In the Sichuan Basin,carbonate reservoirs are characterized by deep burial depth and strong heterogeneity,so it is difficult to conduct structure steering,pore space reservoir tracking and trajectory control in the pr...In the Sichuan Basin,carbonate reservoirs are characterized by deep burial depth and strong heterogeneity,so it is difficult to conduct structure steering,pore space reservoir tracking and trajectory control in the process of geosteering logging while drilling.In this paper,a series of corresponding techniques for structure,reservoir and formation tracking were proposed after analysis was conducted on multiple series of carbonate strata in terms of their geologic and logging response characteristics.And investigation was performed on the adaptabilities of the following logging technologies to geosteering while drilling,including gamma ray imaging while drilling,resistivity imaging while drilling,density imaging while drilling,gamma ray logging while drilling,resistivity logging while drilling,neutron logging while drilling and density logging while drilling.After while drilling information was thoroughly analyzed,the logging suites for four common types of complicated reservoirs(thin layered reservoirs,thick massive reservoirs,denuded karst reservoirs and shale gas reservoirs)were optimized,and five logging combinations suitable for different formations and reservoirs were proposed,including gamma ray logging t porosity t resistivity imaging,gamma ray logging t resistivity imaging,gamma ray logging t porosity t resistivity logging,gamma ray imaging t resistivity logging,and gamma ray logging.Field application indicates that it is of great reference and application value to use this method for the first time to summarize logging while drilling combinations for different types of carbonate reservoirs.展开更多
Significant progress has been made in the exploration and development of unconventional gas resources in China since the beginning of the 21st century.With a rapid increase in yield,the exploration and development of ...Significant progress has been made in the exploration and development of unconventional gas resources in China since the beginning of the 21st century.With a rapid increase in yield,the exploration and development of shale gas have been upgraded to a level of national strategy.Logging is one of the core technologies in gas exploration and development.However,logging technologies face the challenges of complex geological conditions and well casing environment,high temperature,high pressure,and strong heterogeneity.Despite the rich experience accumulated,unified understanding and implementation specifications are yet to be established for shale gas well logging.Given the analysis and comparison of the effectiveness and adaptability of logging technologies at different stages of shale gas exploration and development for the Sichuan Basin,this study optimizes the log suite to meet the demand for highefficiency exploration and development of shale gas.According to the adaptability analysis of shale gas log suite,the mandatory logging items of exploratory wells should include caliper log(CAL),natural gamma ray spectrometry(NGS)log,spontaneous potential(SP)log,directional survey,borehole compensated sonic log,litho-density log(LDL),compensated neutron log(CNL),dual laterologmicrospherically focused log/dual induction-laterolog log/array induction log,temperature log,elemental capture spectroscopy(ECS)log,formation microimager(FMI)log,and array sonic log.The log suite of appraisal wells is almost the same as that for exploratory wells,excluding the ECS log and microresistivity scanning imaging.Meanwhile,for the logging of horizontal/highly-deviated holes,the log suite of vertical wells should be referred to according to specific well conditions.展开更多
基金Supported by“Well logging-based shale gas evaluation”,a sub-project of National Science and Technology Major Project(No.2011ZX05018-003)“Interpretation and supporting system development for electromagnetic wave imaging and well logging while drilling”,a China National Petroleum Corporation Science and Technology Major Project(No.2013E-3809).
文摘In the Sichuan Basin,carbonate reservoirs are characterized by deep burial depth and strong heterogeneity,so it is difficult to conduct structure steering,pore space reservoir tracking and trajectory control in the process of geosteering logging while drilling.In this paper,a series of corresponding techniques for structure,reservoir and formation tracking were proposed after analysis was conducted on multiple series of carbonate strata in terms of their geologic and logging response characteristics.And investigation was performed on the adaptabilities of the following logging technologies to geosteering while drilling,including gamma ray imaging while drilling,resistivity imaging while drilling,density imaging while drilling,gamma ray logging while drilling,resistivity logging while drilling,neutron logging while drilling and density logging while drilling.After while drilling information was thoroughly analyzed,the logging suites for four common types of complicated reservoirs(thin layered reservoirs,thick massive reservoirs,denuded karst reservoirs and shale gas reservoirs)were optimized,and five logging combinations suitable for different formations and reservoirs were proposed,including gamma ray logging t porosity t resistivity imaging,gamma ray logging t resistivity imaging,gamma ray logging t porosity t resistivity logging,gamma ray imaging t resistivity logging,and gamma ray logging.Field application indicates that it is of great reference and application value to use this method for the first time to summarize logging while drilling combinations for different types of carbonate reservoirs.
文摘Significant progress has been made in the exploration and development of unconventional gas resources in China since the beginning of the 21st century.With a rapid increase in yield,the exploration and development of shale gas have been upgraded to a level of national strategy.Logging is one of the core technologies in gas exploration and development.However,logging technologies face the challenges of complex geological conditions and well casing environment,high temperature,high pressure,and strong heterogeneity.Despite the rich experience accumulated,unified understanding and implementation specifications are yet to be established for shale gas well logging.Given the analysis and comparison of the effectiveness and adaptability of logging technologies at different stages of shale gas exploration and development for the Sichuan Basin,this study optimizes the log suite to meet the demand for highefficiency exploration and development of shale gas.According to the adaptability analysis of shale gas log suite,the mandatory logging items of exploratory wells should include caliper log(CAL),natural gamma ray spectrometry(NGS)log,spontaneous potential(SP)log,directional survey,borehole compensated sonic log,litho-density log(LDL),compensated neutron log(CNL),dual laterologmicrospherically focused log/dual induction-laterolog log/array induction log,temperature log,elemental capture spectroscopy(ECS)log,formation microimager(FMI)log,and array sonic log.The log suite of appraisal wells is almost the same as that for exploratory wells,excluding the ECS log and microresistivity scanning imaging.Meanwhile,for the logging of horizontal/highly-deviated holes,the log suite of vertical wells should be referred to according to specific well conditions.
