Hydrocarbon accumulation process in the Structure Y of Xihu Sag, East China Sea Shelf Basin and its implications for feature exploration
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摘要:
为了给Y构造下一步评价决策提供成藏支撑，打破勘探瓶颈，本文利用已钻井油气分布特征，综合平衡剖面、多指标油气源综合对比、流体包裹体、盆地模拟等技术研究了Y构造成藏过程。结果表明：Y构造23 Ma—现今共经历3期成藏，最终导致花港组下段聚集规模最大，中间的花港组上段为“过路成藏”，而龙井组以上油气藏小而散；“北强南弱”的挤压机制控制了油气“北富南贫”的总体格局；龙井运动形成的横张断层是控制花港组上段及以上油气纵向分布格局的关键；第一个成藏期内构造中北部花港组下段发育古油藏的局部构造是寻找甜点的有利方向。
Abstract:In order to support the next cycle of hydrocarbon resource evaluation and decision making process for the structure Y in the East China Sea Shelf Basin so as to break the bottleneck of future exploration, the hydrocarbon accumulation process of the structure Y was studied by means of balanced sections, multi-index comprehensive correlation of oil and gas sources, fluid inclusions and basin simulation. Results show that the structure has suffered three stages of hydrocarbon accumulation since 23 Ma, which eventually leads to the largest accumulation of hydrocarbon in the lower part of the Huagang Formation. The upper part of the Middle Huagang Formation only has hydrocarbon accumulated while it passes by the structure, and the reservoirs above the Longjing Formation are small and occasionally filled by oil and gas. The compression framework, which is “strong in north and weak in south”, controls the overall distribution pattern which is “rich in north and poor in south”; the transverse tensional fault formed by the Longjing movement is the key to control the vertical distribution pattern of oil and gas in the sequence of the upper Huagang Formation and above. Paleo-reservoirs in the lower part of Huagang Formation formed during the first reservoir forming period are the favorable direction for finding new sweet spots.
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表 1 Y构造综合油源对比
Table 1. Comprehensive oil source correlation for structure Y
井号 层位 样品类型 二萜含量 γ蜡烷指数 Ts/Tm C27-C28-C29分布型式 Pr/Ph Y4井 花港组 泥岩 低 0.34 1.22 “L”型 0.16 Y4井 花港组 油 高 0.45 0.55 反“L”型 4.7 Y4井 花港组 油 高 0.48 0.61 反“L”型 5.2 T气田 平湖组 油 高 0 0.37 反“L”型 5.5 T气田 平湖组 泥岩 高 0.17～0.38 0.33～0.43 反“L”型 3.02～6.29 
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