Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 49-58.doi: 10.12108/yxyqc.20250505

• PETROLEUM EXPLORATION • Previous Articles    

Reservoir characteristics and main controlling factors for hydrocarbon accumulation of the fourth member of Sinian Dengying Formation in the west side of Deyang-Anyue Rift，Sichuan Basin

LUO Bing, ZHOU Gang, MA Kui, WANG Wenzhi, XU Shaoli, WU Luya, WANG Yueyun, ZHANG Xin   

  1. Research Institute of Petroleum Exploration and Development, Southwest Oil and Gas Field Company PetroChina, Chengdu 610041, China
  • Received:2025-04-09 Revised:2025-04-14 Published:2025-09-06

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Abstract: Based on core observations of hand specimens，rock thin section identification，well logging data analysis，and seismic profile interpretation，the petrological characteristics，sedimentary facies distribution，reservoir characteristics，and source-reservoir configuration relationship of the fourth member of Sinian Dengying Formation in the west part of Deyang-Anyue Rift of Sichuan Basin were characterized，and the main controlling factors for reservoir formation and hydrocarbon accumulation were clarified. The results show that：（1）The fourth member of Dengying Formation in the west part of Deyang-Anyue Rift develop two subfacies：restricted platform and platform margin. The restricted platform subfacies can be further divided into three microfacies： mound-shoal，platform flat，and platform depression. The platform margin subfacies can be divided into two microfacies：mound-shoal and inter-shoal sea.（2）High-quality reservoirs of the fourth member of Dengying Formation are mainly composed of the algal grainstone，algal-clotted dolomite，and algal-laminated dolomite in the mound-shoal microfacies. The types of reservoir spaces are diverse，such as pore type，karst cave-pore type，and fracture type，mainly consisting of framework pores，intergranular dissolution pores，intercrystalline pores，intercrystalline dissolution pores，and karst cave. The reservoirs of the fourth member have undergone multistage diagenetic modification，the main destructive diagenetic processes include compaction，cementation，and filling， while the constructive diagenetic process is multiphase dissolution.（3）The main controlling factors for hydrocarbon accumulation in the fourth member of Dengying Formation in the west side of the rift mainly are paleo-rift control on source rocks，lithofacies and karst control on reservoir quality，paleo-uplift control on hydrocarbon accumulation，and late-stage structural control on traps.

Key words: platform margin, mound-shoal, algal-clotted dolomite, karstification, paleo-rift, paleo-uplift, the fourth member of Dengying Formation, Sinian, Deyang-Anyue Rift, Sichuan Basin

CLC Number: 

  • TE122
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