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运用断层生长指数联合断层垂直活动速率方法,判断同生断裂活动时期为铜钵庙组~南屯组沉积时期、伊敏组时期和青元岗组沉积时期,同时,根据断层伸展率和伸展速率的研究得出,同生断裂在南屯组沉积时期变形强度较大,为断层活动的主要关键时期.同生断裂经历了从小到大、从新到老的过程,总体表现为纵向上断裂活动多期性,且由深到浅断裂活动强度逐渐减小的特点,横向上不同位置走向具有分段明显,并利用断裂分段生长点确定了断裂传递带的位置.在此基础上,总结了乌尔逊-贝尔凹陷南屯组主要发育2种控砂模式——同生断裂下降盘控砂和分段生长点控砂模式.同生断层控砂模式与地层沉积演化序列相一致,不同的沉积演化决定了断层控砂类型.南一段主要以断层下降盘和分段生长点控砂为主,南二段表现为断层分段生长点控砂,其中断层下降盘控砂发育有限,主要发育在南一段巴彦塔拉构造带处,断层分段生长点控砂在盆地发育较广泛,是油气聚集的有利场所.
By using the method of fault growth index and vertical movement rate of faults, we can conclude that the active periods of synsegenenesis are deposition period of Tongbomiao ~ Nantun, Yimin, and Qingyuangang Formation. At the same time, according to fault extension rate and extension rate The study shows that the syn-ruptures have a large deformation intensity during the deposition of the Nantun Formation and are the key periods of fault activity.The syngenetic faults have experienced the process from small to large and from new to old, with the overall vertical fault activity Period, and the activity intensity decreases gradually from deep to shallow fault, the trend of fault location is obvious at different positions in horizontal direction, and the position of fault transmission belt is determined by the fracture growing point. On this basis, There are mainly two kinds of sand control modes in the Nelson Formation of the Beier sag (Belden Depression): controlled sands of synclinal declination descending disk and point-controlled sand grading growth control mode. The sand control mode of the syenitic fault coincides with the sequence of sedimentary evolution of sedimentary strata, and different sediments The evolution determines the type of sand control in the fault.The south section is dominated by the fault descent tray and the sectionally controlled sand, while the second section of the second section shows the sand control of the fault section growth and sand control, The main period of development in the south tectonic belt at Bayantala, segmentation fault growing point of control in the sand basin development is more extensive and favorable oil accumulation.