| Author's Name: LüQiaofeng, ZHONG Jialiang, TANG Jian, WU Turong, AN Dongling, CAO Mengxian, GAO Yunlong, HE Denglian, QIN Yuanming, WANG Feng |
| Institution: Experimental Center of CNOOC Energy Development Engineering Technology Branch (Zhanjiang) |
| Abstract: |
| In the four basins of the western South China Sea, there is a general relationship between reservoir quality and the contents of Al and V in clastic rock, that is the lower the contents of Al and V, the better of the reservoir quality. Further study shows that the contents of Al and V is not affected by radioactivity, and there is a positive correlation between them. Thus we can identify favorable reservoirs with lower mud content through looking for areas of the lower contents of Al and V. Based on the content crossplot of Al and V and logging lithology, the favorable reservoir zone, transition zone and undeveloped reservoir zone can be defined, and the lower or upper limit values of each zone can be demarcated quantitatively. The distribution areas of favorable reservoir zone, transitional zone and undeveloped reservoir zone can be identified by the plane distribution of the contents of Al and V. When using this technology to identify the favorable reservoir, the first step is to identify the dense reservoir by using the content of calcium element. This technology is widely used in DX, BX and other blocks of Yinggehai Basin and Qiongdongnan Basin. The favorable reservoir distribution area predicted before drilling is basically consistent with the actual drilling results. This technology is a good supplement to the method of using sedimentary facies to interpret favorable clastic reservoir and argillaceous rock cap, and also a powerful means of logging interpretation for high gamma sandstone affected by radioactivity. The technology also offer a new practical geophysical means to predict favorable reservoir and shale cover or interlayer, which applies the content curve of Al and V changing with depth and the lower or upper limit value of each reservoir zone to perform frequency division seismic inversion. |
| Keywords: the content of Al; the content of V; clastic rock; reservoir prediction; Yinggehai Basin; Qiongdongnan Basin |
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投稿时间：
2018-02-28 |
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