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通过对比测井曲线和绘制黄57井区K1标志层顶部构造图,发现个别井存在井点断层和部分相邻井间K1标志层顶构造连线变化趋势发生突变,证明黄57井区存在一系列小型断裂系。其走向北北西——南南东、断面西倾。晚三叠世长4+5~长2沉积期该断层开始活动,上盘下降并在断裂前形成了相对较厚的沉积,中侏罗世延安组沉积期断层停止活动;中侏罗世直罗组沉积期正断层复活,再一次在断裂前形成较厚沉积;从晚侏罗世安定组沉积期开始,该断层反转为具有左旋走滑性质的逆断层,到早白垩纪末环河组沉积时期断层停止活动。在侏罗纪末到早自垩世东西向压力和晚白垩世至渐新世早期区域侧向挤压下,在研究区形成了一系列构造圈闭,来自长7优质烃源岩的油气经断裂运移到圈闭,形成了构造油气藏,沿断裂带是构造油气藏分布的有利区域。
By comparing the well logging curves and drawing the top of the K1 marker in the Huang 57 well, it is found that there is a sudden change trend in the connectivity of the top of the K1 marker at the well point fault and some adjacent wells in individual wells, which shows that there is a Series of small fracture system. Its north-west-south-south east section of the west slope. The Late Triassic Chang 4 + 5 ~ Chang 2 sedimentary period began the activity of the fault, the plate down and formed a relatively thick sediments before the fracture, the Middle Jurassic Yan’an Formation during the sedimentary fades cease activities; Middle Jurassic Luo Group The normal faulting during the sedimentary period was revived and again formed thick sediments before the fault. From the sedimentary period of the Late Jurassic Sedimentary Group, the fault reversed to a reverse fault with left-lateral strike-slip property. By the end of the Early Cretaceous, Period of the fault stop activities. From Late Jurassic to Early Cretaceous east-west pressure and late Cretaceous to Late Oligocene crust, a series of structural traps were formed in the study area. Hydrocarbons from the Chang 7 high-quality source rock Faults migrate to the trap and form structural reservoirs, along the fault zone is a favorable area for the distribution of the structural reservoirs.