Quantitative Characterization of Reservoir Architecture of Meandering-River Deposits in Sparse Well Blocks: A Case Study of Chunguang Oilfield, Junggar Basin

doi:10.7657/XJPG20200203

Abstract

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

CLC Number:

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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