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| Prediction of heterogeneous,thin Triassic sandstone reservoirs in the Lunnan area,Tarim Basin |
MI Xin-Wu1( ), ZHOU Cheng-Gang1, TIAN Jun1, HAN Yao-Zu1, LI Ya-Nan2, XIAO Bing-Qing1 |
1. Korla Branch of GRI of BGP Inc.,CNPC,Korla 841000,China
2. School of Earth Sciences and Engineering,Xi'an Shiyou University School,Xi'an 710065,China |
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Abstract The Triassic strata in the Lunnan area of the Tarim Basin represent a continental deltaic sedimentary system,with sedimentary subfacies including deltaic plain,deltaic front,and prodelta.The rapid phase transition of reservoirs and the high-frequency sand-mudstone alternating deposition create thin,highly heterogeneous reservoirs,rendering high-precision reservoir prediction extremely challenging.Under the guidance of sedimentary petrology and seismic sequence stratigraphy,this study conducted comprehensive seismic and geological research.Then,based on isochronous sequence interpretation,as well as seismic facies analytical results,this study established a lithofacies model.By constraining the pre-stack geostatistical inversion process,this study determined the spatial distribution of sand bodies.The practical application demonstrates that the proposed method enhances the vertical resolution of heterogeneous,thin reservoirs while significantly reducing lateral uncertainty.The predicted results align with actual drilling and production performance data and thus can provide valuable support for the efficient exploitation of hydrocarbon reservoirs.
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Received: 09 September 2024
Published: 22 April 2025
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Technical flow chart of continental heterogeneous thin reservoir prediction
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Lithofacies,logging facies and seismic facies identification chart of TII0 small layer sand body
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Correlation profile of Wells connected by multi stage sand uperposition model of TII0 small layer in Lunnan Triassic system
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Seismic interpretation scheme corresponding to multi-stage sand body superposition model of TII0 small layer in Lunnan Triassic system
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Seismic RMS amplitude attribute map of Triassic TII0 Phase Ⅰ sand body interpretation scheme in Lunnan System
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Sedimentary facies plan of TII0 small layer in the south and surrounding Triassic
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Analysis of rock physical characteristics
a—statistical histogram of P-wave impedance of sand-mudstone;b—statistical histogram of P-S velocity ratio of sand-mudstone
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Lithofacies model
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Comparison of simulation results of different methods
a,b,c—results of conventional geostatistical simulation of different random paths; d,e,f—simulation results of different random paths by phased geostatistics
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Comparison of inversion profiles with different methods
a—conventional inversion profile;b—pre-stack phase controlled geostatistical inversion profile
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Pre-stack phase controlled geostatistics inversion results and seismic waveform superimposed profile
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Pre-stack inversion effect verification well analysis diagram
a—well8 cross well inversion profile;b—well8 comparison of measured and inversion extraction curves; c—well9 cross well inversion profile; d—well9 comparison of measured and inversion extraction curves
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Pre-stack phase-controlled geostatistical inversion profile along the direction of well10 trajectory
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Comprehensive horizontal column diagram of well10
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