Creation Conditions and Development Model for Lithologic and Stratigraphic Traps in the West Sag of the Beach Area,Liaohe Depression

At present the Eocene reservoir is the focus of exploration in the west sag of the beach area,Liaohe Depression,and lithologic and stratigraphic traps are the most important in the future work.The regional geological background indicated that lithologic and stratigraphic traps might be created in the study area. Studies on creation conditions and distribution pattern of lithologic and stratigraphic traps are

Sedimentary Patterns and Stratigraphic Trap Models of Deeply Buried Intervals in the Baxian Depression, North China

The Baxian depression is a typical half-graben located in the Jizhong sub-basin, north China. Commercial petroleum traps have been discovered in the Jizhong sub-basin. However, the 3rd and 4th members of the Shahejie Formation in this sub-basin have been poorly explored. These two members, belonging to the Lower Paleogene age, are buried deeply in the depression. Favorable petroleum reservoir conditions exist in such deep intervals of the half-graben due to the presence of different types and extent of deltas and turbidity fans in various areas. In fact, three types of turbidite fans are developed in the sag below the transitional belt on the eastern gentle slope. This work summarized three stratigraphic trap belts, i.e., the steep slope, gentle slope, and sag. On the steep slope, structural- stratigraphic traps with small-scale delta fronts and turbidite sandbodies are well developed. On the gentle slope, hydrocarbons generally accumulate in the large-scale delta front, onlapping beds and those sandbodies adjacent to unconformities. In the sag, petroleum trap models are typically characterized by pinched-out turbidite sandbodies. Stratigraphic traps were easily formed in turbidite fans below the eastern transitional belt. The petroleum traps that have already been discovered or predicted in the study area indicate that stratigraphic traps have favorable petroleum exploration potential in deeply buried areas （depth 〉5000 m） in a half-graben basin or depression.

Seismic geomorphology and stratigraphic trap analyses of the Lower Cretaceous siliciclastic reservoir in the Kopeh Dagh-Amu Darya Basin

Lower Cretaceous Shurijeh–Shatlyk Formations host some of the main reservoirs in the Kopeh Dagh-Amu Darya Basin.Exploration in this area so far has focused on the development of structural traps, but recognition of stratigraphic traps in this area is of increasing importance. Integration of 3D seismic data with borehole data from thirteen wells and five outcrop sections was used to identify potential reservoir intervals and survey the hydrocarbon trap types in the East Kopeh Dagh Foldbelt(NE Iran). Analyses of horizontal slices indicated that the lower Shurijeh was deposited in a braided fluvial system.Generally, three types of channel were identified in the lower Shurijeh Formation: type 1, which is low-sinuosity channels interpreted to be filled with non-reservoir fine-grained facies;type 2, which is a moderately sinuous sand-filled channel with good prospectively;and type 3, which is narrow, high sinuosity channel filled with fine-grained sediments. Results indicate that upper Shurijeh–Shatlyk Formations were deposited in fluvial to delta and shallow marine environments. The identified delta forms the second reservoir zone in the Khangiran Field. Study of the stratigraphic aspects of the Shurijeh succession indicates that both lower and upper Shurijeh reservoirs are stratigraphic reservoir traps that improved during folding.

Study of a Stratigraphic Trap of Paleocene/Late Cretaceous Age with the Help of Seismic Data in Sulaiman Foredeep and Kirthar Foredeep Area (Central &Southern Indus Basin, Pakistan)

The Research work comprises area of Punjab Platform, Sulaiman Foredeep and Eastern Part of Sulaiman Fold Belt (from east to west), which is further extended to Zamzama and Dadu area of Lower Indus Basin. Seismic data interpretation suggests a presence of a stratigraphic trap of Paleocene/Late Cretaceous age. It can act as a stratigraphic trap of reservoir quality for hydrocarbons. This feature is marked and discussed on various seismic sections. Sometimes it is difficult to locate this feature due to effect of folding, resulting from later compressions associated with a collision of Indian Plate. This structure could be explored for a hydrocarbon prospect in future. Such stratigraphic traps were not explored in the past.

3-D seismic interpretation of stratigraphic and structural features in the Upper Jurassic to Lower Cretaceous sequence of the Gullfaks Field,Norwegian North Sea:A case study of reservoir development

The 3-D seismic dataset is a key tool to analyze and understand the mechanism of structural and stratigraphic hydrocarbon(HC)trapping in the subsurface.Conventionally used subsurface seismic characterization methods for fractures are based on the theory of effective anisotropy medium.The aim of this work is to improve the structural images with dense sampling of 3-D survey to evaluate structural and stratigraphic models for reservoir development to predict reservoir quality.The present study of the Gullfaks Field,located in the Norwegian North Sea Gullfaks sector,identifies the shallowest structural elements.The steepness of westward structural dip decreases eastward during the Upper Jurassic to Lower Cretaceous deposition.Reservoir sands consist of the Middle Jurassic deltaic deposits and Lower Jurassic fluvial channel and delta plain deposits.Sediment supply steadily prevails on sea-level rise and the succession displays a regressive trend indicated by a good continuous stacking pattern.The key factor for the development of reservoirs in the Gullfaks Field is fault transmissibility with spatially distributed pressure.The majority of mapped faults with sand-to-sand contacts are non-sealing,which provide restriction for the HC flow between the fault blocks.The traps for HC accumulation occur between the post-rift and syn-rift strata,i.e.antiform set by extensional system,unconformity trap at the top of syndeposition,and structural trap due to normal faults.Overall reservoir quality in the studied area is generally excellent with average 35%porosity and permeability in the Darcy range.Our findings are useful to better understand the development of siliciclastic reservoirs in similar geological settings worldwide.

苏北盆地黄桥地区盐城组氦气成藏地质条件及富集规律

苏北盆地黄桥地区新近系盐城组天然气中He含量介于1.05%~1.40%,普遍高于工业品位,为壳—幔复合型氦气资源。目前,对于这种来源的氦气富集主控因素以及勘探目标评价的研究较为薄弱,为此,系统剖析了黄桥地区典型富氦气藏氦气成因、来源及圈闭特征,重点分析了幔源断裂对富氦气藏输导作用、盐城组圈闭条件的影响,提出了黄桥地区盐城组富氦气藏富集模式。结果表明:(1)黄桥地区南新街深大断裂在盐城组沉积时期持续活动,导致幔源物质上涌,伴随着火山活动及CO_(2)、N_(2)以及氦气沿断裂运移至浅层;(2)黄桥地区盐城组埋深为370~400 m,盐城组底部砂岩厚度约为40 m,上覆10~40 m泥岩,储盖组合有利,富氦气层由东往西尖灭;(3)黄桥地区盐城组整体为单斜构造,盐城组底部界面与下伏地层呈角度不整合,通过地震标定及解释,刻画出了富氦气层岩性—地层复合圈闭面积。黄桥地区盐城组富氦气藏具有断裂沟通地幔输导、砂岩储集、泥岩作为盖层、岩性—地层复合圈闭富集等特征,该认识对黄桥地区氦气有利目标评价具有重要意义。

南美奥连特盆地坎潘阶碳酸盐岩建隆的识别及科迪勒拉运动早期抬升对Main-M1储集层沉积的控制作用

厄瓜多尔奥连特盆地Main-M1砂岩储集层是该盆地近年来重要的构造-岩性圈闭勘探目的层系,寻找砂体和岩性尖灭带是Main-M1砂岩勘探的关键。该盆地为晚白垩世弧后热沉降盆地和新生代前陆盆地的叠合盆地,在构造上分为西部逆冲褶皱带、中部前渊带和东部斜坡带,在前渊带发育一系列近N-S走向长轴背斜。综合观察和分析发现,在研究区内长轴背斜上生长了1个碳酸盐岩建隆,地震上具有明显的边界反射形成丘状外观和较连续的弱振幅内部反射,测井上具有厚层、近箱型低GR响应特征。该建隆表明在其沉积的坎潘阶时期,长轴背斜已经开始抬升,将背斜顶部推升至古水面附近,形成建隆局部生长的条件。压实回剥方法恢复古地貌证实,长轴背斜在坎潘阶早期开始发育,构造抬升幅度为7~10 m。由于构造抬升和建隆发育始于Main-M1沉积前,抬升古地貌可影响砂岩沉积。根据背斜上数十口已钻井Main-M1砂体厚度统计,发现背斜顶部砂岩储集层整体较发育,但古建隆顶部砂层厚度减薄或者缺失,在背斜的南部延伸段,构造顶部砂岩缺失,仅在东部侧翼富集。提出了近N-S向背斜古地貌影响Main-M1砂体沉积,使砂岩于富集于构造下倾方向的控砂模式。该模式可形成上倾尖灭型构造-岩性圈闭,从而提供了通过古地貌恢复在奥连特盆地前渊带寻找新圈闭的勘探思路。

塔北隆起哈拉哈塘-哈得地区中生界次生油气藏形成条件分析

塔里木盆地塔北隆起带哈拉哈塘-哈得地区中生界面积超3万km^(2),处于大型单斜背景,油气显示活跃,具有较大的勘探潜力,但多年来未有勘探突破。邻区中石化矿区的发现使得该区的勘探再次提上了日程。基于新处理的三维地震资料,在分析区域地质概况的基础上,系统分析了油源条件、走滑断裂的构造及演化特征和岩性圈闭的形成及封堵条件,明确了该区的成藏模式及有利勘探方向。研究区中生界发育河流-三角洲沉积体系,其中三叠系发育NE-SW向条带状三角洲砂体,侏罗系和白垩系下部发育SE-NW向展布的叠覆浅水三角洲砂体,白垩系上部发育大面积连片状的辫状河砂体。该区经历了3期隆升,发育5期断层,其中中生界的三叠系-侏罗系断层是古生界断层的伴生断层,受古生界断层的发育控制,雁列状NE-SW向展布。白垩系和侏罗系浅水三角洲前缘单一朵体或多个朵体披覆泥岩拼接形成了侧向遮挡,与上倾方向断层联合形成岩性-断层圈闭,三叠系条带状SE方向展布的三角洲砂体和大型河道弯曲部位河道外泥岩遮挡形成岩性圈闭。油气源于古生界古油藏,通过古生界奥陶系断层泄漏后,经中生界伴生断层直接进入中生界圈闭或经中生界断层接替输运进入圈闭而成藏。基于此,认为本区勘探潜力区主要有北部走滑带的侏罗系-白垩系舒善河组三角洲前缘岩性油气藏、三叠系北侧的三角洲前缘砂体和南部河道砂体岩性油气藏和三叠系北部隆起区披覆小型扇体岩性油气藏。断裂组合、砂体展布及披覆泥岩遮挡3个关键控藏要素及其有效配置是塔北隆起带大型斜坡区形成有利岩性、岩性-断层复合圈闭油气藏的重要前提,该认识为该区油气的深化勘探指明了方向,对其他地区岩性、岩性-断层复合圈闭油气藏勘探具有借鉴意义。

前陆盆地斜坡区坡折带对沉积体系的控制作用——以四川盆地川中地区须家河组四段为例

为了明确前陆盆地斜坡区坡折带对沉积体系的控制作用,厘定沉积体系展布规律,以四川盆地川中地区须家河组四段为例,采用地层厚度法恢复了古地貌,刻画了坡折带,并通过岩芯观察、测井相及地震相分析,识别了前陆斜坡区沉积微相类型,在此基础上,通过沉积微相与古地貌叠合分析,提出前陆盆地斜坡区大型坡折带控制沉积体系与微相砂体分布。研究结果表明:四川盆地川中地区须家河组四段沉积期为前陆斜坡背景,发育大型坡折带,在此背景下发育远源辫状河三角洲沉积体系,以辫状河三角洲前缘亚相沉积为主,可进一步识别出内前缘带和外前缘带,以及水下分流河道、砂坝、分流间湾和席状砂等4种沉积微相。坡折带之上主要发育三角洲内前缘带水下分流河道微相,坡折带之下主要发育三角洲外前缘带水下分流河道与砂坝复合砂体。坡折带之下的砂坝微相砂体具备良好的侧向遮挡条件,顶底板条件优越,有利于形成岩性圈闭,且紧邻川西凹陷烃源灶,为下一步最有利勘探领域。

人工智能测井:基础、原理、技术及应用

【背景】油气勘探开发的智能化已成为油气工业发展趋势与研究热点。人工智能测井(Artificial intelligence logging,AIL)具有解决非常规油气资源及深地深海等复杂环境勘探开发难题的巨大潜力。然而,AIL技术发展的驱动模式,以及技术发展的基础、实现原理、技术组成以及应用场景还没有开展研究。【目的和方法】为构建完善的AIL测井体系生态,充分挖掘并展现AIL技术的潜力与价值,采用文献分析、理论研究、技术分析以及实例验证的方法。首先从多个维度出发,深入剖析了测井技术与人工智能(Artificial intelligence,AI)融合发展的关键因素,并据此定义了AIL。随后,系统探讨了AIL的基础理论框架、硬件算力需求以及数据物理模型,并通过知识发现的视角,详细阐述了测井方法、仪器、岩石物理及解释等环节在AIL体系中的功能实现机制。在技术层面,深入分析了包括测井大数据技术、智能与快速算法、测井知识图谱、数字孪生、智能仪器及测井物联网在内的多项关键技术,并指出物理模型与智能算法是推动AIL技术发展的核心驱动力。根据AI算法的原理与特性,系统梳理了AIL在测井方法、仪器、采集作业及解释等方面的关键技术,并构建了测井知识图谱树状图及其求解流程。【结果和结论】通过实证研究,验证了AIL在致密砂岩岩性识别及测井模拟中的优势,其精度达到93.8%,明显优于传统方法。在测井评价方面,AIL可同时实现储层和流体的识别,这充分说明了AIL技术的巨大发展潜力与应用优势。基于AIL技术的关键节点,展望了测井技术发展的第五个发展阶段,即智能测井。研究成果为AI在测井领域的深度融合与广泛应用提供坚实的理论基础与实践指导,对促进人工智能测井技术的推广及发展具有重要意义。

高精度层序约束下三角洲-滩坝沉积体系精细刻画与岩性圈闭分布规律——以渤海湾盆地济阳坳陷东营凹陷南坡东段沙河街组四段上亚段为例

为研究断陷盆地斜坡带低位体系域岩性圈闭发育,以渤海湾盆地济阳坳陷东营凹陷南坡东段沙河街组四段上亚段(沙四上亚段)低位体系域为研究对象,利用岩心、测录井资料,开展了高精度层序划分对比、层序动态演化和沉积微相平面精细刻画研究。研究表明:沙四上亚段低位体系域划分为3个准层序组、9个准层序,发育6种准层序、4种准层序组以及5种体系域地层叠加样式,经历9次准层序级别相对湖平面升降,在相对湖平面下降期物源供给充足,平面上由盆缘进积为主型向盆内进积型过渡分布。主要发育三角洲-滩坝沉积体系,包括扇三角洲、三角洲和滩坝3种沉积相以及7种沉积微相类型。东营凹陷南坡东段沙四上亚段低位体系域内部以坝主体和滩脊微相尖灭砂体为储集体,以准层序和准层序组底部湖侵泥岩为局部盖层、水进体系域泥岩为区域盖层,形成岩性圈闭。

渤海湾盆地石臼坨凸起秦皇岛27-3大型油田发现与地质新认识

渤海湾盆地石臼坨凸起历经50余年勘探,在凸起高部位背斜区发现了3个浅层亿吨级大油田,而低部位斜坡区浅层由于构造圈闭不发育,勘探程度较低,近10年无规模性发现。随着渤海海域勘探程度提高,现已全面进入岩性勘探阶段,针对石臼坨凸起东段顺向断裂斜坡区浅层油气运移、岩性圈闭刻画和油气成藏规律等展开了深入系统研究。研究认为:(1)研究区南北两侧被富生烃凹陷夹持,凸起边界大断层晚期强烈活动和陡坡带近源扇体普遍发育使凸起区成为规模性油气运聚的最终指向区;(2)凸起边界大断层在馆陶组开启系数最小,馆陶组含砾砂岩输导层是石臼坨凸起之上主要的油气横向运移通道;(3)馆陶组输导脊坡度和切脊断层组合控制顺向斜坡区油气的垂向输导,当坡度小于1°且断层长度大于2.50 km、成藏期断距大于40 m时斜坡区可产生规模性的油气垂向运移,突破顺向断裂斜坡区“过路不留”的传统认识;(4)在凸起斜坡区,与构造脊方向斜交的砂体有利于油气保存,同时,提出井约束谱蓝化整形高分辨率处理技术,实现了对斜坡区岩性圈闭有效刻画,优选出保存条件较好的斜向砂体开展钻探部署。基于上述新认识、新技术,2023年在石臼坨凸起东段顺向斜坡区成功评价了秦皇岛27-3亿吨级油田,实现了勘探老区浅层挖潜的重大突破,为渤海湾盆地高成熟探区持续油气发现提供了借鉴。

基于沉积学原理的被动陆缘陆坡古地貌恢复方法

深入了解被动陆缘陆坡古地貌如何控制深水重力流储层的形成与分布对深水油气勘探意义重大。在少井探区,基于三维地震的地层厚度印模法在古地貌研究中应用广泛,但是,陆坡区容易因沉积物供给不足而处于“半饥饿欠补偿”状态和陆坡地形坡度的存在会影响该方法的适用性和准确性,对沉积体系和油气储层的分布特征分析产生不利影响。为此,根据沉积型陆坡的特点,对地层厚度印模法进行了两方面的补充与改进:其一,通过三维地震资料的分析明确目的层陆坡补偿状态,讨论了地层厚度印模法的适用性;其二,根据研究区陆坡演化过程,以沉积物体积等分方式求取目的层段各层序对应的潜在坡度趋势,基于此实现古陆坡地形坡度校正。利用改进后的方法对非洲西部尼日尔三角洲盆地下陆坡古地貌进行恢复的结果与研究区现有构造演化认识高度一致,符合“构造活动主导地貌特征”这一普遍认识。另外,地震属性刻画出的深水沉积体系分布特征与古地貌恢复结果间存在良好的耦合关系。应用实例证明了改进方法的科学性和研究区古地貌恢复结果的客观性。

哈萨克斯坦南图尔盖盆地Doshan斜坡带岩性油气藏储层预测方法

综合利用钻井、测井、地震等资料,分析了哈萨克斯坦南图尔盖盆地Doshan区块中部斜坡带沉积特征,并提出了一种岩性油气藏储层预测方法,识别出岩性圈闭,地震属性分析验证了储层预测结果的可靠性。研究结果表明:(1)哈萨克斯坦南图尔盖盆地Doshan斜坡带中—下侏罗统沉积时构造活动强烈,发育少量断裂,以湖相沉积为主,可分为SQ4—SQ6共3个沉积期,分别对应埃巴林组(J_(1)ab)、多尚组(J_(2)ds)和卡拉甘塞组(J_(2)kr),SQ6时期发生大规模湖侵,扇三角洲呈裙带状展布在边缘断层一侧,半深湖范围扩大;三角洲前缘为岩性圈闭发育的有利相带。(2)储层预测方法为以井-震标定结果确定地层界线,以基于声波曲线重构的岩石物理分析校正井径的影响,以基于调谐厚度的正演模型分析识别砂体,以高分辨率岩性储层地震反演技术对单砂层进行识别。(3)研究区岩性圈闭主要分布于中—下侏罗统,发育于坡折控砂条件下的一系列构造带上。地震属性分析结果与沉积特征吻合度较高。(4)研究区中—下侏罗统的坡折位置发育一系列岩性圈闭,在高分辨率地震剖面上表现为强振幅、高阻抗特征,是勘探有利区。

A Novel Three-stage Tectonic Model for Mississippi Valleytype Zn-Pb Deposits in Orogenic Fold-and-Thrust Belts

Mississippi Valley-type(MVT) Zn-Pb deposits predominantly form within both orogenic forelands and fold-andthrust belts, yet the mineralization process within the latter tectonic setting remains inadequately understood. This study, through a comprehensive review of MVT deposits across global fold-and-thrust belts, introduces a novel model elucidating the mineralization process in the context of tectonic belt evolution. It is demonstrated that during the stage Ⅰ, regional compression is introduced by early stages of plate convergence, causing the folding and thrusting and creating structural or lithological traps such as evaporite diapirs and unconformity-related carbonate dissolution-collapse structures. Thereafter, in stage Ⅱ, hydrocarbons begin to migrate and accumulate within these traps, where reduced sulfur is generated through thermochemical or bacterial sulfate reduction concurrent with or preceding Zn-Pb mineralization. In the subsequent stage Ⅲ, as plate convergence persists, the regional stress transitions from compression to transpression or extension. Under these conditions, steeply-dipping extensional faults are generated, facilitating the ascent of metalliferous brines into early-formed structural or lithological traps. Precipitation of Zn and Pb sulfides occurs through the mixing of Zn-Pb-transporting fluids with pre-existing reduced sulfur or by interaction with hydrocarbons.

Outcrops as windows to petroleum systems:Insights from the southern Bida Basin,Nigeria

The study assessed petroleum systems in the southern Bida Basin,Nigeria,focusing on the Cretaceous sediments.Reservoirs comprise Lokoja and Patti Formation sandstones,while shales,claystone,and siltstone serve as source rocks and stratigraphic traps/seals.Detailed studies delineating the key elements of the petroleum systems in the basin have not been conducted due to a lack of subsurface data.The goal of the current study was to use field observations,Scanning Electron Microscopy(SEM),X-ray diffraction(XRD),and geochemical and geomechanical data to evaluate key components of petroleum systems in the southern Bida Basin.The results presented in this investigation are intended to attain specific objectives,especially those lacking in the basin's study sections.Petrophysical analysis revealed that the Lokoja Sandstone has porosity of 37%-39.5%and moderate permeability of 23.22-42.29 mD.The Patti Formation sandstone reservoirs exhibited high porosity(38%-42%)and moderate to good permeability(31.54-66.48 mD),suggesting good potential reservoirs.SEM results revealed intragranular pores and micro-fractures in the Patti Shale,whereas the sandstone reservoirs in the Lokoja and Patti formations displayed fractures,facilitating hydrocarbon migration.Quartz was the dominant mineral in the sandstone units of both formations.XRD analysis revealed that brittle and clay minerals influenced the microstructure of Patti Shale.Geochemical analysis indicated promising petroleum potential in the Patti Shale,with a total organic carbon(TOC)content of 1.87 wt%,free hydrocarbon from kerogen(S1)of 0.41 mg/g,hydrogen index(HI)of 0.75 mg HC/g TOC,and production index(PI)of 0.17.The Patti and Lokoja formations'shale,claystone,and siltstone exhibited sealing potential,with a plasticity index of 24-35 and coefficient permeability of 2.8×10^(-4)-3.6×10^(-4)cm/s.Field studies,XRD,geochemical data,and geomechanical index values have confirmed the key components of the petroleum system,which in turn facilitate hydrocarbon generation,migration,accumulation,and entrapment in the basin.

岩性圈闭型压缩气体地质储能场地适宜性评价方法及应用研究

针对目前岩性圈闭型压缩气体地质储能场地适宜性评价多基于静态因素,缺乏动态多因素的耦合分析,导致评估结果与实际工程应用存在较大差异这一问题,开展细化储能场地适宜性评价方法研究。通过考虑储气层储集性、储能安全性、实际操作性等方面,提出场地静态可行性分析与动态性能评估相结合的方法,并以胜利油田孤东辖区A2砂体为例开展应用研究。通过场地地质特征静态分析、GPSFLOW数值模拟软件定量评价以及现场先导性注气试验评估,结果显示A2砂体井口压力在注入标况空气9.4×10^(4)m^(3)结束后下降8.16%,显示密封性良好,符合储能空间要求。表明考虑储能系统动态性能的场地适宜性评价方法可为项目的选址和建设、储能效率的评价及优化提供更准确的数据支撑,有利于促进清洁能源利用与能源转型的可持续发展。

北部湾盆地涠西南凹陷涠洲组断裂—岩性复合圈闭发育模式与勘探实践

为了解决北部湾盆地涠西南凹陷勘探目标搜索和油田可持续开发难度大的问题,对该区二号断裂带渐新统涠洲组三段构造圈闭发育层段开展了断裂—岩性复合圈闭研究。通过对控洼断裂演化与涠三段沉积特征关系的研究,发现涠三段沉积期二号断裂带活动性较弱,凹陷长轴方向辫状河三角洲水下分流河道向洼中持续推进;涠二段、涠一段沉积期区域构造活动强烈,产生一系列雁列式断裂,辫状河三角洲前缘形成的相对孤立的水下分流河道与呈雁列式断裂形成角度交错相互切割,从而形成了NE—SW向靠断层封堵、NW—SE向靠砂体尖灭的特色河道型构造—岩性圈闭群。研究表明:(1)涠三段发育“二号断裂带洼中断隆背景、低频摆动水道、雁列张扭断裂”三因素耦合的断裂—岩性型圈闭模式,辫状河三角洲水下分流河道主流线与二号断裂带的交会区是构造—岩性圈闭有利发育区带;(2)近物源交会区主要发育复合型构造—岩性圈闭,远物源交会区主要发育孤立型构造—岩性圈闭,建立了凹陷轴向河道控砂,断裂、砂体复合控藏的成藏模式。断裂—岩性型圈闭模式和成藏模式应用效果好,搜索了一批NE—SW向靠断层封堵、NW—SE向靠砂体尖灭的有利断裂—岩性复合圈闭群,并在涠B-E构造得到很好的应用,WB-E 1井钻遇油层近100 m,后续多口井钻探成功,新增油气探明地质储量超千万立方米,证实二号断裂带涠三段断裂—岩性复合圈闭是重要的勘探领域。

玛湖446井区克拉玛依组储层特征及有利区预测

玛湖斜坡446井区克拉玛依组是克拉玛依油田重要的产油层,三叠系克上组(克拉玛依组上段)有利砂体的准确刻画一直是制约该区增储上产的关键问题。笔者基于对克上组沉积储层特征的重新认识和有利砂体地球物理相应特征的再梳理,结合沉积相展布特征和地震反演方法,对446井区克上组T_(2)k_(2)^(2)段有利砂体进行了刻画,为进一步勘探开发提供了重要指导。研究发现,玛湖446井区属于辫状河三角洲前缘亚相沉积,包括水下分流河道、水下分流河道间湾、河口砂坝、席状砂4种沉积微相,其中水下分流河道为有利储层。T_(2)k_(2)^(2)段水下分流河道最发育,物源整体来自WN方向,中部河道最发育,沉积背景最为有利。拟声阻抗地震反演方法对识别T_(2)k_(2)^(2)砂体具有显著效果,砂体阻抗界限在8900 g/cm^(3)·m/s,可在本区识别出两套有利的河道砂体,具有强振幅和高拟声波阻抗的特征。综合考虑沉积相展布、地震反演和构造特征,预测了T_(2)k_(2)^(2)段控制含油面积以外的一个岩性圈闭及范围,该圈闭呈U型展布,发育约为6 m油层,由高往低油层减薄,面积为8.4 km2,闭合度约为300 m。

渤海油田新近系地层剖面智能化建立方法及应用

随着钻井作业优快发展,新近系浅层探井钻井作业周期大幅缩短,导致砂泥岩难区分,岩性分层不准确,录井剖面符合率低。为解决这项难题,实现新近系地层岩性剖面的准确构建,提出基于钻压、扭矩、钻时的组合参数SI指数与扭矩曲线交会方法实时构建录井剖面,使录井剖面绘制可以随钻实时进行,做到了录井剖面绘制及时、高效,实现了精细化岩性分层。该方法在渤海油田应用超100口井,地质录井剖面符合率提升15%~23%,为智能化录井奠定了基础。