Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 165-175.doi: 10.12108/yxyqc.20250315

• PETROLEUM EXPLORATION • Previous Articles    

Quantitative selection and application of well locations for encrypted wells in fractured-porosity carbonate rocks：A case study of Cambrian oil reservoirs in Tanghai Oilfield，Huanghua Depression，Bohai Bay Basin

ZHANG Qinglong, MAO Yuanyuan, FENG Jiansong, YUAN Xuansheng, ZHOU Wei, ZHU Fujin, XUAN Lingling   

  1. Onshore Oilfield, PetroChina Jidong Oilfield Company, Tangshan 063004, Hebei, China
  • Received:2024-05-13 Revised:2024-07-26 Published:2025-05-10

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Abstract: The formation energy of Cambrian fractured porous carbonate reservoirs in Tanghai Oilfield，Bohai Bay Basin decreases rapidly，and the overall recovery rate is low. In order to solve the problem of deploying encrypted well locations reasonably，a new method for quantitative optimization of well locations was proposed. The results show that：（1）The cumulative oil production of a single well in a fractured porous carbonate reservoir throughout its entire life cycle is mainly influenced by the combined effects of single well controlled movable remaining oil，average permeability of reservoir fractures，average thickness of single reservoir，average porosity of reservoir fractures，and average permeability of the matrix，with single well controlled movable remaining oil having the greatest impact.（2）The quantitative optimization method for well location is to comprehensively utilize logging，seismic，core thin section and other data to establish a three-dimensional geological model and a single well controlled movable residual oil model；Sort the relative importance of each influencing factor through correlation analysis of models，reservoir numerical simulation results and single well production performance data；Utilize the improved Analytic Hierarchy Process to calculate the weights of various influencing factors and the comprehensive“sweet spot”coefficient，and select the well locations with high comprehensive“sweet spot” coefficients for deployment.（3）This method has achieved good results in the optimization of well location targets in carbonate reservoirs of Cambrian Xuzhuang Formation and Maozhuang Formation in T180X2 Block of Tanghai Oilfield. All three exploration wells have achieved high single well production，with a cumulative oil production of 20 800 tons throughout the entire life cycle. The comprehensive“sweet spot”coefficient shows a good positive correlation with the cumulative oil production of a single well throughout its life cycle.

Key words: fractured-porous carbonate reservoir, infill wells, three-dimensional geological model, reservoir numerical simulation, improved analytic hierarchy process, comprehensive "dessert" coefficient, single well control of movable remaining oil volume, average permeability of reservoir fractures, Cambrian, Tanghai Oilfield

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  • TE344
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