伊通盆地大南洼陷储层预测及有利区块识别

发布时间：2018-03-13 13:12

本文选题：储层预测　切入点：地震属性分析　出处：《长江大学》2015年硕士论文　论文类型：学位论文

【摘要】：地震储层预测是以高分辨率地震和测井资料为基础,以地质与钻井资料为参考,波阻抗反演和属性分析为主要技术来进行的,因此,波阻抗反演的效果和属性参数的运用成为储层预测的关键。大南洼陷地区是一个陆相断陷盆地,区内构造比较复杂,整体断裂较为发育,具有发育地层岩性圈闭的有利条件。而地层岩性圈闭的落实和评价缺乏有效的技术手段,其中最为突出的是构造细节不清,有利沉积相带和有效储层发育范围不明确,地层岩性圈闭成藏规律不明确等。通过本次分析研究得知,大南洼陷双二段的油气显示结果最好,其次为双一段,最差的为双三段。双阳组油气主要分布在研究区北部,中部和南部钻井较少,尤其是南部几乎是空白。鹿乡断陷双阳组烃源岩条件较好,暗色泥岩厚度大,有机质丰度中等,且处于成熟阶段。其中双三段暗色泥岩厚度最大,其次为双一段；双一段和双二段有机质丰度和有机质成熟度略高于双三段。综合评价表明,双一段为最有利生油层位,其次是双三段；鹿乡断陷大南洼陷为最有利生油区,其次为盆地西南部及盆地中北部部分地区,东部为相对较差生油区。鹿乡断陷双阳组储层成因类型主要为扇三角洲和水下扇砂体,构造主要以断块圈闭为主。本次研究充分利用现有各种资料,以地质、测井、油藏工程等多学科为理论指导,综合应用钻井、地震、测井、化验分析及生产动态资料,以大南洼陷为主要研究区,重点对基岩潜山、双一段底砾岩、双二段砂岩和奢一段扇体展开工作,形成了一套较完整的研究方法,较好的指导了该区的分析研究,研究方法也可以为其它工区开展类似研究作为借鉴。通过本次研究,取得的主要成果及认识如下：1、根据大南洼陷的资料分析,结合以往该区的地质、沉积方面的解释成果,综合层序界面、内部结构以及沉积演化的特点,双阳组至万昌组可归结为双阳组、奢岭组、永吉组、万昌组等四个二级层序,10个三级层序。2、从地层对比分析来看,双阳组在大南洼陷全区范围内均有分布,厚度变化较大,钻井揭露厚度为500-600m,岩性为黑-灰色泥岩、粉砂岩、细砂岩-砂砾岩,底部为砾岩。纵向上分为三个岩性段,与下伏前第三系呈不整合接触。3、根据地震速度谱解释结果分析,建立了全区的3D平均速度场。通过对地震速度场提取的时深曲线和声波测井计算的时深曲线对比分析得知,速度趋势基本一致,误差较小,为构造解释和储层预测提供了可靠的3D速度场资料。4、大南洼陷是受控于西北缘及东南缘断层挤压形成,构造后期改造作用比较大；研究区圈闭基本上分为3类：构造圈闭、地层圈闭和岩性圈闭。5、工区双阳组地层砂岩储层比较发育,多集中在西北和东南两大断层附近,从反演获得的砂岩厚度分析图看出,双二段砂岩厚度最大达到将近400m,在X27井区块和洼陷的南部砂岩较厚,在2号断层附近砂岩相对偏薄,统计计算的结果和钻井实际获得的砂岩厚度对比,吻合率达到80%以上；双一段砂体发育比较均一,砂体的最大厚度将近200m,这个厚度也只是在L2井区附近出现,其它部位砂岩厚度都是在50-100m之间。6、工区油层主要在奢岭组和双阳组,特点是油层多而薄,油藏以构造-岩性为主：生油层主要是在双一段上部泥岩和双三段的大套泥岩,储层以双一段底砾岩和双二段的砂岩为主,洼陷的沉积中心由早期的南面逐渐往北迁移,形成目前的格局。7、合适的研究方法将是这种小型洼陷寻找有利目标的重要手段。本次研究工作针对大南洼陷的地震、地质资料特点,以层序地层学理论、断陷盆地沉积模式为指导,在等时地层格架基础上对大南洼陷整体开展构造、储层、油气成藏及油气分布规律研究,同时寻找到适合本地区的反演方法和敏感属性,确立了有利区带。
[Abstract]:Seismic reservoir prediction is based on the high resolution seismic and well logging data, geological and drilling data as a reference, wave impedance inversion and attribute analysis is the main technique to use, therefore, the effect of wave impedance inversion and attribute parameter becomes the key of reservoir prediction. The south region is a sag faulted basin a continental area, the complex structure, the overall fracture more developed, with favorable conditions for the development of stratigraphic and lithologic traps. And the implementation and evaluation of lithologic stratigraphic traps and lack of effective technical means, the most prominent is the details are not clear, the favorable sedimentary facies and reservoir development scope is not clear, stratigraphic and lithologic traps accumulation is not clear. Through the research and analysis that the oil and gas in South double two section showed the best, followed by the first member, the worst for the double three. Shuangyang oil is mainly distributed in the study group Area in the northern, central and southern less drilling, especially the south is almost blank. In the condition of hydrocarbon source rocks of Shuangyang Formation in Luxiang fault well. The thickness of dark mudstone, organic matter abundance, and in the mature phase. The thickness of dark mudstone double three maximum, followed by a pair of double and double segment; the two section of the abundance of organic matter and organic matter maturity is slightly higher than the double three. Comprehensive evaluation shows that the first member for the most favorable source reservoir, followed by the double three section; Lu Xiang rift South sag is the most favorable source areas, followed by parts of the northern basin and the southwest, East is relatively poor source Lu Xiang rift area. Genetic type reservoir of Shuangyang Formation is mainly fan delta and underwater fan sand body structure, mainly in fault block traps. This study makes full use of the existing data, based on geological, logging, reservoir engineering and other disciplines as the theoretical guidance, the comprehensive application of drilling Well, well logging, seismic, laboratory analysis and dynamic production data, to the South sag is the main research area, focusing on the bedrock of Qianshan, the first member of two double bottom conglomerate, sandstone and a luxury fan work, formed a relatively complete set of research methods, better guidance to the analysis and Research on this area. The research method can also be used as reference for other similar research work area. Through this study, the main results are as follows: 1, according to the analysis of the South sag, combined with the previous data, the geological deposition, the interpretation results of interface layer order, the internal structure and sedimentary evolution characteristics of Shuangyang Formation to Wanchang group can be attributed to the Shuangyang group, Sheling group, Yongji group, Wanchang group four two level sequence, 10 three level sequence from.2, stratigraphic correlation analysis, Shuangyang group were distributed in the south in the region, large variation of thickness, drilling Expose the thickness of 500-600m, the lithology is black and grey mudstone, siltstone, fine sandstone, glutenite, bottom conglomerate. Vertically divided into three lithologic sections, has an unconformable contact with the underlying.3 before third, according to the interpretation of the results of seismic velocity spectrum analysis, 3D was established by average velocity field in the region. The calculation of seismic velocity field extraction time depth curve and acoustic logging time depth curve comparison analysis showed that the speed of a similar trend, less error, provides the reliable data of.4 3D velocity field for structural interpretation and reservoir prediction, the South sag is controlled by the northwestern and southeastern fault extrusion to form the late reformation, construction relatively large; the traps are basically divided into 3 categories: structural traps, stratigraphic traps and lithologic traps in.5 area, Shuangyang Formation sandstone reservoir development, more concentrated in the vicinity of the northwest and Southeast two faults, retrieved from sandstone The thickness of sandstone thickness analysis diagram, double two maximum reached nearly 400m in X27 well block and the southern sag are thick sandstone, in the vicinity of fault No. 2 relatively thin sandstone, sandstone thickness contrast statistical calculation results and actual drilling is obtained, the coincidence rate reached above 80%; a double sand body development uniform, the maximum thickness of sand body thickness is nearly 200m, this also appeared in the vicinity of L2 well area, other parts of the sandstone thickness are between 50-100m.6, the main reservoir area in Shuangyang Sheling group and group, and is characterized in multi layer thin reservoir to lithologic reservoir is mainly in the main: the first member the upper mudstone and double three section of mudstone, reservoir in the first member and the two section of the double bottom conglomerate sandstone, the sedimentary center in the south to the north gradually from early migration, formation of the current pattern of.7, the appropriate research methods will be the small wa In an important means to find favorable targets. The research work in the South sag of the earthquake, the geological data characteristics, the theory of sequence stratigraphy, sedimentary rift basin model as a guide, stratigraphic framework on the basis of the overall development structure in the South sag, such as reservoir, oil and gas and oil and gas distribution of reservoirs. At the same time to find the inversion method for the region and the sensitive attribute, establish favorable zones.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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