中文摘要：

隐性断裂带（断裂趋势带）是指盆地沉积盖层内发育的弱变形（隐蔽性较强）构造带,属于断裂带形成演化早、中期阶段的产物,由于缺乏明显的断裂面（带）和显著的位移而难以识别.在对苏北盆地、渤海湾盆地隐性断裂带研究基础上,于歧口凹陷识别出基底断裂走滑型隐性断裂带,并分析其特征、形成机制、控藏作用等.该断裂趋势带其自南向北可以分3 个区段：南段基底断裂与盖层断裂体系直接连接构成花状构造;中段古近系的花状构造终止于沙二段,新近系仅发生挠曲变形,成为东西侧不同构造单元、南北部不同构造特征的平衡点; 北段新近系发育的花状构造深部收敛于古近系的重力滑脱断层,基底断裂通过影响滑脱断层控制盖层断裂体系.研究结果表明,古近系基底断裂扭动作用主要以直接传递、调节传递、间接传递等3 种方式控制影响盖层中隐性断裂带的形成.深部隐伏断裂切人基底,有利于热作用传递而促进烃源岩成熟;盖层中的隐性断裂带控制了沉积体系和隐蔽性圈闭的形成和分布; 隐性断裂带的观点丰富了构造地质学理论,为油气勘探提供了新认识.

英文摘要：

Concealed fault zones or fault trend zones formed in the cap rocks of sedimentary b a sin , ＂which is influenced by theregional or local stress field, and activities in the basem ent rift system. A concealed fault zone is characterized by strong concealment and is associated with dominant fault zone. Based on the previous research of Subei and Bohai bay b asin s, usingbasement structure, structural framework, small dominant structure, seismic section features and coherent slices of HuanghuaSag, we recognized a NNE concealed fault zone and analyzed its characteristics, formation m echanism , and hydrocarbon accumulationpotentials. The results show that the newly found concealed fault can be divided into three different tectonic deformationsections, the flower structure linked by the basement rift and the cap rock rift system in the south p art; the Paleogeneflower structure ended in the second member of Shahejie Formation in the middle part where bending deformations onlyoccurred in the Neogene stratum and became the balance point of different structural units; and the flower structure developedin the Neogene stratum of north part deeply converged to gravitational detachm ent fault of Paleogene, where basement rift controlled the cap rock rift system by affecting gravitational detachm ent fault balance point. Studies show that former Paleogenebasement rift twist controlled and affected the formation of concealed fault zone in the cap rock in three form s： direct transmission, regulatory transmission and indirect transmission. Deep buried faults cut into the basem ent, facilitating heat transferto accelerate the maturity of source rock. Concealed fault zones in the cap rock controlled the formation and the distribution ofthe sedimentary system and disguised traps. The viewpoint of concealed fault zone enriches structural geology theory and providesa new understanding for oil and gas exploration.