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火成岩(图a)下第三系始新统末期的华北运动I幕,对廊坊一固安凹陷的沉积史有较大的影响,主要表现在沙三段与沙四段地层呈角度不整合接触,同时沿大兴断层和基底断层发生岩浆活动,导致火成岩顺层侵入地层内。LF5ll地震剖面上的沙三段地层是一个完整的箱状背斜,与下伏的沙四段地层呈角度不整合接触。在2.7s以下靠近大兴断层根部的强反射为深水扇的反映,其右侧几组强反射均为火成岩的反映。火成岩的强反射与沙四段地层产状一致。两组火成岩之间夹有泥岩、粉砂岩。经曹5井钻探证实火成岩的存在,并在火成岩及泥岩裂隙中获得了工业油气流。——赵翠芬
The I-North China movement at the end of the Eocene in the late Paleocene under igneous rocks (Fig. A) has a great influence on the sedimentary history of the Yiguangan Sag in Langfang, mainly due to the angular unconformity between the Es 3 and Es 4 formations At the same time, magmatic activities occur along the Daxing fault and basement faults, causing the igneous rocks to intrude into the strata. The third member of the third member of the LF511 seismic profile is a complete box-shaped anticline that is angularly in contact with the underlying Sha 4 member. The strong reflections near the root of Daxing fault below 2.7s are the reflection of deep-water fan. The strong reflections on the right are all the reflection of igneous rocks. The strong reflection of igneous rocks is consistent with that of the fourth member of Shahejie Formation. Mudstone and siltstone are sandwiched between two sets of igneous rocks. Drilling in Well Cao 5 confirmed the existence of igneous rocks and obtained industrial oil and gas flow in igneous and mudstone fractures. - Zhao Cui Fen