断裂输导油气运移形式分布区预测方法及其应用

为研究断裂在油气成藏与分布中的作用，在断裂输导油气运移形式划分的基础上，对断裂输导油气运移形式所需条件和分布区预测方法进行了研究，结果表明:断裂输导油气运移形式不同，所需条件也不同，断裂垂向向上输导油气运移形式所需的条件主要是断裂位于成熟源岩区内，断裂垂向向下输导油气运移形式所需条件是断裂位于具有供油气能力的超压成熟源岩区内，断裂侧向连接输导油气运移形式所需条件是断裂位于盖层断接厚度大于和等于其油气侧向运移所需的最小断接厚度区内，断裂侧向变径输导油气运移形式所需条件是断裂位于盖层断接厚度小于其油气侧向运移所需的最小断接厚度区内。通过断裂分布区成熟烃源岩区或具有供油气能力的超压成熟源岩区叠合和油气侧向运移区、油气非侧向运移区及断裂分布区叠合，分别建立了断裂垂向向上、垂向向下和侧向连接、变径输导油气运移形式分布区的预测方法，并将其分别应用于渤海湾盆地冀中坳陷留楚地区东二、三段、松辽盆地三肇凹陷扶杨油层和渤海湾盆地冀中坳陷文安斜坡沙二段断裂输导油气运移不同形式分布区预测中，其预测结果与目前留楚地区东二、三段、三肇凹陷扶杨油层和文安斜坡沙一段和沙二段已发现油气分布相吻合，表明该方法用于断裂输导油气运移形式分布区预测是可行的。

A Method Forecasting Distribution Areas of Fault Transporting Oil-gas Migration and Its Application

To study the play of fault in oil-gas accumulation and distribution, based on the division of fault transporting oil and gas forms, the conditions required for fault transporting oil-gas and the method forecasting distribution are studied.The results show that the fault transporting oil-gas migration forms are different and the required conditions are also different.The conditions required for fault vertically transporting oil-gas upward is that the fault locates in the area where mature source rocks exist.The condition of fault vertically transporting oil-gas downward is the fault located in the maturation zone with ex-high pressure and supply oil ability.The condition of fault laterally transporting petroleum migration is that the fault locates in where cap rocks faulted-contact thickness is greater than or equal to the minimum faulted-contact thickness for oil-gas lateral migration.The condition of fault laterally diameter changing transporting petroleum migration is that the fault locates in the area that cap rocks faulted-contact thickness less than faulted-contact thickness for oil-gas lateral migration.By comparing the matured source rocks distribution or the matured source rocks distribution with anomaly high pressure and supply hydrocarbon ability, oil-gas lateral migration distribution, oil-gas non-lateral migration distribution and fault distribution, a prediction method of different fault transporting distribution area is established.Then it is applied into the study of predicting distribution areas of fault transporting oil-gas migration in Ed2,Ed3 Formation, Jizhong sag of Bohai bay basin, the Fuyang Reservoir in the Sanzhao Depression of Songliao basin, and Ed2 in Wenan slope of Baxian depression, Bohai bay basin.The prediction results are consistent with the discovered distribution of oil and gas, indicating that the prediction method of fault transporting oil and gas migration is feasible.