Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 56-65.doi: 10.12108/yxyqc.20240606

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Application of ray-path elastic impedance inversion in carbonate gas reservoir prediction of the right bank of Amu Darya River

ZHANG Tianze1, WANG Hongjun1, ZHANG Liangjie1, ZHANG Wenqi1, XIE Mingxian2, LEI Ming2, GUO Qiang3, ZHANG Xuerui3   

  1. 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
    2. Research Institute of Petroleum Exploration and Development-Northwest, PetroChina, Lanzhou 730020, China;
    3. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China
  • Received:2023-11-23 Revised:2024-02-22 Online:2024-11-01 Published:2024-11-04

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Abstract: The reflection energy of middle-upper Jurassic Karlov-Oxfordian carbonate reservoir in the Agayry gas field on the right bank of the Amu Darya River is weak，and the signal-to-noise ratio of seismic data is low. Based on the analysis of reservoir characteristics and rock physics，the gas-bearing reservoir is predicted by prestack gather conditioning，well-seismic joint low-frequency impedance modeling，pre-stack ray domain elastic impedance inversion. The results show that：（1）The Calllovian-Oxfordian reservoirs in the middle and upper Jurassic of the Agayry gas field are mainly gentle slope carbonate rocks in the front edge of the platform. The lithology is mainly sandy limestone and bioclastic limestone. The reservoir space is dominated by pore-fracture type，which has the characteristics of low porosity，low permeability and strong heterogeneity. The results of rock physics analysis show that the effective gas-bearing reservoirs are mainly characterized by low longitudinal wave impedance，low shear modulus and low bulk modulus，and the shear modulus is the most sensitive to gasbearing reservoirs.（2）The pre-stack gathers are processed by means of prediction elimination denoising，singu lar value decomposition denoising and spectral balance energy compensation，which can effectively remove highfrequency and random noise such as abnormal amplitude，improve the effective signal strength and enhance the AVO characteristics at far offset. The well-seismic joint modeling method solves the problem of multi-solution inversion caused by the lack of low-frequency information of seismic data by introducing low-frequency layer velocity，which improves the inversion accuracy and effectively characterizes the lateral change of reservoir. The pre-stack ray domain elastic impedance inversion method has a good application effect in the study area. The P-wave and S-wave impedance inversion results show high resolution in both vertical and horizontal directions. The predicted gas-bearing reservoir thickness is more than 85% consistent with the results of logging interpreta tion. At the same time，the inversion indicated that lateral continuity of the gas layer is poor，which is consistent of the sedimentary characteristics of the gentle slope beach.（3）The carbonate reservoirs in the study area are favorable areas of exploration and development potential. There are many obvious gas shows in the undrilled areas in the east and southwest. The gas-bearing display of the upper Gap-XVhp is better.

Key words: ray-path elastic impedance inversion, carbonate reservoir, pre-stack gather conditioning, wellseismic tie, rock physics analysis, Gap-XVhp, Callovian-Oxfordian stage, Jurassic, Agayry gas field, right bank of Amu Darya

CLC Number: 

  • P631.4
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