Received date: 2011-07-14
Revised date: 2011-12-03
Online published: 2011-12-10
The sedimentary rock distributes extensively with large thickness in the Qikou rifted basin. As a result of provenance development both inside and outside the basin and frequent tectonic movements,the sedimentary environment and depositional systems are various. In the sag,the widespread oil shale is developed with exception of lacustrine shale. During the period of oil shale formation,the coccolithophorid in the oil shale and calcareous shale was developed,since the algae mass growth occurred under the sea water function. Based on the theory of hydrocarbon generation for hydrocarbon-enriching source rock,we classify the source rocks in the Qikou sag. The source rocks in the Qikou sag are characterized as large thickness,organic matter type and abundance of organic matters. Also,as a result of over pressure developed in the deep formation,the depth for the mature threshold of source rock is big with long hole section under the abnormal over pressure. Therefore,the depth for the threshold of large oil and gas generation is larger than that of general source rock. So the time of gas generation is short,with sustained oil generation and centralized gas generation. The characteristic of thermal evolution obviously controls the distribution of deep oil and gas formation in the Qikou sag.
YU Xue-Min, HE Yong-Mei, JIANG Wen-Ya, LIU Qiang-Xin, LIANG Bo-Xun, ZOU Lei-La . Hydrocarbon Generation of Paleogene Source Rocks in Qikou Sag[J]. Natural Gas Geoscience, 2011 , 22(6) : 1001 -1008 . DOI: 10.11764/j.issn.1672-1926.2011.06.1001
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