Research And Application Of Reservoir And Fluid Prediction Technique In Carbonate

Sedimentary context of fracture-cavity pattern carbonate reservoir in western region of Northern Tarim Uplift are open platform and interbank sea,reservoir lithology is relatively unmixed,it is easily impacted by faulted structure and kastification and it usually formed fracture-cavity pattern carbonate reservoir with strong dimensional aeolotropic property.Burial depth of carbonate in this area is extremely deep so the carbonate bed had experienced multiple phase reconstruction caused by tectonic movement.It is challenge to predict hydrocarbon within carbonate reservoir,this hardship restricted the process of exploratory development in this region.Through review relationship between development background of reflection wave method of seismic exploration and reserve improvement of carbonate,it concluded reservoir and fluid predication method of fracture-cavity pattern carbonate with reflection seismic from amplitude interpretation,seismic facies analysis,discontinuity fracture analysis technique,3D visualization analysis method,simultaneous inversion and AVO fluid prediction,analyzed effective seismic method to depict the distribution of fracture and vug,then indicated trend of reservoir and fluid predication of fracture-cavity pattern carbonate.Research firstly utilized analysis method related sedimentary facies and structural pattern to research reservoir category and generation mechanism.Through utilized discontinuity fracture analysis and seismic facies method,spatial distribution pattern of fracture and vug was delineated,it combinated petrophysical analysis and simultaneous inversion,further verified spatial distribution regular of fracture and vug by intersection projection with P-wave and S-wave impedance.Based on these research,reservoir quantification research was carry out.Meantime,utilized fluid substation and forward modeling to do feasibility research of AVO inversion and extracted AVO fluid factor through AVO inversion.Finally,based on reservoir quantification research and result of AVO fluid prediction,comprehensive evaluation of fracture-cavity style carbonate reservoir was fulfilled.The research demonstrated the following findings were rooted.According to petrophysical analysis and sensitive petrophysical parameter related fracture-cavity pattern carbonate reservoir,then utilized these optimized parameter guided the workflow of simultaneous inversion and obtained the IP and IS volume which were valuable to prediction of fracture and vug distribution.Through intersection projection data which could represent the distribution of fracture and vug with IP and IS volume,combination with discontinuity fracture analysis and seismic facies analysis,future verified the distribution regular of fracture and vug,then reservoir quantification research was carry on,this research method is an effective method to depict distribution of fracture and vug.AVO Fluid prediction method to fracture-cavity pattern reservoir is more validated,application this method to predict hydrocarbon of H13 well,the exploratory breakthrough was obtained.Utilizing AVO fluid factor and reservoir quantification characterization to evaluate of fracture-cavity pattern carbonate reservoir are more objective.Through theory research and practice application,it represented applicable research method to predict hydrocarbon in carbonate reservoir,research of this thesis have reference valuable to same category carbonate reservoir.