PETROLEUM GEOLOGICAL CHARACTERISTICS AND EXPLORATION DIRECTIONS OF DEEP WATER BASINS IN SOUTH CHINA SEA
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摘要:
在深入调研南海深水盆地油气地质条件的基础上，系统分析了油气分布规律和成藏主控因素，明确了油气资源潜力和有利勘探方向，旨在为南海深水油气勘探决策提供科学依据。研究结果表明：南海深水盆地发育在非典型边缘海大陆边缘，其石油地质条件具有特殊性，油气分布特征存在显著的南北差异。其中，南海北部深水的珠江口盆地和琼东南盆地，以构造圈闭型油气藏为主；南海中南部深水的曾母盆地南部和文莱-沙巴盆地，主要为构造圈闭型油气藏，曾母盆地北部以岩性油气藏（生物礁滩型油气藏）为主，万安盆地主要为构造圈闭型和基岩潜山型油气藏。南海北部深水盆地和中南部深水盆地的烃源岩、储盖和圈闭等油气地质特征表明，南海深水盆地具有巨大的油气勘探潜力。南海深水的有利勘探方向为：①琼东南盆地乐东-陵水凹陷的中央峡谷、陵南斜坡带，松南-宝岛凹陷的反转构造带，宝岛凹陷北坡海底扇，长昌凹陷的环A洼圈闭带（海底扇）；珠江口盆地白云凹陷的主洼深水扇、主洼两翼、西南断阶带，荔湾凹陷的深水扇。②南海中南部深水盆地的文莱-沙巴、曾母和万安盆地。
Abstract:Based on the in-depth investigation of petroleum geological conditions, we discussed in this paper the distribution pattern of oil and gas in the South China Sea deep-water basins and their controlling factors on reservoir formation, petroleum resources potentials and favorable exploration directions, so as to provide a scientific basis for decision-making in deep-water oil and gas exploration of the region. The results show that the deep-water basins in the South China Sea are formed on the typical continental margin of a marginal sea, with specialpetroleum geological conditions and significant north-south differences. The deep-water Pearl River Mouth Basin and Qiongdongnan Basin in the northern South China Sea are dominated by structural traps, the southern Zengmu Basin and Brunei Shaba Basin in the south dominated by structural traps; the northern Zengmu Basin dominated by lithologic reservoirs (reef bank type reservoirs); while the Wan’an Basin by structural trap and buried hill types of reservoirs. The petroleum geological characteristics of the deep-water basins in the northern South China Sea and the South Central South China Sea suggest that the deep-water basins in the South China Sea have greatpotential of oil and gas accumulation. The favorable exploration directions include: ① the Central Canyon and Lingnan Slope of Ledong-Lingshui Depression of the Qiongdongnan Basin, the reversed structural zone of Songnan-Baodao Depression, the submarine fan on the north slope of Baodao Depression, the trap belt around A sub-depression (submarine fan) of Changchang Depression, the deep water fan and the two wings of main depressions, and southwest fault step belt of the Baiyun Depression in Pearl River Mouth Basin, and the deep water fan in Liwan Depression. ② Brunei-Sabah, Zengmu and Wan’an basins are favorable exploration directions in the Southern Central of South China Sea.
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