Citation: | WANG Chao, TANG Xianjun, JIANG Yiming, HE Xinjian, TAN Sizhe. Characteristics of the structural transfer zone of northern Tiantai slope in Xihu Sag of the East China Sea Basin and their petroleum geological significances[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 93-105. doi: 10.16562/j.cnki.0256-1492.2020030201 |
The northern Tiantai slope of the Xihu Sag, next to the Pinghu oil and gas field, is an important exploration target for future replacement. After a through review of the structural characteristics of the slope, this paper is devoted to the analysis of structural styles and evolutionary process of the transfer zone and their significance to petroleum accumulation. The results show that, in terms of structural characteristics, the structural transfer zone of the northern Tiantai Slope is developed upon the NWW Zhoushan-Guotou basement fault zone under the control of the “North-south Blocking”, where a special reverse fault terrace occurs. The northern Tiantai slope can be further divided into two secondary transfer types: the buffering type in the north and the transferring in the south. The torsional transfer structure, along the NWW basement fault, is strong in the south but weak in the north, which is called the faults of "reticulation type" and "horsetail type" respectively in this paper in view of the fault combination. In terms of genetic evolution, the structural transfer zone of the northern Tiantai Slope is developed in the early period of fault subsiding up to late compression and reversal period, showing a continuous and progressive evolutionary process, which adjusts the difference of extension and compression strength of NE-NNE fault system between the north and the south and by which the original extension direction of some faults is changed. Finally, it is revealed that the fault combination under the control of structural transfer in the northern Tiantai slope area is not only favorable to the forming of various twisted trap, but also favorable to the vertical migration and recharge of oil-gas along the twisted faults. Under the control of structural transfer zone, the northern Tiantai slope is also a favorable area for the deposition of Pre-Pinghu high-quality sandy deposits.
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Geological background of the structural transfer zone in south-central Xihu Sag,the East China Sea
Seismic profiles across south-central Xihu Sag (see Fig.1 for profile location)
North-south seismic profiles across northern Tiantai slope of Xihu Sag (see Fig.1 for profile location)
Distribution map of igneous rocks in northern Tiantai slope zone
Evolutionary model of the transfer fault combination in northern Tiantai slope zone
Evolution of the transfer zone in northern Tiantai slope
Index chart of typical fault of Tiantai slope
Trap-control model of torsional transfer structure for northern Tiantai slope
Reservoir developing model of the transfer zone of northern Tiantai slope
Hydrocarbon accumulation models on the northern Tiantai slope