Microfacies analysis of sand formation in Shengyi District, Shengtuo Oilfield, Dongying Sag

doi:10.13745/j.esf.sf.2022.12.55

Abstract

Abstract:

The Shengyi District is located in the western Shengtuo Oilfield, where rich oil/gas deposits are found in reverse drag anticline traps formed under the control of the Shengbei Fault. In this study, sedimentary microfacies of the 1st sand group, 2nd member, Shahejie Formation (or ‘Sha’er 1 sand formation’, for short), Shengyi District, was investigated through core analysis, grain size analysis, and sedimentary facies analysis. The sand formation is mainly made up of shallow lake beach-bar deposits, with five sedimentary microfacies: main bar; bar edge; beach ridge; beach sheet; and inter-beach depression. Facies characteristics and depositional environments of the Sha’er 1 sand formation, revealed by facies analysis on typical cores from single and continuous wells, show that the deposition of the sand formation is mainly controlled by provenance, landform, wind field, and water depth. This research can provide strong technical support for sustainable and stable oil field development in the later stage.

Key words: beach bar, main bar, storm, wave, bar edge

CLC Number:

P624
TE343

CUI Wenfu, SHEN Zhihan, JIANG Zaixing, HE Lirong, WANG Cheng, ZHANG Jiazhi, LIU Tong. Microfacies analysis of sand formation in Shengyi District, Shengtuo Oilfield, Dongying Sag[J]. Earth Science Frontiers, 2023, 30(3): 452-464.

Figures/Tables 17

Fig.1 Sketch map of the structural location of the first block of Shengtuo Oilfield

Table 1 Comparison of different classification schemes for beach-bar microfacies

分类方案	滩坝微相分类
曾发富等^[6]	滩主体、滩边缘、滩间、坝主体、坝侧缘、坝间
蒋解梅等^[7]	滩坝主体、滩坝后缘、滩坝前缘、坝后湖湾、滨湖沉积
操应长等^[8]、王永诗等^[9]	坝主体、坝侧缘、滩脊、滩席、滩间湾
本文划分	坝主体、坝侧缘、滩脊、滩席、滩间洼地

Fig.2 Vertical description of cores from Well ST1-3-XJ142, Sha’er 1 sand formation, Shengyi District

Fig.3 Drill cores from different wells showing sedimentary microfacies of the main bar

Fig.4 Drill cores from different wells showing sedimentary microfacies of bar edge

Fig.5 Sedimentary characteristics of beach sands

Fig.6 Drill core showing characteristics of inter-beach depression in the sand formation

Fig.7 Particle size distribution in core sample from well ST1-3-XJ142

Fig.8 General features of logging curves for beach/bar sediments

Fig.9 Logging facies characteristics of beach-bar sedimentary microfacies types

Fig.10 Seismic reflection profile showing sedimentary characteristics of bar sands (x=1231)

Fig.11 Seismic reflection profile showing sedimentary characteristics of bar sands (x=1281)

Fig.12 Parasequence division of Well ST1-3-XJ142

Fig.13 Profile of sedimentary facies (Wells ST1-2-59 to ST1-2-153)

Fig.14 Profile of sedimentary facies (Wells ST1-0-88 to ST1-5-9)

Fig.15 Planar distribution of sedimentary microfacies in parasequences 1-5 of the sand formation

Fig.16 Depositional environments for the Sha’er 1 sand formation, Shengyi District

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