Source Rock Attribute, Oil Classification and Hydrocarbon Accumulation Main Control Factors of Xijiang Main Sag in Pearl River Mouth Basin

被引：1
|
作者：
Peng G. [1 ]
Zhang L. [1 ]
Xu X. [1 ]
Qiu X. [1 ]
He J. [1 ]
Liu Z. [2 ]
机构：
[1] Shenzhen Branch of CNOOC, Shenzhen
[2] Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 06期
关键词：
hydrocarbon accumulation main control factor; oil classification and oil origin; Pearl River Mouth basin; petroleum geology; source rock; Xijiang main sag;
D O I：
10.3799/dqkx.2023.090
中图分类号：
学科分类号：
摘要：
Xijiang main sag located in the north of Xijiang sag in Zhu Ⅰ depression is characterized by relatively lower paleo-geothermal gradient, thick mudstones in Enping Formation and more magmatism, which resulted in complexity of source rock potential, oil types and oil source, hydrocarbon accumulation and main control factors. Based on the analysis of the organic geochemical characteristics and distributions of the source rocks, oil classification, oil source and oil distribution, the relationships between oil accumulation, magmatism and faults, distribution and potential of the source rocks, the rule of oil accumulation and the main controlling factors could be identified. There are two types of middle-deep lacustrine source rocks with different attributes: the Wenchang IV Formation and the Wenchang III Formation in the Xijiang main sag, which have been strongly transformed and have different hydrocarbon supply capabilities. Two different oil groups have been recognized in Xijiang main sag, which origined from different source rocks and their spatial distributions are different. Group I oil origin from the Wenchang IV Formation source rock, distributed in the rift sequence and depression sequence reservoirs, with long lateral migration distance. Group II oil origed in from the Wenchang III Formation, only distributed in the rift sequence and accumulated near the sag. Source rocks and faults are two main controlling factors of hydrocarbon accumulation in Xijiang main sag. The difference in attribute and volume of the two type source rocks control the oils’organic geochemical characteristics, the level of hydrocarbon accumulation and the migration distance. The NE trending faults control the development and distribution of source rocks due to the change of segmentation and time-sharing activity rate. The NWW-EW trending faults control the development of the Wenchang III Formation source rock, and both control the hydrocarbon accumulation in the rift sequence near the sag and in the depression sequence in the Xijiang middle low uplift far from the sag. The hydrocarbon accumulation pattern could be expressed as source rocks control response on oil accumulation direction, faults control response on reservoir layers, magmatism control response on oil enrichment. © 2023 China University of Geosciences. All rights reserved.
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页码：2361 / 2375
页数：14
相关论文
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