finish some tasks

Today, I finished some tasks.

Summary:

1. finish compile BHP and Hess dataset.

2. check that VPVS=DTSM/DTCO
    I check it in Hess well and it is true. I did not find VPVS in BHP well. I think it also means that           VPVS is obtained by DTSM/DTCO.

3. do some research on sonic logs. There are some applications for them:
    quality control of transit-time logs
    refinement of porosity predictions
    determination of lithology
    improvement of fracture detection
    improvement of cement bond evaluation

Tomorrow, I will learn more about sonic logs and start to predict them by conventional logs.