利用地震资料预测油源断裂有利输导油气部位

Prediction of favorable oil-gas transportation parts of oil-source faults on seismic data

油源断裂有利输导油气部位是指大量油气沿油源断裂向上运移的部位,主要受断裂不同部位活动特征、断面形态和砂体及裂缝发育特征的影响,能否准确地预测油源断裂输导油气有利部位,是含油气盆地"下生上储"式油气勘探的关键。为此,在油源断裂有利输导油气部位及影响因素研究的基础上,利用地震资料确定了断裂的"凸面脊"和转换带发育部位,定量预测了断裂不同部位的活动速率,并通过"凸面脊"、转换带和活动速率三者叠合,建立了一套利用地震资料预测油源断裂有利输导油气部位的方法。利用该方法对渤海湾盆地冀中坳陷廊固凹陷大柳泉地区旧州断裂的6条分支断裂的有利输导油气部位的预测结果表明:在分支断裂F1和F2上共发育4处有利输导油气部位,有利于下伏沙四段源岩生成的油气在沙三中下亚段运聚成藏,与已发现油气的成藏规律相符,说明利用文中方法预测油源断裂有利输导油气部位是可行的。

Prediction of favorable oil-gas transportation parts of oil-source faults is a key issue in the hydrocarbon exploration.Favorable oil-gas transportation parts were affected by many factors such as fault activity characteristics and development characteristics.Based on favorable oil-gas transportation parts and their influence factors,we first determine fault-plane ridges and transfer zones on seismic data,and predict quantitatively activity rates at different parts of faults.Then we superpose fault-plane ridges,transfer zones,and fault activity rates together to predict favorable oil-gas transportation parts.The proposed approach is applied to 6 faults in the Langgu Area,Jizhong Depression,Bohai Bay Basin.The results indicate that Faults F^1 and F^2 have 4 favorable oil-gas transportation parts,which has good coincidence with the discoveries.Our practice proves feasibility and effectiveness of the proposed approach.