Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 691-700.doi: 10.13278/j.cnki.jjuese.201503104

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Palynofacies Characteristics and Formation Environment of Permian Source Rock in South Yellow Sea Basin

Tan Sizhe, Gao Shunli, Ge Heping, Fu Yanxin   

  1. Shanghai Branch of CNOOC Ltd., Shanghai 200030, China
  • Received:2014-09-04 Published:2015-05-26

Abstract:

The development of hydrocarbon source rock and its sedimentary environment are closely related. Based on the theory and the application of the palynofacies, we discussed the formation environment of the source rock of Permian Dalong Formation,Longtan Formation, and Qixia Formation in South Yellow Sea basin. By the systematic analysis of the pollen and the organic matter of the typical drilling profiles for their abundant characteristics and composition types, and combined with the plankton algae and the sign of organic matter of the favorable hydrocarbon source rocks, the hydrocarbon generation potential was evaluated finally in this article. The results show that the hydrocarbon generation potential and the formation environment of a high mature marine source rock could be evaluated objectively through a palynological study. The source rock in Qixia Formation are dominated by amorphous organisms with high productivity, and was formed in far-continental shelf with anoxic environment, which provided good conditions for the development and preservation of hydrocarbon source rocks. The organic matters in Dalong Formation are also dominated by amorphous organisms, but the hydrocarbon generation potential is inferior to Qixia Formation. The source rock in Longtan Formation was formed in oxygen aeration continental shelf area,and the organic matters are dominated by coaly organisms and mainly of terrigenous input. The frequent change in sedimentary water is infavorable for the formation of the hydrocarbon source rocks.

Key words: South Yelow Sea basin, Permian, palynofacies characteristics, carbonate, source rock, sedimentary environment, hydrocarbon potential

CLC Number: 

  • P534.46

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