A major discovery and the significance of new frontier exploration in the Huizhou sag, Pearl River Mouth Basin

doi:10.3969/j.issn.1672-7703.2020.04.003

Abstract

Abstract: The Huizhou sag in the Pearl River Mouth Basin is the ‘cradle’ of the petroleum industry in the eastern South China Sea, and also the breakthrough area for oil and gas discoveries in the middle-deep Paleogene in the eastern Pearl River Mouth Basin. For the past 10 years, however, exploration in the Huizhou sag has been trapped in a bottleneck. In order to discover new large-medium oil and gas fields, it is necessary to hold workshops and strengthen the re-evaluation work of petroleum geological conditions to bolster confidence in the exploration idea of “new achievements in mature areas”. Now, a new exploration concept is now proposed: “taking oil-rich sub-sags as a basis, focusing on Paleogene-buried hills, and expanding to new frontiers”. With increased research, new understandings of gas exploration in oil-rich sub-sags are emerging. In the Huizhou 26 sub-sag, mixed-type kerogens of lacustrine facies are characterized by “generation of both oil and gas, and rapid gas generation in the late stage” and offer great potential for natural gas resources. The “Paleogene-buried hills” trap group around the Huizhou 26 sub-sag has a hydrocarbon accumulation model of “strong near-source hydrocarbon supply and stereoscopic network migration”, making it the preferred zone for exploration transformation and new-field breakthroughs. The recent breakthrough discovery of a large-medium oil and gas field in the “Paleogene-buried hill” area of the Huizhou 26-6 structure—confirms this new target of gas exploration in high mature oil-rich sub-sag, opens a new chapter of “Paleogene-buried hill” exploration in the Huizhou sag, and expands the new exploration field of paleo-buried hills in the eastern Pearl River Mouth Basin.

Key words: Huizhou sag, large-medium oil and gas field, exploration transformation, gas exploration in oil-rich sub-sag, new frontier breakthrough in &ldquo, Paleogene-buried hills&rdquo

CLC Number:

Tian Lixin, Shi Hesheng, Liu Jie, Zhang Xiangtao, Liu Jun, Dai Yiding. A major discovery and the significance of new frontier exploration in the Huizhou sag, Pearl River Mouth Basin[J]. China Petroleum Exploration, 2020, 25(4): 22-30.

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