大庆长垣南部敖南地区扶余油层沉积微相研究

发布时间：2018-04-02 19:21

本文选题：敖南地区　切入点：扶余油层　出处：《成都理工大学》2015年硕士论文

【摘要】：敖南研究区位于松辽盆地北部大庆长垣南部,跨齐家古龙凹陷、大庆长垣、三肇凹陷、朝阳沟阶地四个二级构造带,该区生油层为青山口组,研究目的层为扶余油层。前人针对长垣南部各个工区进行了大量研究,但对整个敖南地区的研究还缺乏认识,主要是沉积单元划分和沉积微相展布特征需要进一步明确。就敖南地区油气资源丰富,但对沉积微相的研究缺乏系统性认识,本论文对研究区开展高分辨率层序地层划分对比和沉积微相的研究,为认识该区沉积相展布及发育情况提供了依据,为油气资源进一步勘探开发提供理论基础。在调研了前人对该区的研究成果、构造演化特征及区域沉积背景的基础上,以松辽盆地北部大庆长垣南部敖南地区扶余油层为研究对象,结合地震、岩心、录井、测井等地质资料,以高分辨率层序地层学、测井地质学和沉积学为指导,对研究区扶余油层的细分对比和沉积微相划分进行深入细致的研究,明确扶余油层沉积微相发育平面展布特征及演化规律。经过研究,建立了以高分辨率层序为基础的扶余油层井震结合细分对比思路和方法,完善了沉积微相研究方法,研究中完成了六个地震工区315口井分层对比工作,实现了长垣南部地区扶余油层从5分到12分整体闭合统一对比分层,为细分沉积微相和认识微相演化规律奠定了基础。并得到以下结论:(1)研究区发育5个中期旋回界面,其中FI1、FI3、FII2底为沉积转换面,地震剖面中连续、弱振幅;FI2、FII1底为湖泛面,地震剖面中连续、中振幅;12个超短期旋回界面,主要为岩性突变面或洪泛面。(2)研究区主要发育曲流河、三角洲前缘和三角洲平原3种沉积亚相,19种沉积微相;发育块状(粉砂质)泥岩、含钙(泥质)粉砂岩、槽状交错层理粉砂岩、平行层理细砂岩4种沉积岩相。(3)研究区FII2和FII1时期以西北部和东北部物源为主,FI3至FI1时期西南部物源逐渐发育,以较强势头向北延伸,北部物源逐渐减弱,FI1时期发育了东南部物源逐渐发育。总体上来讲,葡南西部和新肇工区以西北部物源沉积为主;葡南东部和空白区北部以东北部物源沉积为主;敖南大部分、敖9、茂兴、葡351工区以西南部和南部物源为主,敖南东南部受南部及东南部物源控制。研究区属多物源沉积体系,发育西南和西北两大物源,局部发育东南和东北物源,呈“南强北弱”趋势演化。(4)研究区FI和FII属于整体持续性水进沉积体,自下而上经历了河流、三角洲平原、三角洲前缘亚相沉积演化过程。FII2-2至FI3-1时期属河流相沉积,具“南曲北网”分布特征;在FI2-2时期,南部主要发育曲流河沉积,北部发育三角洲平原沉积,沉积水体北深南浅;到FI2-1时期,研究区主要发育三角洲平原沉积;FI1-3时期,研究区北部发育三角洲前缘沉积,南部发育三角洲平原沉积;FI1-2至FI1-1时期,研究区主要发育三角洲前缘沉积。
[Abstract]:The study area of Aonan is located in the south of Daqing Placanticline in the north of Songliao Basin. It is located in four secondary structural zones, namely, Daqing Placanticline, Sanzhao Sag and Chaoyang Gou terrace. The source bed in this area is Qingshankou formation, and the target layer is Fuyu oil layer.Many researches have been carried out in the south of the Plaganticline, but the study on the whole Aonan area is still lack of understanding, mainly because the division of sedimentary units and the characteristics of sedimentary microfacies distribution need to be further clarified.In view of the rich oil and gas resources in Aonan area, but lack of systematic understanding of sedimentary microfacies, the study of high-resolution sequence stratigraphic division and correlation and sedimentary microfacies is carried out in this paper.It provides a basis for understanding the distribution and development of sedimentary facies in this area and provides a theoretical basis for further exploration and development of oil and gas resources.On the basis of investigation of previous research results, structural evolution characteristics and regional sedimentary background, Fuyu oil layers in the southern Aonan area of Daqing Changyuan in the north of Songliao Basin are taken as the research objects, combined with earthquakes, cores and logging.Under the guidance of high-resolution sequence stratigraphy, logging geology and sedimentology, the subdivision and correlation of Fuyu oil layers and the division of sedimentary microfacies in the study area are studied in detail.The distribution characteristics and evolution law of sedimentary microfacies in Fuyu reservoir are clarified.Based on the high resolution sequence, the well earthquakes and subdivision correlation methods of Fuyu reservoir are established, and the method of sedimentary microfacies research is perfected. In the study, 315 wells in six seismic work areas have been stratified and correlated.The whole closed and unified correlation and stratification of Fuyu oil layers from 5 to 12 points in the southern area of Changyuan has been realized, which lays a foundation for subdividing sedimentary microfacies and understanding the law of microfacies evolution.The following conclusions are obtained: (1) there are five intermediate cycle interfaces developed in the study area, in which the bottom of FI1 / FI3 / FII2 is sedimentary transfer surface, the bottom of seismic profile is continuous, the bottom of weak amplitude FI2 / FII1 is a lake flooding surface, the seismic profile is continuous and medium amplitude, and there are 12 ultra-short term cyclic interfaces.There are 19 kinds of sedimentary microfacies in meandering river, delta front and delta plain, and massive (silty) mudstone with calcium (argillaceous) siltstone.In the FII2 and FII1 periods, the northwestern and northeast provenances mainly developed from FI3 to FI1, and the southwestern provenances developed gradually, and extended northward with a stronger momentum.The southeastern provenance developed in the period of FI 1.In general, the western part of southern Portugal and the Xinzhao area are mainly from the northwest; the eastern part of southern Portugal and the northern part of the blank area are mainly from the northeast; most of the Ao9, Maoxing, and Pu351 working areas are mainly from the southwest and the south.The southeastern part of Aonan is controlled by the south and southeast provenances.The study area belongs to multi-provenance sedimentary system, with two major provenances, southwest and northwest, and southeast and northeast provenances, with a trend of "strong south, strong north and weak".) the study area fi and FII belong to the whole continuous water entering sedimentary body and experience rivers from bottom to top.The sedimentary evolution process of delta front subfacies. FII2-2 to FI3-1 belongs to fluvial facies and has the characteristics of "Nanqu North net" distribution. In FI2-2 period, meandering river deposits are mainly developed in the south and delta plain deposits are developed in the north.During the period of FI2-1, the study area mainly developed delta plain sedimentary FI1-3 period, the northern part of the study area developed delta front sedimentation, and the south developed delta plain sediment from FI1-2 to FI1-1 period.The delta front deposits are mainly developed in the study area.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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