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| Sweet spot prediction in thick gas reservoirs with low permeability in Huagang Formation of Z gasfield in Xihu Sag， East China Sea Shelf Basin |
| HE Xianke1, LOU Min1, TU Qicui1, LI Bingying1, CAI Hua2 |
1. Shanghai Branch of CNOOC Ltd, Shanghai 200335, China;
2. CNOOC Research Institute Co., Ltd, Beijing 100028, China |
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Abstract The Xihu Sag of the East China Sea Shelf Basin is an area with great potential for exploring thick gas reservoirs with low permeability.The prediction of sweet spots is the key to the development of the reservoir.However，it is difficult to predict sweet spots of thick reservoirs with strong heterogeneity.The geophysical prediction technology and methods of different types of sweet spots are established for offshore thick gas reservoirs with low permeability.Firstly，based on the classification of sweet spots，rock physics and seismic forward modeling analyses are carried out to clarify the sensitive rock physics parameters and seismic response characteristics of sweet spots.Then，the appropriate pre-stack elastic inversion methods are selected to predict the spatial distribution of different types of sweet spots.The research results show that sweet spots of class I can be well characterized by direct inversion of P-wave modulus，and sweet spots of class Ⅱ can be well characterized by pseudo P-and S-wave velocity ratio inversion.The predicted thickness of the sweet spot before drilling is highly consistent with the actual drilling thickness of the development well.In addition，the coincidence rate of the sweet spot of class I is more than 80%，and that of class Ⅱis more than 70%.In conclusion，the method for sweet spot prediction is effective and highly accurate，and it has certain reference significance in the development of similar gas fields.
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Received: 01 March 2023
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2023, Vol. 58 
