Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 29-36.doi: 10.12108/yxyqc.20230403

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and formation mechanism of hydraulic fractures in tight conglomerate reservoirs of Triassic Baikouquan Formation in Mahu Sag

QIN Jianhua1, WANG Jianguo2, LI Siyuan1, LI Sheng1, DOU Zhi2,3, PENG Simi2   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. China University of Petroleum(Beijing), Beijing 102249, China;
    3. Urumqi Branch, Research Institute of BGP, CNPC, Urumqi 830026, China
  • Received:2022-08-01 Revised:2022-11-26 Online:2023-07-01 Published:2023-07-01

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Abstract: The distribution of hydraulic fractures is very important for the efficient development of tight conglomerate reservoirs. Through the observation of fractures in the core from the horizontal coring well MaJ02 in the fractured conglomerate oil area of Mahu Sag，the type，occurrence，formation，opening，density and proppant filling of hydraulic fractures in the tight conglomerate reservoirs of Triassic Baikouquan Formation in Mahu Sag were analyzed，their distribution characteristics were clarified，and the formation mechanism was discussed. The results show that：（1）The hydraulic fractures developed in the cores of Baikouquan Formation in well MaJ02 account for 77.6% of the total number of fractures，with a strike of 90°-110 ° and a dip angle of 70°-90°. （2）The shear fractures formed by strike-slip mechanism in the study area account for 65.8%，followed by tensile fractures formed by tensile stress，accounting for 34.2%. Most of the shear fractures are in groups with small openings and fully filled，and the fracture surface is mainly through gravel，and multiple cracks are superimposed to form a fracture network fracture zone. The tensile fractures are mostly single with relatively large openings and irregular fracture surface，which are fully or half-filled，and the fracture surface is mainly surrounded by gravel.（3）The smaller the distance between the coring well and the fractured well in the study area，the smaller the perforation cluster spacing in the fracturing section，and the greater the hydraulic fracture density. Under the same fracturing engineering conditions，the fractures of argillaceous supported floating conglomerate facies and front sheet sand microfacies are relatively developed. The higher the sand content，the greater the hydraulic fracture density.

Key words: tight conglomerate, hydraulic fracture, tensile fracture, shear fracture, formation mechanism, Baikouquan Formation, Triassic, Mahu Sag

CLC Number: 

  • TE122.2
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