Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 66-78.doi: 10.12108/yxyqc.20220407

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Reservoir characteristics and controlling factors of the second member of Paleogene Shahejie Formation in southeastern margin of Liaodong Sag

WANG Maozhen, WU Kui, GUO Tao, HUI Guanzhou, HAO Yiwei   

  1. Tianjin Branch, CNOOC China Limited, Tianjin 300459, China
  • Received:2021-09-13 Revised:2021-12-09 Online:2022-07-01 Published:2022-07-07

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Abstract: Sandy conglomerate is developed in the second member of Paleogene Shahejie Formation(E2s2)in the southeastern margin of Liaodong Sag. Based on the data of sidewall coring,thin section identification and element analysis,the reservoir characteristics and controlling factors of sandy conglomerate of E2s2 in southeastern margin of Liaodong Sag were analyzed from the aspects of parent rock properties,sedimentary characteristics and diagenesis. The results show that:(1)The porosity of sandy conglomerate reservoirs in the study area ranges from 3.5% to 19.0%,with an average of 10.1%,and the permeability is 0.9-120.6 mD,with an average of 39.8 mD. The overall physical properties are characterized by low porosity and low permeability,and gradually improve from north to south.(2)The sandy conglomerate with fracture developed is a high-quality reservoir in the study area,and its parent rock is metamorphic quartzite. High-quality reservoirs with high composition maturity are developed in the lower part of concordant fault slop-break zone of distal braided river delta. Argillaceous shrinkage fractures and dissolution can improve the physical properties of the reservoirs in the south section of the study area,and carbonate cementation is destructive to the physical properties of the reservoirs in the north section of the study area.(3)The concordant fault slop-break zone in gentle slope zone is conducive to the formation of inherited fracture sandy conglomerate reservoirs,and the local high parts of nearshore ancient landform are easy to form mixed beach high-quality reservoirs, both of which are potential areas for next lithologic reservoir exploration.

Key words: sandy conglomerate, low porosity and low permeability, fractures, gentle slope zone, lithologic reservoir, the second member of Shahejie Formation, Paleogene, Liaodong Sag

CLC Number: 

  • TE122.2
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