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为了有效降低地震解释中的不确定性,提出综合应用三维地震资料、地震相干切片、小层对比和井资料校正断裂解释的不确定性以及断层位置和组合方式正确性的一种方法.首先通过地震“十字”剖面和相干切片,落实地震断裂存在的真实性及预测亚地震小断层密度,通过垂直地震分辨率与地震断层末端点位移梯度比来预测亚地震断层尾部长度;其次以小层分层数据为基础,应用正断层钻井校正模式校正断层的位置.然后,基于断层面断距等值线确定出分段生长断裂,应用断层分段生长连接标准厘定分段生长断裂处于“硬连接”阶段还是“软连接”阶段(侧列叠覆).研究结果表明:断层质量校正有利于降低油气田勘探开发的风险性:1)亚地震断层尾部长度预测可能导致经济与亚经济前景资源的差异;2)断层位置校正是落实断层与井位配置关系的基础,杏树岗区块X9-4-31井注水受效验证了断层位置校正的可靠性;3)经证实太北开发区f074断裂是由2条侧列叠覆断层组成,明显控制着断圈类型划分以及封闭性定量评价;4)目前普遍应用泥岩涂抹系数(SSF)定量评价断层垂向分段生长,临界SSF值为5~8,低于临界值,形成典型泥岩涂抹封闭,若超过临界值,则形成贯通性断层,导致油气侧向渗漏或跨层聚集.
In order to effectively reduce the uncertainty in seismic interpretation, a method of comprehensively applying the three-dimensional seismic data, seismic coherence slice, small-layer contrast and well data to correct the uncertainty of fracture interpretation and the correctness of fault location and combination is proposed. Firstly, Earthquake “cross” section and coherence slice, the authenticity of the existence of the earthquake fault and the prediction of the small fault density in the sub-earthquake are fulfilled. The tail length of the sub-earthquake fault is predicted by the ratio of the vertical seismic resolution to the displacement of the end of the earthquake fault. Secondly, Based on the stratified layer data, the normal fault drilling correction mode is used to correct the position of the fault.Secondly, based on the fault contour contour of the fault plane, the fault growth is determined, The results show that the fault mass correction is helpful to reduce the risk of exploration and development in oil and gas field: 1) Prediction of the length of the tail of sub-seismic fault may lead to economic and sub-stack Economic prospect resources; 2) Fault location correction is the basis for the implementation of fault and well location configuration, Xishuangang block X9-4-31 well water Validating the reliability of fault location correction; 3) Confirming that the f074 fault in the Taibei ETDZ is composed of two side-column overlying faults, which obviously controls the type of fault ring and the quantitative evaluation of the seal; 4) At present, mudstone The smear coefficient (SSF) quantitatively evaluates the vertical segmental growth of the fault. The critical SSF value is 5 ~ 8, which is below the critical value, forming a typical mudstone smear seal. If it exceeds the critical value, a through fault is formed, leading to lateral leakage of oil and gas Or cross-layer aggregation.