Characteristics and Genesis Mechanism of High-quality Clastic Reservoirs in Zhuanghai Area of Jiyang Depression

doi:10.3969/j.issn.1006-6535.2024.03.004

Abstract

Abstract: Oil and gas resources are rich in Zhuanghai Area of Jiyang Depression. The proven reserves are high in the Neocene and buried hill strata, while the degree of drilling and understanding of the Paleogen is low, and the characteristics of the Paleogen reservoirs and the genesis mechanism of high-quality reservoirs are poorly understood. For this reason, we have studied the petrological characteristics, type of diagenesis, spatial characteristics of clastic reservoirs and the controlling factors of high-quality reservoirs in the Lower Dongying Member-Shahejie Formation in Zhuanghai Area through the means of analysis such as cores, thin sections, scanning electron microscopy, etc. The results show that the clastic reservoirs of the Lower Dongying Member-Shahejie Formation in Zhuanghai Area have a small distribution range and thin thickness, and the reservoirs are dominated by sandstones deposited rapidly near sources with low rock maturity. The compaction is the main reason for destroying the pore space of the reservoirs. The cementation, mainly carbonate cementation, has caused further damage to the pore space. The dissolution of organic acid is an essential factor for forming secondary pore space and increasing pore space in the reservoir. The overall pore type is dominated by secondary pores and primary pores are only retained to a relatively high degree in the reservoirs of the Lower Dongying Member in the northwest source area, and the reservoir fractures are few. The high-quality reservoirs is mainly controlled by three conditions: sedimentary conditions, diagenetic modification, and fracture communication. The glutenite reservoirs are favorable exploration targets with high rock maturity, far from calcium sources, close to acid sources, and fracture communication. This study can provide the geological basis for the exploration and development of the Paleocene system in Zhuanghai Area.

Key words: diagenesis, clastic reservoir quality, reservoir genesis, subtle oil and gas reservoir, Zhuanghai Area, Jiyang Depression

CLC Number:

TE122.1

Wei Min, Yu Shina, Tong Huan, Wu Yanjia, Zhou Hongke, Shi Xiaoxiao, Guo Hougen. Characteristics and Genesis Mechanism of High-quality Clastic Reservoirs in Zhuanghai Area of Jiyang Depression[J]. Special Oil & Gas Reservoirs, 2024, 31(3): 27-36.

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