Citation: | ZHANG Zhiwei, HE Min, CHEN Shenghong, CHEN Zhaoming, XU Chao, YUAN Cai. APPLICATION OF NEW METHOD TO PREDICTING CARBONATE POROSITY IN THE ZHUJIANGKOU BASIN[J]. Marine Geology Frontiers, 2017, 33(10): 49-56. doi: 10.16028/j.1009-2722.2017.10006 |
Porosity is critical to reservoir prediction, reservoir description, reservoir estimation and comprehensive reservoir study. It's also a critical technology to accurate estimation of oil reserve. Because of the strong heterogeneity of carbonate rock and strong lateral variation, the porosity prediction has remained a difficult problem for carbonate reservoir. Moreover, the accuracy of conventional method to calculate the porosity is not high enough and the physical meaning is always not so clear, it is hard to meet the needs of exploration and development. Therefore, through the reasonable simplification of the Gassmann equation and the introduction of Eshelby-Walsh dry rock ellipsoidal inclusions approximate formula, we derived a new formula to calculate the porosity. Three parameters, i.e. the pore structure parameters, saturated rock compressibility and rock matrix compressibility are included. Then through the intersection of logging technique charts and the inversion of pre-stack elastic parameters into the pore structure of carbonate and P-wave and S-wave velocity and density in the specific formula, considering the influence of carbonate rock pore structure with different phase, and the new method was applied. The results show that the porosity prediction method of carbonate rock pore structure has higher accuracy than the conventional method based on.
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W3-1 crossplot of porosity and P-wave impedance
Prediction profile of W2-2 porosity
Mudlog and log interpretation of W2-2
Original seismic profile of welltie
P-wave velocity (a)、S-wave velocity (b)and density (c) profile of the well-conncted pre-stack inversion
W3-3 crossplot of the effective compression coefficients of the saturated rocks and porosity
W3-3 crossplot of the P-wave velocity of the saturated rocks and porosity
WComparison of the two prediction methods with the measured porosity of W3-3
The contrast between the porosity from new method and the measured porosity of W3-1
The porosity profile through W3-1 of the new method
The porosity profile through W2-2 of the new method
The carbonate rocks seismic facies profile through W2-2 of well-connected
The mudlog of W2-4 W2-2 and W3-3
The the contrast between porosity by new method predicts and the measured porosity of W2-4
The porosity profile through W2-4 with the new method
The porosity profile through W2-2 With the new method