Analysis of differential accumulation between hanging and foot walls of Panyu 25 Fault in the western Baiyun Sub-sag
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摘要:
白云凹陷是珠江口盆地重要的油气产区，现对白云凹陷的研究主要集中在白云主洼，对白云西洼的油气勘探研究仍十分薄弱。近年来，对白云西洼加大了油气勘探力度，于番禺25断裂上下盘实施钻探，结果差异明显。为进一步探索白云西洼勘探潜力，本文通过对番禺25断裂上下盘开展差异成藏分析，探讨该地区的油气成藏规律。通过井上PVT样特征、MDT压力、天然气组分、碳同位素特征及成藏期古构造分析认为，番禺25断裂分割性强，油气成藏期上升盘与下降盘为2个独立的块体，表现为差异性成藏。烃类地化分析表明，上升盘凝析气来源于白云3次洼，下降盘的油气来源于临近的番禺25次洼。本文初步厘清了白云西洼的成藏规律，以期指导该地区的勘探部署：围绕白云3次洼优势运移路径开展天然气的勘探，围绕番禺25次洼近源开展原油的勘探；同时，也为其他地区断裂上下盘差异性成藏研究提供了有益借鉴。
Abstract:Baiyun Sag is an important oil and gas producing area in the Pearl River Mouth Basin. At present, research of Baiyun Sag is mainly in the main body of the sag, while it was understudied in the western Baiyun Sub-sag. In recent years, the oil and gas exploration in the subsag has been intensified, and the drilling has been carried out in the hanging wall and foot walls of Panyu 25 Fault. To further explore the exploration potential of the subsag, the differential accumulation between the hanging wall and foot wall was analyzed and the hydrocarbon accumulation rule in this area was discussed. Based on the PVT (pressure, volume, temperature) characteristics of samples, the MDT (mini drill stem testing) pressure analysis, natural gas composition, carbon isotope characteristics, and paleotectonic analysis of accumulation period, it is concluded that Panyu 25 fault has strong segmentation, and the hanging and foot walls are two independent blocks in the key accumulation period, showing different hydrocarbon accumulation. Geochemical analysis of hydrocarbons showed that the condensate gas in the up-thrown side came from Baiyun 3 Sub-sag, while the oil and gas in the down-thrown side originated from the adjacent Panyu 25 Sub-sag. The accumulation rule of the western Baiyun Sub-sag was clarified, which is beneficial to the exploration and deployment of this area. The natural gas exploration should be carried out around the dominant migration path of Baiyun 3 Sub-sag, and the crude oil exploration should also be conducted around the proximate source of Panyu 25 Sub-sag. This study provided a useful reference for the research on the differential accumulation of the hanging and foot walls of faults in other areas.
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表 1 白云西洼天然气组分及碳同位素
Table 1. Natural gas components and carbon isotopes in the western Baiyun Sub-sag
类型 深度/m 井名 C1/% C2/% C3/% 干燥系数/% 气油比 δ13C1/‰ δ13C2/‰ δ13C2/‰ PVT样品 3 070.5 PY25-A 57.91 14.14 11.82 63.94 1 846.9 −38.09 −29.66 −28.49 3 047.0 PY25-B 78.00 8.60 3.44 93.50 15 001.0 −36.60 −25.30 −25.80 3 072.5 PY25-B 80.70 7.30 2.71 94.80 14 652.0 −37.20 −25.30 −25.00 3 603.6 BY3-A 82.10 4.50 1.44 92.00 23 331.0 −31.70 −26.30 −24.56 
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