Two-step facies-constrained inversion in prediction of carbonate rock fault-controlled reservoirs with post stack seismic in No.8 structure of Shunbei block, Tarim Basin
Received date: 2023-03-30
Revised date: 2023-05-30
Online published: 2023-11-24
Fault controlled reservoir is a special multiple porous media reservoir which was formed by deep acid fluid dissolution and transformation of multi-stage active strike slip fault fracture zone. The internal structure of fault controlled reservoir is extremely complex, and with strong vertical and horizontal heterogeneity of reservoir space, which has obvious separation tunnel structure in vertical and horizontal. Conventional seismic inversion methods have problems such as low resolution, missing details in characterizing the internal structure and physical properties. In this paper, a fault-controlled carbonate reservoir prediction technique based on two-step facies constrained inversion is proposed, and this is a case study in No.8 structure of Shunbei block, Tarim Basin. First step, using the envelope of the structure tensor attribute volume as the space constraint face to create the seismic facies constrained low frequency trend model, it has the benefit to reduce the interference of horizontal layered seismic reflection on the deterministic inversion effectively, getting an accurate characteristics of the top and bottom positions of the reservoir and the internal heterogeneity on the lateral variation of the reservoir under seismic resolution. Second step, based on deterministic inversion acoustic impedance and probability density function from logging lithofacies (cave facies, vug facies, fracture facies and non reservoir facies), a geostatistical inversion facies-constrained body model is established using Bayesian inference, and three-level facies control geostatistical inversion is carried out to improve the fault-controlled reservoir’s accuracy on lateral and the prediction resolution of reservoirs in vertical. The inversion results show that the two-step series workflow of seismic facies constrained deterministic inversion and three-level facies-controlled geostatistics inversion established in this study is both predictive and descriptive. It has broken through the limitation of seismic resolution, having the capability of describing fault-controlled reservoir’s internal details. More internal morphology and physical property characteristics of reservoir were found. The workflow of this case study has extendable and utility value to similar data and geological conditions oil field.
Haiying LI , Wei LI , Jun LIU , Wei GONG , Wanlong ZHANG . Two-step facies-constrained inversion in prediction of carbonate rock fault-controlled reservoirs with post stack seismic in No.8 structure of Shunbei block, Tarim Basin[J]. Natural Gas Geoscience, 2023 , 34(11) : 1961 -1970 . DOI: 10.11764/j.issn.1672-1926.2023.05.009
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