关键词: 油源断裂, 油气运聚空间, 分布部位, 预测方法, 歧口凹陷

Abstract: In order to study the distribution law of oil and gas near oil source faults in petroliferous basins, based on the study of spatial distribution of oil and gas migration and accumulation in different layers controlled by oil source faults, through the oil source faults transporting favorable positions of oil and gas in the lower reservoir, the spatial distribution position of oil and gas migration and accumulation between source rock and lower cap rock controlled by oil source faults is determined. The spatial distribution of hydrocarbon migration and accumulation between source rock and middle cap rock controlled by oil source faults is determined through the oil source faults transporting favorable parts of oil and gas in the lower reservoir and the leakage parts of regional mudstone caprock in the lower reservoir. The spatial distribution of oil and gas migration and accumulation from the source rock to the upper cap rock controlled by oil source faults is determined by the oil source fault in the favorable part of oil and gas transmission in the lower reservoir and the leakage parts of the lower and central regional mudstone cap rocks. A prediction methods of hydrocarbon migration and accumulation space distribution positions in different layers controlled by oil source faults was established by the combination of the three. The results show that, except the western end, the rest parts are the spatial distribution parts of oil and gas migration and accumulation from the source rock of the Es3 Formation to the caprock of the Es1z Formation controlled by Gangdong fault. The spatial distribution of hydrocarbon migration and accumulation in the source rock of the Es3 Formation and the caprock of the Ed2 Formation, which are controlled by Gangdong fault, are distributed in its middle part, the former is slightly larger than the latter. These position are respectively beneficial to oil and gas generated by the source rock of the Es3 Formation migration and accumulation to the reservoirs under the regional mudstone caprock of the Es1z Formation, the Ed2 Formation and Nm Formation near Gangdong fault, it is consistent with the oil and gas distribution found in the reservoirs under the regional mudstone caprock of the Es1z Formation, the Ed2 Formation and Nm Formation near Gangdong fault at present, indicating that the method is feasible to predict the hydrocarbon migration and accumulation space distribution positions in different layers controlled by oil source faults.

Key words: oil source fault, hydrocarbon migration and accumulation space, distribution position, prediction method；Qikou depression