Abstract：Existing research results cannot fully support the exploration and development of block A in the Muglad Basin due to the special tectonic positions, complex faults and diversified structural patterns in this area. In this regard, structural zoning is re-divided to study the active periods of faults in depth. In addition, the activity differences among structural units are compared and the tectonic evolution history is restored to clarify the relationship between tectonic evolution and hydrocarbon accumulation. Results demonstrate the following points:①The tectonic evolution of block A has experienced pre-rift, syn-rift and post-rift periods. Then the syn-rift period was further divided into three tectonic stages, namely the Early Cretaceous to the Late Cretaceous, the Late Cretaceous to the Paleocene and the Eocene to the Pliocene, controlling source rocks, structural traps and hydrocarbon distribution, respectively. ②Block A, from east to west, can be divided into two tectonic zones:an inheritably stable zone and a continuously active zone. The former is typical of the east and west slopes of the Kaikang trough, with a "strong-strong-weak" fault pattern during evolution, while the latter is typical of the Kaikang trough, with a "strong-strong-the strongest" pattern. ③Two patterns of hydrocarbon migration and accumulation in block A are presented, namely the deep play and the late- adjustment play. They are common in the east and west slopes of the Kaikang trough with a low level of fault activities and the Kaikang trough with multi-layer reservoirs and continuous fault activities, respectively. The above research can support oil and gas exploration in basins with similar geological settings.
ALIYEVA Gunay, 黄志龙, 金振奎, 聂其海, 张修强, 赵刚. 穆格莱德盆地A区块构造特征对油气分布的影响[J]. 石油地球物理勘探, 2021, 56(1): 172-180.
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