准噶尔盆地南缘四工河剖面中二叠统乌拉泊组辫状河三角洲沉积模式及沉积序列

发布时间：2018-10-31 20:32

【摘要】：辫状河三角洲砂体较为发育,物性良好,可作为重要的油气储层。因此,深入分析其沉积特征、建立沉积模式及序列对油气勘探具有重要的指导作用。通过对准噶尔盆地南缘四工河剖面乌拉泊组辫状河三角洲露头进行实测,对各沉积微相沉积特征、岩相及粒度特征进行分析,最终建立该区辫状河三角洲沉积模式及垂向沉积序列。研究表明:四工河剖面沉积主要以辫状河三角洲平原和前缘亚相为主,微相主要为平原分流河道、分流河道间、水下分流河道及河口坝等,辫状河三角洲前缘砂质较为发育,以水下分流河道砂体为主,粒度较细,分选、磨圆均较好,可作为油气良好的储层;岩相识别、划分表明,乌拉泊组辫状河三角洲共发育8种典型的岩相类型,识别出4种典型的岩相及微相组合;辫状河分流河道粒度曲线主要由跳跃总体与悬浮总体组成,且水下分流河道跳跃总体可分为2段,河口坝粒度曲线由多段组成,较为复杂;在对沉积特征、岩相、粒度等研究的基础上,最终建立乌拉泊组辫状河三角洲沉积模式,可为区内油气勘探提供一定的指导。
[Abstract]:The braided river delta sand body is relatively developed, and its physical properties are good, so it can be used as an important oil and gas reservoir. Therefore, the analysis of sedimentary characteristics and the establishment of sedimentary models and sequences play an important role in oil and gas exploration. By measuring the braided river delta outcrop of the Wulapo formation in the Sigonghe section of the southern margin of Junggar Basin, the sedimentary characteristics, lithofacies and granularity characteristics of each sedimentary microfacies are analyzed. Finally, the sedimentary model and vertical sedimentary sequence of braided river delta in this area were established. The results show that the deposition of Sigonghe section is mainly composed of braided delta plain and front subfacies, microfacies are mainly plain distributary channel, underwater distributary channel and estuarine dam, and the sand in front of braided river delta is relatively developed. The sand body of underwater distributary channel is the main body with fine granularity, fine sorting and good grinding circle, so it can be used as a good reservoir for oil and gas. The classification of lithofacies shows that there are 8 typical lithofacies types in the braided river delta of the Wulabo formation and 4 typical lithofacies and microfacies assemblages are identified. The particle size curve of braided river distributary channel is mainly composed of jump population and suspension population, and the underwater distributary channel can be divided into two sections, and the grain size curve of estuarine dam is composed of multiple sections, which is more complex. Based on the study of sedimentary characteristics, lithofacies and granularity, the braided river delta sedimentary model of the Wulapor formation is established, which can provide some guidance for oil and gas exploration in the region.
【作者单位】：中国地质大学(北京)能源学院;
【基金】：国家自然科学基金(编号:41472091) 国家“十三五”科技重大专项(编号:2017ZX05001-002)联合资助
【分类号】：P618.13

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