准噶尔盆地春光油田稀井区曲流河储集层构型定量表征

doi:10.7657/XJPG20200203

摘要/Abstract

摘要：

准噶尔盆地春光油田新近系沙湾组主力生产层段为曲流河沉积,古河道频繁迁移改道,形成了砂体横向尖灭快及纵向叠置复杂的空间分布特点,砂体内部结构特征刻画已成为精细挖潜亟需解决的问题,而井网密度小给储集层构型表征带来了较大难度。以地震和测井资料为基础,综合现代沉积特征,在“砂中找泥”思路指导下,利用地震沉积学地层切片技术对沙湾组曲流河储集层进行了多级次精细构型解剖。研究认为,废弃河道沉积、河道高程差异以及河道间细粒沉积可作为单一河道边界的典型区分标志。研究区内平面上共发育8个点坝,点坝砂体垂向上呈多期侧叠式分布,侧积层泥岩发育。各点坝内部侧积体的规模、倾向、倾角和水平间距经由现代沉积定量分析得以表征。研究区整体为多条同体不同期河道迁移改道叠加形成的大面积复合点坝沉积,为油田后期单砂体剩余油的进一步挖潜提供了理论依据,亦丰富了稀井区储集层构型及单砂体定量表征的研究。

关键词: 准噶尔盆地, 春光油田, 新近系, 沙湾组, 曲流河, 储集层构型, 定量表征, 地震沉积学

Abstract:

The sandstones from the Neogene Shawan formation in Chunguang oilfield were deposited in a meandering-river environment. Due to the frequent migration of the ancient river channel, the sandstones are characterized by rapid pinchout and complex vertical stacking, and the internal architecture characterization of the sandstones becomes a problem to be solved. But small well density brings difficulties to the characterization. Based on the analyses of stratigraphic slice, seismic and logging data and combined with the modern sedimentary characteristics, this paper conducts a detailed hierarchical anatomy of the meandering-river reservoir in Shawan formation. The research results show that abandoned river channel deposition, channel elevation difference and interchannel fine deposition can be taken as the typical markers to distinguish single channel boundary. There are 8 point bars developed in the study area, point bar sandbodies show a multi-stage lateral stacking vertically, and mudstone are developed in lateral accretion layers. The scale, trending, dip angle and horizontal spacing can be characterized through quantitative analysis of modern fluvial deposits. Large-scale composite point bars resulted from river channel migration and stacking formed in the study area. The understandings provide theoretical basis for further potential tapping of remaining oil in the single sandbodies at the late oilfield development stage, and enrich the studies on the quantitative characterization of reservoir architecture and single sandbody in the areas with small well density.

Key words: Junggar basin, Chunguang oilfield, Neogene, Shawan formation, meandering river, reservoir architecture, quantitative character-ization, seismic sedimentology

中图分类号:

樊晓伊, 薛国勤, 刘斌, 岳欣欣, 谢启. 准噶尔盆地春光油田稀井区曲流河储集层构型定量表征[J]. 新疆石油地质, 2020, 41(2): 147-157.

FAN Xiaoyi, XUE Guoqin, LIU Bin, YUE Xinxin, XIE Qi. Quantitative Characterization of Reservoir Architecture of Meandering-River Deposits in Sparse Well Blocks: A Case Study of Chunguang Oilfield, Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(2): 147-157.

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