Enrichment Patterns and Main Controlling Factors of Source Rocks in the Permian Pingdiquan Formation, Eastern Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2022.196

Abstract

Abstract:

To determine whether effective source rocks are developed in the eastern Junggar Basin is crucial to oil and gas exploration in the Junggar Basin. Through geochemical analysis, ΔlgR method and integration of logging and seismic data, we identified and evaluated the source rocks of the Permian Pingdiquan Formation in the eastern Junggar Basin (Zhundong), and delineated the source rock spatial distribution by combining with seismic facies. The results show that the source rocks of the Pingdiquan Formation are mainly dark mudstone, and the abundance of organic matter is medium to high. The mud and shale of semi-deep lacustrine facies is the high-quality source rocks, which is enriched in the Pingdiquan Formation (2^nd member). On the plane, the source rocks are concentrated in the Kalamali piedmont zone in the north and the Bogda piedmont zone in the south, separated by the Qitai uplift. The source rock abundance in the southern and northern zones is divided by secondary sags, characterized by high TOC (>1.5%) in the west and low TOC (0.5% to 1.5%) in the east. The zoning and block characteristics are controlled by two systems and fault activities of the North Tianshan and East Junggar island arcs. Paleosalinity analysis of lake water during the depositional period shows that the northern belt is a small divided depression, while the southern belt is a connected rift basin. The results suggest that oil and gas exploration in the northern belt should be conducted from west to east, while in the southern belt should have equal importance from east to west.

Key words: logging prediction of organic carbon content, organic matter abundance, source rock, Pingdiquan Formation, eastern Junggar Basin

CLC Number:

TE122.1

FAN Yan, WANG Xulong, XIANG Caifu, WANG Qianjun, LIU Jia, LIAO Jiande, XU Huaimin. Enrichment Patterns and Main Controlling Factors of Source Rocks in the Permian Pingdiquan Formation, Eastern Junggar Basin[J]. Geoscience, 2022, 36(04): 1105-1117.

Figures/Tables 12

Fig.1 Tectonic divisions and Middle Permian sedimentary facies in the eastern Junggar Basin

Table 1 Source rock characteristics of the Pingdiquan Formation in the eastern Junggar Basin

区带		有机质丰度		有机质类型	有机质成熟度		暗色泥岩厚度
位置	凹陷	TOC/%	平均值/%	有机质类型	R_o/%或T_max/℃	平均值/%或℃	分布区间/m	平均值/m
克拉美丽山前带	帐北断褶带- 北三台凸起	0.1~71.4 (n=263)	4.0	Ⅰ-Ⅱ₂	0.6%~1.3% (n=15)	0.8%	10~230	200
	石钱滩	0.1~4.9 (n=18)	0.7	Ⅱ₁-Ⅲ	365~487 ℃ (n=18)	460.9 ℃	50~170	100
	露头剖面	0.1~3.6 (n=13)	0.9	/	420~523 ℃ (n=13)	472 ℃	/	/
博格达山前带	阜康	0.5~2.6 (n=16)	1.1	Ⅱ₁-Ⅲ	1.5% (n=2)	1.5%	50~200	150
	吉木萨尔	2.2~9.6^[28] (n=76)	6.7	Ⅰ-Ⅱ₂	0.5%~2.1%^[28] (n=35)	0.8%	50~170	100
	木垒北	0.1~1.7 (n=34)	0.8	Ⅰ-Ⅱ₁	0.8%~1.1% (n=9)	0.8%	50~250	150

Fig.2 Logging prediction model of organic matter abundance in the Pingdiquan Formation, eastern Junggar Basin

Fig.4 Schematic seismic facies prediction method for the spatial distribution of high abundance source rocks, eastern Junggar Basin

Fig.5 Source rock characteristics of the Pingdiquan Formation in the north-south section, eastern Junggar Basin

Fig.6 Source rock characteristics of the Pingdiquan Formation in Section AA1, eastern Junggar Basin

Fig.7 Source rock characteristics of the Pingdiquan Formation in Section BB1, eastern Junggar Basin

Fig.8 Intersection diagram of organic carbon content and hydrocarbon generation potential, and the contour map of TOC in the Pingdiquan Formation of different sags, eastern Junggar Basin

Fig.9 Isopach map of source rocks in the Pingdiquan Formation, eastern Junggar Basin

Fig.10 Sr/Ba contour map of source rocks in the Pingdiquan Formation, eastern Junggar Basin

Fig.11 V/Cr contour map of source rocks in the Pingdiquan Formation, eastern Junggar Basin

Fig.12 Maturity contour map of source rocks in the Pingdiquan Formation, eastern Junggar Basin

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