Oil & Gas Geology ›› 2017, Vol. 38 ›› Issue (5): 963-972.doi: 10.11743/ogg20170515

Previous Articles     Next Articles

Provenance of sediments and its effects on reservoir physical properties in Lishui Sag,East China Sea Shelf Basin

Chen Chunfeng1,2, Zhong Kai3, Zhu Weilin1, Xu Donghao2, Wang Jun2, Zhang Bocheng2   

  1. 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
    2. Shanghai Branch of CNOOC Ltd., Shanghai 200335, China;
    3. China National Offshore Oil Corporation, Beijing 100025, China
  • Received:2017-03-23 Revised:2017-07-19 Online:2017-10-28 Published:2017-11-10

Abstract: In order to determine the provenance of sediments and play fairways in Lishui Sag,East China Sea Shelf Basin,we analyzed and characterized the provenances of the sediments in the sub-sags in eastern and western Lishui Sag through detrital zircon U-Pb dating and discussed the influences of different provenances on the physical properties of sandstone reservoirs in the Sag.The results show that sediments in the west sub-sag were mostly sourced from Minzhe Uplift Zone in the western part of the Sag where volcanic rocks are predominant with some intrusive and metamorphic rocks.The sandstone formed by sediments sourced from this provenance has high plastic content and low resistance to compaction,thus porosity loss is relatively largeduring compaction processes.The sediments in the east sub-sag were mostly sourced from Yushan Uplift Zone in the eastern part of the Sag where sedimentary rocks and intrusive rocks are predominant.The sandstone formed by sediments sourced from this provenance has low plastic content and strong resistance to compaction,thus porosity loss is relatively small during compaction.It is suggested that the provenance differences indeed have certain impact upon the physical properties of the reservoirs in the Sag.

Key words: U-Pb dating, detrital zircon, provenance, reservoir physical property, Lishui Sag, China East Sea Shelf Basin

CLC Number: