Geologic Features and Hydrocarbon Exploration Potential of Middle-and Low-Buried Hill in Qikou Sag
Received date: 2010-03-07
Revised date: 2010-05-27
Online published: 2010-08-10
The reconstruction of complex basement faults in Mesozoic and Cenozoic caused a lot of buried hill formation in the Qikou sag of the center Bohai Bay basin. We use the new three-dimensional seismic data to find the different level buried hills, suggesting that two types of residual and fault-block buried hills would be controlled by the Indosinian palaeostructure and Paleogene basin-margin faults, respectively. The residual hill is mainly developed in the north of the coastal rifting, and the favorable exploration target is Ordovician. Meanwhile, the fault-block buried hill lies in the south of the coastal rifting, and the preferential exploration target is Ordovician, Permian and Mesozoic. The Qikou sag is located within the center of hydrocarbon generation intensity, so the abundant petroleum in the middle-and low\|buried hills is filled. Although the alteration of faults and folds in Mesozoic and Cenozoic happened, and even the strong weathering erosion existed, the development of favorable reservoir would make the good potential for hydrocarbon exploration in the Qikou sag.
Key words： Qikou sag; Buried hill; Exploration potential; Middle-and low-buried hill.
FU Li-Xin, LOU Da, FENG Jian-Yuan, CI Guo-Shuai, YAN Hui-Zhong . Geologic Features and Hydrocarbon Exploration Potential of Middle-and Low-Buried Hill in Qikou Sag[J]. Natural Gas Geoscience, 2010 , 21(4) : 559 -565 . DOI: 10.11764/j.issn.1672-1926.2010.04.559
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