Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 1-12.doi: 10.12108/yxyqc.20220401

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Connotation,evaluation and optimization of tight oil sweet spots: A case study of Cretaceous Xiagou Formation in Qingxi Sag,Jiuquan Basin

LUO Qun, ZHANG Zeyuan, YUAN Zhenzhu, XU Qian, QIN Wei   

  1. Unconventional Natural Gas Institute, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2022-03-09 Revised:2022-04-07 Online:2022-07-01 Published:2022-07-07

Abstract: The tight oil sweet spot is a core area for tight oil exploration and development. Through the study on the accumulation and enrichment law of Cretaceous tight oil reservoirs in Qingxi Sag,Jiuquan Basin,the connotation,evaluation and optimization methods of tight oil sweet spots were revealed. The results show that:(1)Tight oil sweet spots are relatively high abundance oil-bearing areas(or strata)under the overall low abundance oil-bearing background in fine-grained sedimentary system of petroliferous basin. Tight oil sweet spots can be divided into five categories:physical sweet spot,reservoir sweet spot,engineering sweet spot,productivity sweet spot and economic sweet spot. Physical sweet spot and reservoir sweet spot are collectively referred to as geological sweet spot.(2)The main geological factors controlling tight oil sweet spots include lithology combination characteristics,source and reservoir quality,source reservoir assemblage and fracture development degree.(3)The evaluation and optimization methods of tight oil sweet spots are:high-quality source rocks and Ro determining tight oil distribution,source-reservoir assemblage determining favorable tight oil zones,the matching of four excellent factors(high quality source rocks,high quality reservoirs,well-developed fractures and favorable matching of these factors in time and space)determining tight oil sweet spot,and multi-layer superimposition determining tight oil exploration and development well trajectory.

Key words: tight oil sweet spot, connotation, enrichment, main controlling factors, Xiagou Formation, Cretaceous, Qingxi Sag, Jiuquan Basin

CLC Number: 

  • TE122
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