A Study on Single Sand Body Based on Sedimentary Time Unit

doi:10.11885/j.issn.1674-5086.2020.09.17.02

Abstract

Abstract: The braided river delta front subfacies of Ⅶ sand group in the hanging wall of fault N₁—N₂¹ reservoir of Gasikule Oilfield was chosen as the object of study. The division of sedimentary time unit, the meaning and identification mark of single sand body, and configuration mode are discussed. Based on the natural gamma half amplitude point, the subzone can be divided into reservoir sedimentary time unit, interlayer sedimentary time unit, and the regional interlayer within the reservoir sedimentary time unit. The sedimentary time units of the regional interlayer and interlayer are mainly composed of mudstone, and the sedimentary time unit of the reservoir majorly consists of laterally-connected sandstone and mudstone. The complete concept of a single sand body is first proposed based on the forgoing ideas. The single sand body, which is formed under the control of sedimentation, structure, and diagenesis, is supposed to be an independent unit surrounded by an impermeable barrier layer in three-dimensional space. The identification marks of a single sand body are clarified, and the basic configuration mode of a single sand body is also summarized in this study. The author has successfully applied this method to subzone Ⅶ—5 in the Gasikule Oilfield. The two single sand bodies of the subzone level are further divided into 17 single sand bodies of sedimentary time unit level, which greatly improves the research accuracy of a single sand body.

Key words: Gasikule Oilfield, braided river delta front, sedimentary time unit, single sand body, configuration mode

CLC Number:

TE122

SHENG Jun, MOU Zhonghai, PU Yong, WU Tao, WANG Junlin. A Study on Single Sand Body Based on Sedimentary Time Unit[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(5): 1-13.

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