Method for recognizing geological sweet spots in shale stratum
A stratum and shale technology, applied in the field of identifying geological sweet spots in gas-bearing shale strata, can solve problems such as small correlation
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Embodiment 1
[0050] figure 1A technical idea for identifying geological sweet spots in this embodiment is shown. The ideal identification method of geological sweet spot parameters requires accurate calculation of each geological sweet spot parameter with existing logging methods. The porosity of shale formations is small, and it is difficult to accurately calculate the porosity of shale formations with the conventional three-porosity logging method (sonic wave, neutron and density logging) due to the influence of multi-mineral and organic matter properties instability , NMR logging methods are needed to accurately determine formation porosity and irreducible water content, wherein formation porosity includes movable gas porosity and movable water porosity. The element logging method can effectively judge the complex mineral types and contents of shale formations, and obtain mineral content, which is beneficial to determine other geological sweet spot parameters of shale formations, and a...
Embodiment 2
[0098] In this embodiment, the logging data of a well in a shale formation in a block in southwest China is used as an example to illustrate the identification results of geological sweet spots.
[0099] The high-quality shale lithology in this block is mainly composed of yellow-gray shale and silty shale interbedded with thin lenticular limestone. The total organic matter content of this well is 4%, the gas porosity is 2%, and the kerogen content is 1%, the gas saturation is 70%, and the regional maximum values of these four parameters are: 8%, 6%, 6%, and 100%.
[0100] These four parameters are normalized, and the normalized geological sweet spot parameters are: the total organic matter content is 4 % 8 % = 0.5 , The air porosity is 2 % 6 % ...
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