Breakthrough and significance of deep-water Paleogene exploration in Kaiping sag, Pearl River Mouth Basin

被引：0

作者：

Gao Y. ^{[1
]}

Peng G. ^{[2
]}

Chen Z. ^{[2
]}

Jiang D. ^{[2
]}

Ma N. ^{[2
]}

Li X. ^{[2
]}

Lü H. ^{[2
]}

Gao Z. ^{[2
]}

机构：

[1] Exploration and Development Department, CNOOC China Limited, Beijing

[2] Shenzhen Branch, CNOOC China Limited, Shenzhen, Guangdong

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2023年 / 44卷 / 07期

关键词：

accumulation mode; Kaiping sag; lacustrine source; light oil; Pearl River Mouth Basin; source-fault-reservoir;

D O I：

10.7623/syxb202307001

中图分类号：

学科分类号：

摘要：

After nearly 40 years of exploration in Kaiping sag of Pearl River Mouth Basin, a medium to large light oil field has been discovered in deep-water Paleogene strata of Kaiping11-4 structure. To further guide oil-gas exploration in Kaiping sag, the paper deeply investigates the petroleum geological conditions such as hydrocarbon sources, reservoirs, traps, preservation and migration conditions in Kaiping11-4 structure, and summarizes the oil and gas accumulation mode. The geological structure of Kaiping sag is a detachment-type compound half-graben with faults in the north and overlaps in the south. In Kaiping sag, Wenchang Formation develops high quality semi-deep to deep lacustrine source rocks with great hydrocarbon generation potential, and the shallow-water braided delta front deposits of Enping Formation develop a favorable reservoir-cap assemblage. The traps formed under the early tectonic activities are various, including faulted block, faulted anticline and plunging anticline, while the weak tectonic activity in the late period is conducive to oil and gas preservation. The inheritance faults that cut through the source rocks provide vertical migration channels so that oil and gas can be transported through the "source-fault-reservoir" system. The reservoirs in Kaiping11-4 structure have undergone multi-phase continuous charging since 17 Ma, presenting a hydrocarbon accumulation mode with the characteristics of "hydrocarbon supplying from high-quality lacustrine sources, strongly charging through near-source faults, and enriching in multiple stages and levels". The discovery of medium to large light oil field in Kaiping11-4 structure is not only a breakthrough of the new area exploration in Kaiping sag, but also a breakthrough of the Paleogene crude oil exploration in the eastern deep-water area of the South China Sea. It shows that the deep-water area of Pearl River Mouth Basin has a broad prospect for oil and gas exploration, and is of great significance to the exploration of petroliferous basins in the northern deep-water area of the South China Sea. © 2023 Science Press. All rights reserved.

引用

页码：1029 / 1040

页数：11

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