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渤南地区郯庐断裂带具有很好的油气勘探前景,但由于其构造特征复杂,目前对渤南地区油气成藏条件、主控因素及富集规律的认识尚不明晰.通过对三维地震和地质资料的分析解释,结合前人研究成果,探讨了渤南地区郯庐断裂带构造特征的时空差异及其对盆地结构的控制作用.研究表明,渤南地区郯庐断裂带具有3组分支断裂,每组分支断裂由2~4条断裂构成,均表现出了明显的走滑特征,整体由东向西、由深至浅走滑程度逐渐减弱.新生代古新世-早始新世郯庐断裂带渤南段左旋走滑,东部分带活动明显、强度大,中带和西带不活动或活动较弱,渤南地区中生代发育的NWW向伸展断裂系统复活,形成北断南超的复式半地堑或南北双断式结构;中始新世以来,渤南地区郯庐断裂带转为右旋走滑,3组分支断裂均开始活动,表现为强烈的走滑兼伸展运动,强度由东向西逐渐减弱,中带分支断裂形成的中央构造脊将黄河口凹陷分割成东、西两个次洼,并开始逐渐发育一系列次级断层,与主断裂构成帚状断裂组合;新近纪-第四纪郯庐断裂渤南段表现为右旋走滑兼挤压,主走滑断裂不连续,代之以大量规模较小的次级断裂系统.太平洋区板块俯冲方向、俯冲速率的变化以及深部动力背景的变迁共同造成了渤南地区郯庐断裂不同分支构造发育演化及其控盆作用的差异性,由于右旋走滑位移量小于先期的左旋走滑,现今渤南地区构造单元分布仍具左旋特征.
However, due to its complex tectonic features, the current understanding of hydrocarbon accumulation conditions, main controlling factors and enrichment laws in Bonan area is not yet clear.Based on the analysis of 3D seismic and According to the results of previous studies, the spatial and temporal variations of the tectonic features of the Tan-Lu fault zone in Bonan area and its control over the basin structure are discussed.The results show that the Tanlu fault zone in Bonan area has three branches , Each group of branch faults is composed of 2 to 4 faults, all of which show obvious strike-slip features, and the whole is from east to west and the depth from shallow to shallow strike slip gradually weaken.The Cenozoic Pliocene-Early Eocene The left-lateral strike-slip of the Bonan section of the Lu fault zone shows obvious zonal activity and strong intensity in the eastern part, but inactivation or weak activity in the middle belt and zonal belt. The Mesozoic NWW extensional fault system in Bonan area revived to form the northern part of the south- Double half-graben or north-south double-break structure. Since the Eocene, the Tan-Lu fault zone in the Bonan area turned to dextral strike-slip and all three branch faults began to move, showing strong strike-slip and extension movements. The intensity From east to west gradually weakened in the belt The central structural ridge formed by the fault fractured the Huanghekou depression into two sub-depressions in the east and west and began to gradually develop a series of sub-faults that combined with the main fault to form a broom-shaped fault combination. The Neogene-Quaternary Tancheng fault Which is characterized by dextral strike-slip and compression, discontinuous main strike-slip faults, and replaced by a large number of smaller secondary fault systems.The subduction direction of the Pacific plate, the change of the subduction rate and the change of the deep dynamic background jointly cause the Bohai Sea Since the divergence of right-lateral strike-slip is less than that of the previous left-lateral strike-slip, the tectonic units in the Bonan area are still left-handed in the South China.