北部湾盆地防塌型无固相有机盐钻井液技术          下载免费PDF全文

陈江华  赵宝祥  徐一龙  鹿传世  吴江  郑浩鹏 《探矿工程》2014,41(2):4-9

南海西部油田的北部湾盆地储层段地质情况复杂,夹层多,泥岩极易水化,钻井液体系维护难度大,难以兼顾井壁稳定与储层保护。以涠洲6-9/6-10油田为例,介绍了北部湾盆地储层段的地质概况和钻井液技术难点;介绍了研发的一种新型无固相有机盐防塌钻井液体系及其实验评价结果。该钻井液体系既有效解决了北部湾盆地复杂储层段砂泥岩互层井壁失稳的问题,又防止了储层污染,还降低了井下复杂情况的发生率。该技术为北部湾盆地的石油勘探开发提供了强有力的技术保障。  相似文献   

深水浊流形成过程的水动力学模拟:以南海北部琼东南盆地浊流形成过程为例   总被引：2，自引：1，他引：1  

姜涛  张迎朝  汤苏林  张道军  左倩媚  林为人  王亚辉  孙辉  王博 《海洋学报(英文版)》2014,33(12):127-137

Turbidity currents represent a major agent for sediment transport in lakes, seas and oceans. In particu-lar, they formulate the most significant clastic accumulations in the deep sea, which become many of the world＇s most important hydrocarbon reservoirs. Several boreholes in the Qiongdongnan Basin, the north-western South China Sea, have recently revealed turbidity current deposits as significant hydrocarbon res-ervoirs. However, there are some arguments for the potential provenances. To solve this problem, it is es-sential to delineate their sedimentary processes as well as to evaluate their qualities as reservoir. Numerical simulations have been developed rapidly over the last several years, offering insights into turbidity current behaviors, as geologically significant turbidity currents are difficult to directly investigate due to their large scale and often destructive nature. Combined with the interpretation of the turbidity system based on high-resolution 3D seismic data, the paleotophography is acquired via a back-stripping seismic profile integrated with a borehole, i.e., Well A, in the western Qiongdongnan Basin; then a numerical model is built on the basis of this back-stripped profile. After defining the various turbidity current initial boundary conditions, includ-ing grain size, velocity and sediment concentration, the structures and behaviors of turbidity currents are investigated via numerical simulation software ANSYS FLUENT. Finally, the simulated turbidity deposits are compared with the interpreted sedimentary bodies based on 3D seismic data and the potential provenances of the revealed turbidites by Well A are discussed in details. The simulation results indicate that a sedimen-tary body develops far away from its source with an average grain size of 0.1 mm, i.e., sand-size sediment. Taking into account the location and orientation of the simulated seismic line, the consistence between normal forward simulation results and the revealed cores in Well A indicates that the turbidites should ha  相似文献   

Depositional characteristics and accumulation model of gas hydrates in northern South China Sea     

《Marine and Petroleum Geology》2014

The South China Sea (SCS) shows favorable conditions for gas hydrate accumulation and exploration prospects. Bottom simulating reflectors (BSRs) are widely distributed in the SCS. Using seismic and sequence stratigraphy, the spatial distribution of BSRs has been determined in three sequences deposited since the Late Miocene. The features of gas hydrate accumulations in northern SCS were systematically analyzed by an integrated analysis of gas source conditions, migration pathways, heat flow values, occurrence characteristics, and depositional conditions (including depositional facies, rates of deposition, sand content, and lithological features) as well as some depositional bodies (structural slopes, slump blocks, and sediment waves). This research shows that particular geological controls are important for the presence of BSRs in the SCS, not so much the basic thermodynamic controls such as temperature, pressure and a gas source. Based on this, a typical depositional accumulation model has been established. This model summarizes the distribution of each depositional system in the continental shelf, continental slope, and continental rise, and also shows the typical elements of gas hydrate accumulations. BSRs appear to commonly occur more in slope-break zones, deep-water gravity flows, and contourites. The gas hydrate-bearing sediments in the Shenhu drilling area mostly contain silt or clay, with a silt content of about 70%. In the continental shelf, BSRs are laterally continuous, and the key to gas hydrate formation and accumulation lies in gas transportation and migration conditions. In the continental slope, a majority of the BSRs are associated with zones of steep and rough relief with long-term alternation of uplift and subsidence. Rapid sediment unloading can provide a favorable sedimentary reservoir for gas hydrates. In the continental rise, BSRs occur in the sediments of submarine fans, turbidity currents.  相似文献   

MDT测试资料确定气水界面的方法研究     

王文涛  张辉  李华  李浩  刘东华 《海洋地质译丛》2014,(2):69-72

通过对MDT测压资料的分析,发现了造成测试点压力值存在误差的主要原因有两个方面：一方面是由于部分测压点储层物性差,测试探针抽吸地层流体后储层压力恢复需要的时间较长,然而由于实际原因测试压力恢复无法等待足够的测试时间;另一方面是由于部分物性较差储层较难形成好的泥饼,以至于受到比较严重的泥浆侵入使得测试点产生超压现象,测试得到的地层压力和实际压力相比偏大.同时分析发现物性较好的储层往往能够得到相对可靠的测试压力.合理的气水界面对于计算探明地质储量有着很重要的意义,尤其是高温高压气田,气水过渡带往往较大,可能会达到30m左右,这种情况下无法仅从钻遇情况分析气水界面,此时可以结合MDT测压资料分析气水界面,从而确定合理的地质储量.通过分析实际MDT测压资料,对不同测压点进行了误差分析并在此基础上提出了压力数据点的筛选原则.通过实际检验认为新的回归方法确定出的气水界面科学合理.  相似文献   

琼东南盆地深水区长昌凹陷勘探潜力   总被引：1，自引：0，他引：1  

程光华  王丽 《海洋地质前沿》2014,30(4):28-32

长昌凹陷位于琼东南盆地深水区中央坳陷东部,是深水勘探新区。通过对凹陷成藏条件分析认为,长昌凹陷供烃充足;存在三角洲砂岩、滨海相砂岩、海底扇及水道砂岩等4种类型储层,且储盖组合发育;发育多层系构造圈闭,面积普遍较大;油气成藏条件优越。在上述研究基础上,对长昌凹陷A、B、C、D、E 5个次一级洼陷勘探潜力进行了评价,认为长昌环A洼成藏特征好,发育大型有利目标。落实万宁X-1、万宁X-2、长昌X-1等多个大中型"构造+岩性"圈闭,圈闭含油气信息好,潜在资源量大,是琼东南盆地深水区下步勘探的重点。  相似文献   

Hydraulic套管开窗工具在南海西部油田的首次应用     

赵苏文  段泽辉  顾纯巍  罗鸣  徐一龙 《海洋地质译丛》2010,(3):84-87

南海西部油田的涠洲11-1N-A12井是一口探边注水井,该井采用威德福公司最新型的液压磨铣套管开窗工具在9-5/8＂套管内进行开窗侧钻,仅用一趟钻就实现了定向、座挂、开窗、修窗和钻进新地层14.12 m,大大节约了钻井时间。介绍了威德福公司的Hydraulic套管开窗系统的组成部件及工具的优点,分析了如何在开窗作业过程中进行钻井参数控制,总结了关于工具的送入、脱手、定向和窗口质量控制等方面的一些经验,可以为以后类似井的套管开窗作业提供技术参考。  相似文献   

扬马延海脊构造-沉积演化及油气潜力     

成林  袁炳强  张春灌  许文强  鲁海鸥 《现代地质》2017,31(3):450

扬马延海脊位于北大西洋的北极圈附近,东格陵兰板块和挪威板块之间,冰岛东北方向。北极地区地域辽阔,油气资源丰富,但是恶劣的环境一直制约油气的勘探进展。在扬马延海脊的沉积演化过程中,扬马延海脊在第三纪前有着和东格陵兰陆架、挪威陆架相似的沉积序列,其构造演化经历了二叠纪陆内裂谷、三叠纪—侏罗纪同裂谷和微陆块漂移、白垩纪至今热沉降和被动陆缘等3个阶段。结合前人研究成果,对搜集的东格陵兰陆架、挪威陆架的油气地质资料分析,认为扬马延海脊可划分为扬马延盆地、扬马延西部构造带、扬马延中部凸起带、扬马延海槽、扬马延东部斜坡、扬马延南部复杂构造带6个构造单元,在其上发育着2套油气系统。同时扬马延海脊发育有伸展构造圈闭、地垒断块圈闭、构造圈闭和地层圈闭,这些圈闭为油气的赋存提供了良好的环境,也有利于划分有利油气勘探区带。研究结果可为进一步分析扬马延海脊构造特征等方面提供基础信息,同时对我国参与研究开发北极油气资源具有重大意义。  相似文献   

琼东南盆地新近系莺二段物源体系及其控制下的深水重力流沉积   总被引：1，自引：0，他引：1  

康丽芳  左倩媚  王振国  何小胡  宋爱学 《海洋学报》2021,43(3):62-75

近年来在琼东南盆地超深水区莺歌海组发现了多个深水气藏,展现了广阔的勘探前景。但随着油气勘探进一步推进,关于莺二段的储层物性问题日益凸显,严重制约了下一步的勘探进程。本文研究基于前人总结的区域地质资料,结合岩芯、测井和三维地震等资料,建立了莺二段三级层序格架,综合分析了层序格架内物源体系及其控制下的重力流沉积特征。研究表明,重力流沉积体系主要发育在莺二段下、中层序,具有南、北、轴向三大物源体系。不同物源体系控制了重力流储集体的空间展布和沉积特征:(1)南物源控制的海底峡谷充填深海泥岩,而北物源控制的海底峡谷充填的厚层浊积水道砂岩,孔渗物性好,是良好的储集层;(2)轴向物源影响的溢岸漫滩沉积,由于物性条件好,可以作为良好的油气储层;(3)南物源控制海底扇砂岩的厚度薄、粒度细、泥质含量较高,而北物源和轴向物源供应的海底峡谷和海底扇朵体的砂体面积广、厚度大、粒度粗、物性好,是深水区莺二段最重要的优质产气储层。  相似文献   

涠西南凹陷涠洲11区南部流沙港组流一段沉积微相特征   总被引：1，自引：0，他引：1       下载免费PDF全文

谭程鹏  李茂  于兴河  李胜利  程岳宏 《沉积与特提斯地质》2012,32(1):62-71

涠西南凹陷涠洲11区南部流沙港组油气特征明显,但目的层段岩性复杂,储层横向变化快,连通性差,因此对沉积微相与砂体的成因分析很有必要。本文通过岩心精细观察描述,结合粒度资料、测井资料和地震资料的分析,对流一段沉积相类型进行了探讨,识别出两种沉积相类型：水进型扇三角洲和正常三角洲。其中扇三角洲可划分为扇中和扇端两个亚相,三角洲划分为三角洲前缘和前三角洲两个亚相,并在各相带内共识别出11种微相类型。探讨了流一段4个亚段的沉积微相特征、平面展布及垂向演化：早期（L1下）为湖平面逐渐上升的扇三角洲沉积,晚期（L1h ）为不断向前讲积的三角洲沉积。  相似文献   

琼东南盆地井震平均速度误差分析及校正          下载免费PDF全文

王丽君  李强  刘爱群 《江苏地质》2012,36(2):142-146

琼东南盆地是南海深水勘探的重要目标,该盆地目前情况是钻井较少,勘探程度较低,勘探前景广阔。时深转换一直是琼东南盆地研究工作的重点,其中速度作为解释成果从时间到深度转换的重要桥梁,对于地质构造的勘探、钻孔的布置和设计都起着决定性的作用。琼东南盆地横向上平均速度变化较大,且井上速度与地震速度之间存在着井震误差。据统计分析发现,该区井震误差主要有3种类型,按形态特征分别命名为铁轨差、喇叭口差、剪刀差。研究了不同类型误差的校正方法,再应用于琼东南盆地深水区YL1井的时深关系预测,钻井结果证实预测时深关系准确。  相似文献