油源断裂向上输导油气最大距离分布部位预测方法及其应用

为了研究含油气盆地油源断裂处不同层位油气分布规律，在油源断裂向上输导油气最大距离及其分布部位研究的基础上，通过源岩排烃分布区和输导断裂输导部位，确定油源断裂输导油气部位；通过区域性泥岩盖层古断接厚度与断裂在区域性泥岩盖层内分段生长上下连接所需的最大断接厚度，确定穿过和距源最近区域性泥岩盖层不封闭和封闭部位，建立了一套油源断裂向上输导油气最大距离分布部位的预测方法，并利用其预测了渤海湾盆地歧口凹陷港东断裂向上输导沙三段源岩生成油气最大距离分布部位。结果表明：港东断裂向上输导沙三段源岩生成油气最大距离为沙一中亚段区域性泥岩盖层，主要分布在其东部和西部；港东断裂向上输导沙三段源岩生成油气最大距离为东二段区域性泥岩盖层，主要分布在其中西部局部；港东断裂向上输导沙三段源岩生成油气最大距离为明化镇组区域性泥岩盖层，主要分布在其中东部，分别为下伏沙三段源岩生成油气向沙一下亚段、东三段和馆陶组的运聚空间，与港东断裂处沙一下亚段、东三段和馆陶组目前已发现油气分布相吻合，表明该方法用于预测油源断裂向上输导油气最大距离分布部位是可行的。

Prediction method and application of maximum distance distribution position of oil and gas transported upward by oil source fault

In order to study the distribution patterns of oil and gas at different layers of oil source faults in oil and gas bearing basins, based on the study of the maximum distance and distribution location of oil and gas transported upward by oil source faults, the oil and gas transmission location of oil source faults are determined through the distribution area of source rock hydrocarbon expulsion and the transmission location of transmission faults. By comparing the ancient fault thickness of regional mudstone caprocks with the maximum fault thickness required for segmented growth and connection of faults within the regional mudstone caprocks, the unclosed and enclosed parts of the regional mudstone caprocks that pass through and are closest to the source are determined. The two are combined to establish a prediction method for the maximum distance distribution of oil and gas transported by oil source faults. The maximum distance distribution of oil and gas generated from source rocks in the third member of Shahejie Formation(Es3)transported upward by Gangdong fault in Qikou Sag, and Bohai Bay Basin is predicted. The results indicate that the maximum distance for oil and gas generation from the source rocks of Es3 transported upwards by the Gangdong fault is the regional mudstone cap rock of the middle sub-member of the first member of Shahejie Formation (Es1z), mainly distributed in its eastern and western regions. The maximum distance for oil and gas generation from the source rock of Es 3 transported upwards by the Gangdong Fault is the regional mudstone cap rock of the second member of the Dongying Formation (Ed2), which is only distributed in the western part of it. The maximum distance for the upward migration of oil and gas generated by the source rocks of Es3 in the Gangdong Fault is the regional mudstone cap rock of the Minghuazhen Formation(Nm), mainly distributed in the eastern part, which is the migration and accumulation space for oil and gas generated by the source rocks of the lower sub-member of the first member of Shahejie Formation (Es1x), the third member of the Dongying Formation (Ed2), and the Guantao Formation (Ng). This is consistent with the current discovered oil and gas distribution in Es1x, Ed3 and Ng at the Gangdong fault. It indicates that the method is feasible for predicting the maximum distance distribution of oil and gas upward transport through oil and gas faults.