春风油田沙湾组储层沉积微相特征及非均质性研究

发布时间：2018-01-30 13:56

本文关键词： 准噶尔盆地沙湾组水下沉积储层非均质性　出处：《长江大学》2017年硕士论文　论文类型：学位论文

【摘要】：春风油田为胜利油田于2011年在准噶尔盆地车排子地区新近系沙湾组取得的重大勘探成果,由于该油田勘探开发历史短、程度较低,导致沙湾组砂层组界限不明确,构造特征有待进一步落实;沉积类型不清楚,缺乏针对沉积微相的系统研究;储层物性纵横向变化快,非均质性较强;油藏类型及分布多样,成藏主控因素不明确。以上这些问题严重制约着油田下部勘探开发的部署。本文在前人研究的基础上,综合利用岩心、测井、地震及分析化验等资料,重新落实了沙湾组的砂层组界限,校正了原有的构造特征,明确了沉积微相类型及其分布,定量表征了储层非均质性,阐明了原油成藏的主控因素。通过本次研究共取得了以下认识:(1)沙湾组沉积时研究区整体为一北西高、东南低的单斜,中部存在一条进南北向带状展布的古隆起。(2)岩石的岩性、颜色、沉积构造、微量元素及地震同相轴的稳定性均表明沙湾组一段1砂组为典型的水下沉积,具有双物源交汇的沉积特征,共划分出2种沉积环境下的6种沉积微相,并刻画了其分布特征,明确了滩坝沉积的范围。(3)将岩心上的旋回特征标定在测井上,刻画了1砂组内部沉积的4个次级旋回,明确了自下而上各旋回内砂体的厚度及平面分布范围逐渐变小,类似于水进环境下的沉积,但是砂体的物性变化与旋回性耦合较差。(4)储层的微观特征显示储层钙质胶结强烈,初级空间主要为残余粒间孔,吼道的连通性较好。(5)研究区西部、西北部与中部储层非均质性强烈,而造成这种现象是构造、沉积与成岩三因素的共同影响,古隆起区、水动力变化较强的扇三角洲前缘水下分流河道以及钙质胶结强烈的地区储层非均质性强烈。
[Abstract]:Chunfeng Oilfield is a major exploration achievement of Shengli Oilfield in 2011 in Chepaizi area, Junggar Basin. Because of its short history of exploration and development, its degree is low. As a result, the boundary of sand formation in Shawan formation is not clear, and the structural characteristics need to be further implemented. The type of sedimentary is not clear and there is no systematic research on sedimentary microfacies. The reservoir physical properties change rapidly in the vertical and horizontal directions, and the heterogeneity is strong; The reservoir types and distribution are various, and the main controlling factors of reservoir formation are not clear. These problems seriously restrict the deployment of exploration and development in the lower part of the oilfield. Based on the previous studies, this paper comprehensively utilizes core and logging. The seismic and analytical data re-implement the sand formation boundary of Shawan formation, correct the original structural characteristics, define the type and distribution of sedimentary microfacies, and quantitatively characterize the reservoir heterogeneity. The main controlling factors of crude oil accumulation are clarified. Through this study, we have obtained the following understanding: 1) the sedimentary area of Shawan formation is a monoclinic with high north and west and low southeast. The lithology, color, sedimentary structure, trace elements and the stability of seismic cofacies axis of a paleouplift in the middle of Shawan formation indicate that the first member of Shawan formation is a typical underwater deposit. There are six sedimentary microfacies in two sedimentary environments and their distribution characteristics are described. The range of beach and dam sedimentation is defined. (3) the cyclic characteristics of the core are calibrated on the log, and the four secondary cycles of the internal deposition of the sand group 1 are described. It is clear that the thickness and plane distribution range of sand bodies in each cycle from bottom to top gradually become smaller, which is similar to the deposition in the environment of water entry. However, the microcosmic characteristics of sand bodies with poor coupling between physical properties and cyclicity show that the calcareous cementation of reservoirs is strong, the primary space is mainly residual intergranular pores, and the connectivity of the roar channel is better in the western part of the study area. The heterogeneity of the reservoir in the northwest and central regions is very strong, and this phenomenon is caused by the combined influence of three factors: structure, sedimentation and diagenesis, and the paleouplift area. The strong hydrodynamic variation of fan delta front underwater distributary channel and the strong calcareous cementation area reservoir heterogeneity is strong.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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