三塘湖盆地裂缝油藏非均质特征及成藏探讨

PROBE OF THE HETEROGENEITY BEHAVIOR AND THE FORMATION OF FRACTURED RESERVOIRS IN SANTANGHU BASIN

三塘湖盆地马朗凹陷上二叠统芦草沟组油藏多为"自生自储"裂缝型油藏,油藏样品的实验分析揭示了油藏宏观、微观两种尺度上的"有机质"非均质性表现;通过对油藏非均质性表现的成因分析,认为该类裂缝型油藏的有效油气储存空间主要是各级裂缝及毗邻基质孔隙;结合油藏特殊构造、沉积、成岩演化及烃源岩生烃演化等地质条件,探讨了该类"自生自储"裂缝油藏的油气聚集、成藏机制—"源内排烃"模式。

Organic matter heterogeneity was counted and studied for the fractured 'in situ reservoir' samples of upper Permian series in Malang sag Santanghu basin. With an eye to reservoir property, this paper reckoned that distinction cranny and adjacent pore are the valid storing space. Furthermore, according to the special sediment, diagenesis and structural evolution geology conditions of this fractured 'in situ reservoir', the paper also discussed the unique process of hydrocarbon generation, hydrocarbon venting, oil & gas migration and accumulation, i.e. the mode of oil & gas accumulation to form this kind of reservoir, the 'in situ venting' mode.