Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (2): 33-42.doi: 10.12108/yxyqc.20240204

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary model of sublacustrine fan of the third member of Paleogene Dongying Formation and large-scale oilfield discovered in western slope of Liaozhong Sag

NIU Chengmin, HUI Guanzhou, DU Xiaofeng, GUAN Dayong, WANG Bingjie, WANG Qiming, ZHANG Hongguo   

  1. Tianjin Branch of CNOOC Limited, Tianjin 300459, China
  • Received:2023-02-12 Revised:2023-04-17 Online:2024-03-01 Published:2024-03-06

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Abstract: Through stratigraphic sequence research，paleogeomorphological restoration，zircon dating and seismic data analysis，the sublacustrine fan development model of the third member of Paleogene Dongying Formation（Ed3）in western slope of Liaozhong Sag was discussed from the aspects of source system，paleogeomorphology and slope break system and lake level change，and the reservoir characteristics and accumulation model were studied. The results show that：（1）The sand bodies of the sublacustrine fan in the western slope of Liaozhong Sag are characterized by a sand-rich model controlled by“source-slope break zone-lake level”. The sources are mainly from Yanshan fold belt，followed by Liaoxi uplift. Large-scale source supply and parent rock area of metamorphic rocks provide clastic materials and high-quality reservoir sand bodies for the formation of the sublacustrine fan. Sedimentary slope break zones control the unloading position of gravity flow in the sublacustrine fan， and the micro paleogeomorphic changes formed by the fault slope break zones control the direction of local sand body transport and the degree of differential enrichment. The coupling of lake level changes and source system changes has resulted in the repeated stacking and development of delta，lake，and sublacustrine fan sediments in space，providing good preservation conditions for the formation of lithologic traps.（2）The lithologies of the sublacustrine fan in Lvda10-6oilfield are mainly medium to fine grained feldspar lithic sandstone，with smaller particle size and mainly composed of gravity flow sedimentation. The pore types are mainly primary intergranular pores and dissolved intergranular pores，with a small amount of intragranular dissolved pores. The pore development is average and the connectivity is poor. The development of the sublacustrine fan has the characteristics of vertical multi-stage overlap and planar continuity. The middle fan subfacies of the sublacustrine fan located in the middle of the slope have obvious collapse deformation structures，making them the most favorable exploration facies zone.（3）The sublacustrine fan reservoir in Lvda 10-6 oilfield is a major discovery in the western slope of Liaozhong Sag shifted from structural trap exploration to lithological trap exploration，achieving a significant breakthrough in the exploration field of Paleogene sublacustrine fan type lithologic reservoirs in the slope zone of Bohai Oilfield，with 11 oil reservoirs and 9 gas reservoirs developed. The oil and gas reservoirs are mutually independent，with large reserves，high abundance，a proven oil equivalent of 3 000×104 t，good physical properties of crude oil and high production capacity for exploratory well testing. The reservoir accumulation model is a ternary coupling of“convergence ridge-source fault-parallel sand body”.

Key words: sublacustrine fan, paleogeomorphology, slope break system, sedimentary model, hydrocarbon accumulation model, slope zone, the third member of Dongying Formation, Paleogene, Liaozhong Sag

CLC Number: 

  • TE122.1
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