方正断陷大罗密—兴旺地区古近系沉积特征研究

发布时间：2018-05-14 23:36

本文选题：方正断陷 + 大罗密-兴旺地区　；参考：《吉林大学》2015年硕士论文

【摘要】：方正断陷位于依-舒地堑中北段，为一个双断式断陷，被认为是中国东北部构造最为复杂的陆相断陷盆地，由于其地质条件复杂，大量油气资源尚待开发。大罗密-兴旺地区位于方正断陷东北部，近年来首次发现产量较高的工业油气流，在此之后开始深入探索该地区的生油气潜力。对该地区沉积相进行精细刻画、研究沉积相带展布规律及演化特征，将对研究区的油气勘探远景有着重要的现实意义。本文结合前人研究成果，综合应用钻井、测井、地震等资料，对研究区进行了区域地质研究、层序地层划分与对比、沉积相类型识别与划分以及沉积相分布特征研究。在区域地质研究方面，详细查明了方正断陷地层发育情况以及6个构造演化阶段；在地层划分与对比方面，对研究区进行了三级层序和体系域的划分，并分别对单井和连井剖面层序地层进行了详细的分析，建立了等时层序地层格架；在沉积相类型识别方面，识别出研究区发育扇三角洲、湖泊和湖底扇3种沉积相，进一步将这三种沉积相划分为8种沉积亚相和16种沉积微相类型；在沉积相分布特征研究方面，对研究区典型钻井进行了详细的沉积相分析，建立了连井沉积剖面，在此基础上进行了平面相分析，论述了沉积相平面展布特征及演化规律。新安村+乌云组整体构成一个由细到粗的沉积旋回，早期湖泊相沉积发育，形成了该组下部的暗色泥岩，晚期物源充足，发育规模较大的扇三角洲沉积，湖泊区部分区域发育湖底扇沉积，二者对储集岩的分布具有一定的贡献作用，总体来说该时期构成了水系发育的扇三角洲-滨浅湖-半深湖沉积体系。宝泉岭组一段和宝泉岭组二段时期研究区经历了水体逐渐加深的过程，宝泉岭组一段区内发育小范围扇三角洲，到宝泉岭组二段时期达到最大湖泛面，湖相沉积面积扩大，形成大范围湖相暗色泥岩，扇三角洲面积减小，宝泉岭组二段后期湖盆有所回缩，物源供给能力增强。宝泉岭组三段时期断陷进入萎缩期，水体变浅。
[Abstract]:Fangzheng rift is located in the north section of the middle section of the Yi Shu graben and is a double faulted fault depression. It is considered to be the most complex continental fault basin in northeastern China. Due to its complex geological conditions, a large amount of oil and gas resources are still to be developed. The great ROMI Xing Wang area is located in the northeast of Fangzheng fault depression. After this, the potential of oil and gas in this area has been deeply explored. The fine depiction of the sedimentary facies in this area and the study of the distribution and evolution characteristics of the sedimentary facies will be of great practical significance to the prospect of oil and gas exploration in the study area.
In this paper, combined with the previous research results and comprehensive application of drilling, logging, and earthquake data, regional geological research, sequence stratigraphic division and comparison, identification and division of sedimentary facies types and the distribution characteristics of sedimentary facies are carried out in the study area. In the area of regional geological research, the development of the fangzheng fault formation and 6 tectonic performances have been found out in detail. In the stratigraphic division and the stratigraphic division and contrast, the three sequence and the system domain are divided in the study area, and the sequence stratigraphy of the single well and the even well section is analyzed in detail, and the isochronous sequence stratigraphic framework is established. In the aspect of the type identification of the sedimentary facies, the deltaic fan delta, the lake and the lake bottom fan are identified. The three sedimentary facies are further divided into 8 sedimentary subfacies and 16 types of sedimentary microfacies. In the study of the distribution characteristics of the sedimentary facies, the detailed sedimentary facies analysis is carried out for the typical drilling in the study area, and the continuous well sedimentary section is established. On this basis, the plane phase analysis is carried out, and the characteristics and evolution of the sedimentary facies are discussed. Law.
The Xin'an village + Wu Yun formation consists of a fine to coarse sedimentary cycle, the early lake facies deposits and development, the formation of the dark mudstone in the lower part of the group, the abundant source in the late stage, the large fan delta deposit, and the lake bottom fan deposits in some regions of the lake area. The two groups have a certain contribution to the distribution of the reservoir rock. The period of this period constitutes the fan delta, the shallow lake and the half deep lake sedimentary system developed in the water system. The two section of the Bao Ching formation and the Bao Quan Ling formation has experienced the gradual deepening of the water body. The small range fan delta developed in the first section of the Bao Ching formation, to the two section of the Bao Quan formation to the maximum lake surface, and the area of the lacustrine sedimentary area expanded. The area of lacustrine dark mudstone is large and the area of fan delta decreases. In the late two stages of the Bao Quan formation, the lake basin is retracted and the supply capacity of the source is increased. In the three stages of the Bao Quan formation, the depression entered the atrophy period and the water body became shallow.

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

【参考文献】