Dolomite is a high-quality reservoir,and has great potential economic value,but its seismic prediction methods in the case of complex tectonic are not perfect yet.Therefore,on the basis of the drilling core data,the geological and geophysical characteristic regulations of Maokou Formation dolomites are studied by the three-dimensional seismic exploration data.Basedon petrophysical analyses,pre-stack simultaneous inversion was effectively carried out to predict the favorable development area.The study shows that:(1)P-wave impedance Zp and the ration Vp/Vs attributes are the sensitive attribute for distinguishing dolomite from limestone.The distribution prediction of dolomite indicator(DIL) obtained by the integration of them show that,the central axis and the eastward area of the Wolonghe structure are the most favorable development area,and the prediction results highly accord with actual data.(2)Maokou Formation dolomite generally developed on the two wings of the fault,and the larger its thickness is,the closer with the fault.The influence on the thickness of dolomite in the lower wall of the structure by stratum reverse is smaller than that in the upper wall of the structure.
Gao Bo-le, Jin Ji-neng, Yan Jie, Li Yang, Zhao Dan, Wang Jian-yi
. Petrophysics characteristics and distribution prediction of Middle Permian Maokou Formation dolomites in Wolonghe block,eastern Sichuan Basin[J]. Natural Gas Geoscience, 2019
, 30(2)
: 168
-175
.
DOI: 10.11764/j.issn.1672-1926.2018.10.015
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