Halahatang area is an important area for oil and gas production in the Tarim Basin, and it has important significance for oil and gas exploration and development to carry out tectonic evolution study in this area. Based on the newly acquired seismic datas and drilling datas, the tectonic evolution is analyzed by unconformity analysis and balanced cross section, and the paleo-tectonic map of Lower-Middle Ordovician top is restored in different periods by layer flattening technique. And then the control effect of tectonic evolution on oil and gas reservoir is discussed in the study area. The results show that the Halahatang area has experienced 6 stages of tectonic evolution: the stable carbonate platform stage in Early Caledonian, the south dipping slope stage in Middle-Late Caledonian, the west dipping slope stage in Early Hercynian, the passive depression stage in Late Hercynian-Indosinian, the stable subsidence stage in Yanshan-Early Himalayan, the structural reversal and stereotyped stage in late Himalayan and nowadays. The top of Lower-Middle Ordovician keeps the shape of south dipping slope in long-term period from the Middle Caledonian. The overall structural pattern changes little and just the direction of the tectonic axis and structural highs change slightly. Since the Late Himalayan period, the tectonic inversion occurred in the study area, and the top of Lower-Middle Ordovician becomes west dipping nose structure. The tectonic evolution in Halahatang area controls the development of Ordovician karst reservoir and hydrocarbon enrichment.
Ma Debo Chen Lixin Tao Xiaowan Yuan Jingyi Zhou Chunlei Li Tingting. The tectonic evolution and its petroleum geological significance in Halahatang area, Tarim Basin[J]. Chinese Journal of Geology, 2018, 53(1): 87-104.