Application of multistage phase-controlled inversion based on reservoir configuration analysis in reservoir prediction of reef-shoal complex
CHAI Hui1, WANG Wen2, WEN Guangyao1, GONG Xinlin1, DONG Jianxiong2, NIU Zhiwen2
1. CNPC International(Turkmenistan), Beijing 100034, China; 2. Oversea Business Department, Geophysical Research Institute, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：The complex internal structure， wide reservoir thickness variation， poor connectivity， large difference in productivity between adjacent wells， and prominent contradiction between reserves and production of gentle slope reef and shoal of Jurassic Karlov-Oxford carbonate reservoirs in Amu Darya Basin affect the efficient and stable development of gas reservoirs. Therefore， through forward modeling to identify the shape of reef-shoal body， phase transformation process to characterize the internal structure of the reef-shoal body， and the reservoir sedimentary microfacies study， the configuration model of carbonate reef-shoal complex reservoir is established， and a multistage facies-controlled geostatistical inversion technique is developed. The conclusions are as follows： ①The relative energy relationship between the interface of the seismic response of model 2 （the reef and the shoal are covered with thick gypsum layer and thin salt rock， and the thickness of the reef and the shoal is small） is consistent with the well data. The reef and the shoal have the seismic reflection characteristics of “flat bottom and convex top”， chaotic internal reflection， relatively weak amplitude， and increased thickness. Model 2 can be used to accurately characte-rize the reef and shoal body in the no-well area. ②The seismic data processed by phase transformation is more conducive to the analysis of the reef-shoal inner structure than the original seismic data， and the change of the in-phase axis amplitude reflects the lithologic change of the reef-shoal inner structure. ③Combined with deposits of modern reef-shoal bodies， the internal configuration of the reef-shoal reservoir is established based on forward modeling， phase transformation， and seismic attribute analysis. It shows that high-energy reef-shoal reservoirs are mainly distributed at the edge of the reef-shoal body under the control of paleotopography and hydrodynamic energy. ④The multistage facies-controlled inversion based on reservoir configuration analysis accurately describes the inner structure of reef-shoal reservoir and is consistent with production characteristics. It improves the accuracy of reservoir prediction and has important guiding significance for the adjustment of development plans and reserve utilization.
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