Russian to English Science Geology oil & gas exploration and production

As in: "В различных интервалах был выполнен отбор образцов с помощью бокового грунтоноса, однако получить корреляционные связи между коллекторскими свойствами этих образцов невозможно, поскольку нет перекрытия интервалов отбора образцов боковым грунтоносом и обычного отбора керна."

The document deals primary with test results from exploration wells.

What I've come up with is:

"Samples were collected at various intervals using a sidewall core catcher; however, a correlative relationship between the reservoir properties could not be obtained from these samples because there is no seal of the intervals of the collected sidewall core catcher samples and a typical core sample collector."

Suggestions?