的整治及建设用地、耕地指标的流转与保护提供参考依据。     

Quantitative characterization of connectivity and conductivity of sandstone carriers during secondary petroleum migration,applied to the Third Member of Eocene Shahejie Formation,Dongying Depression,Eastern China

Studies on migration pathways remain qualitative, albeit extensive quantification of migration forcing. In this study, hydrocarbon carriers are defined as carrier units and their corresponding carrier beds for the Third Member of Eocene Shahejie Formation in the Dongying Depression, Bohai Bay Basin, eastern China, on the basis of their lithofacies and physical properties, spatial relationships, and data availability; secondary migration conduits are then quantified. A carrier unit is defined as a stratigraphic unit that contains microscopically porous and permeable carrier beds and is covered by regional seals. The carrier beds are macroscopically and physically connected to each other within a carrier unit and are hydrodynamically connected during secondary migration. A method of quantifying sandstone carrier units using common physical properties is developed. First, a carrier unit containing potential carrier beds is identified on the basis of lithofacies and their lateral changes. Second, physical connectivity of sandstone carrier beds is assessed on the basis of percolation theory. Third, the hydrodynamic connectivity of a sandstone carrier unit is analyzed using effective parameters that may reflect the hydraulic circulation in the carrier unit. Last, the conductivity of a sandstone carrier bed is quantitatively characterized using appropriate physical property parameters. The results for sandstone carrier units in the Third Member of the Shahejie Formation are used in numerical models addressing Pleistocene secondary migration. The model results explain the discovered accumulation and hydrocarbon shows well; and the model predictions on exploration targets have been confirmed by drilling.     

Three-dimensional facies architecture analysis using sequence stratigraphy and seismic sedimentology: Example from the Paleogene Dongying Formation in the BZ3-1 block of the Bozhong Sag,Bohai Bay Basin,China

The Bohai Bay Basin is a classic non-marine rift basin in eastern China. The Paleogene Dongying sequences are the main hydrocarbon-bearing stratigraphic unit in the basin. Using three-dimensional (3-D) seismic data and one well control in the BZ3-1 Block in the western slope of the Bozhong Sag, we analyzed 3-D facies architectures of the Dongying sequences. The Dongying Formation, a second-order sequence, can be subdivided into four third-order sequences (from base to top: SQ1, SQ2, SQ3, and SQ4). The facies architecture was analyzed by using the seismic sedimentology approach based on 3-D seismic data. Sediment of the Dongying sequences was derived from the northern Shijiutuo Uplift via four major configurations of incised valleys, namely “V”, “U”, “W”, and composite shaped incised valleys. Seismic stratal slices reveal branching and converging characteristics of the channels from upstream to downstream. On the basis of an integrated analysis of well log, core data, seismic facies based on multi-seismic attributes, three sedimentary facies (e.g., “delta”, “fan-delta”, and “shore” or “shallow lacustrine” facies) have been recognized. The four types of incised valleys and their evolution control the sedimentary systems in the sedimentation area. The numbers and sizes of the fans are controlled by the sedimentary systems at various scales. Incised valley-fill and deltaic sand bodies are excellent hydrocarbon reservoirs and potentially good exploration targets for the study area. The reservoir quality of sequences SQ1, SQ2, and SQ3 become better gradually from base to top. The proposed sediment dispersal patterns may aid in the prediction of potential reservoir distribution. This study also demonstrates that facies architecture analysis using sequence stratigraphy and seismic sedimentology may serve as an effective approach for constructing 3D facies models for petroleum exploration in areas lacking of well or outcrop data.     

红层“哑地层”划分对比方法——以东营凹陷南坡始新统为例

针对红层划分对比所面临的难题,在充分吸收前人研究成果的基础上,将现有的多种分层方法相互整合,彼此约束和印证,形成了一套科学、便捷的技术方法,即"接触关系明顶底、岩电特征找界面、多元融合定方案、地震约束建格架"的综合地层划分对比技术。该方法针对红层的特殊性,根据岩电特征对干旱气候的响应变化,充分利用了测、录井资料纵向上的连续性优势(避免了取样分析的局限),以及地震资料横向上的优势,有效地解决了红层纵向划分、横向对比的难题,在济阳坳陷东营凹陷南坡始新统沙河街组、孔店组的应用取得了良好效果。该方法可为其它地区同类复杂地层划分对比提供技术支持。     

山东东营凹陷新生代天文地层表简介

综合山东东营凹陷郝科1等6口井的天文地层研究结果提出"东营凹陷新生代天文地层表",表中列出的是"国际地层表(2004)"、"中国区域年代地层表(2000)"和0—65Ma期间天文偏心率405ka周期编号以及东营凹陷孔店组(顶部)至平原组各组的年龄以及东营凹陷新生代51Ma以来3个大的地层不整合:1)沙河街组二段下部,大约33.8—33.4Ma期间405ka周期振幅不明显、100ka周期较强,与南大西洋33.4—33.7Ma和热带太平洋33.6—33.7Ma期间沉积物中显著转折等特征可作对比;2)东营组-馆陶组界线上下,东营组三角洲顶面最后萎缩时间约为24.467Ma,推测由此至渐新世末(23.03Ma),大约近1.5Myr期间本区没有大的湖泊,而是冲积—河流相沉积,中新世初(23.03Ma)快速隆起,直到约18—16Ma开始馆下段的上部沉积,这一区域性角度不整合面形成大约持续5—7Myr;3)上新统-更新统界线上下,根据本区东辛2-4井古地磁和天文地层研究,测出布容、松山、高斯和吉尔伯特等4个极性时,求出2.546Ma—1.806Ma期间[明上(上)亚段顶]可能沉积并剥蚀过的地层厚度为129m;1.806—0.908Ma期间,因构造活动本区上升成为高山,第四系平一段底部形成了大的不整合面。     

山东东营凹陷渐新统东营组的天文地层研究

选定东营凹陷牛38、郝科1和利1等3口井东营组进行天文地层研究。以牛38井沙河街组一段顶界31.8Ma作为东营组底界年龄,得到3口井各段的年龄平均值为:东二段底28.406Ma,东一段底25.385Ma和顶界24.467Ma。东营组底界(31.829Ma)大致相当于"中国区域地层表"提出的32Ma的渐新统底年龄,但是与"国际地层表"提出的渐新世鲁培尔阶底界(33.9Ma)相差1.9Myr。东三段底界、顶界的平均年龄分别为31.829Ma、28.406Ma大致可与中国的乌兰布拉格阶或国际的鲁培尔阶中上部相当;东二段底界至东一段顶界的平均年龄大致相当于塔本布鲁克阶或夏特阶。根据东营组岩石地层与天文地层研究认为,在三角洲沉积过程中,东营组各段界线是穿时的,如东三与东二段界线的年龄相差可达1.4Myr。根据偏心率理论曲线和小波分析,夏特阶底界(28.4Ma)附近的变化可能与偏心率100ka左右理论周期的特殊变化有关。     

东营凹陷古近系成岩层序特征与储集差异性分析

根据对东营凹陷油气储层成岩规律的分析,结合层序地层单元的分布构架,发现成岩演化过程所决定的成岩相特征与层序地层分布有密切相关性。阐述了在层序界面附近和层序体内部成岩作用发生的一般规律,认识到油气储层的储集性受成岩相和成岩层序控制。认为东营凹陷古近系近期勘探所取得的一系列成果,与成岩作用的差异性有关。将储层储集特征和成岩层序特征有机结合,合理地解释了凹陷内油气富集规律。说明该区油气勘探工作必须有的放矢,科学布局,循序追踪,才能获得最佳勘探效果。     

Distribution Patterns of Calcite Cement in the Turbidite Sandstones of the Shahejie Formation in the Dongying Depression, Eastern China

Calcite cements are volumetrically dominant among the most diagenetic constituents in turbidite sandstones of the Paleogene Shahejie Formation in the Dongying Depression. The results show carbonate cements mainly occur in three phases: Calcite I (pre-compaction), Calcite II (post-compaction) and ankerite in the turbidite sandstone. The isotopic composition of Calcite I and Calcite II range from ?4.3‰ to 4.4‰, ?3.5‰ to 4.3‰ PDB, respectively, suggesting that the calcite cements are mainly derived from the interbedded shales. The early calcite cement precipitated from the mixing of lacustrine and meteoric waters at 38–69°C. The late-phase calcite precipitated from pore waters modified by water-rock interactions at 64–126°C. Two distribution patterns of calcite cements can be identified, depending on their position within the sandstone. The peripheral cementation of the sandstones is near the sand-shale contact. The development of cement is controlled by sandstone thickness and the properties of the interbedded shale. For scattered cementation, the distribution of the calcite cement is not controlled by the sand-shale contact. Calcite cement was preferentially distributed in coarse-grained sandstones, indicating that sandstones with high original permeability are the preferred pathway for the migration of early diagenetic fluids.     

渤中西环古近系东营组物源转换与沉积充填响应

通过砂岩中碎屑锆石U-Pb年龄分析、火山碎屑组分含量变化、地震多属性分析、层序地层格架与沉积充填特征综合分析,认为东二段沉积时期渤中西环的物源供给方式、层序地层格架及沉积充填特征发生明显的变化.东二下段沉积期前,湖盆处于强烈裂陷期,中-深湖相泥岩发育,物源主要为盆地内部的中生代火成岩基底,沉积层序明显受盆内低凸起控制,在盆内低凸起四周发育一系列近源的扇三角洲朵体;东二下段沉积期后,湖盆处于断-坳过渡期,盆内低凸起四周的断裂活动减弱,沉积层序逐渐向盆内低凸起超覆,盆外太古代-元古代变质岩物源供给不断加强,近源的扇三角洲砂体逐渐向远源的辫状河三角洲砂体转化,同时发育宽广的滨浅湖环境.渤中西环古近纪沉积充填过程中,地层样式、沉积模式与物源供给方式的一致性变化,体现了裂陷湖盆充填演化的内在规律,为我国东部裂陷盆地演化及裂陷旋回划分提供了新的线索.