Research On The Interpretational Criteria Of Gas Bearing Reservoir's Thickness In Lamadian Oilfield

In the 1980s,with the raising of production level in oilfield, the development of the oilfield has gradually penetrated into the thin bed as well as the oil flecked and grease spots form-outside reservoirs. So far, their industry exploitation values have been confirmed. The gas data also have confirmed the second Pocono of which the lithology is argillaceous siltstoue with gas deliverability and industry exploitation value. Before 2000 year, Lamadian oilfield had calculated the gas in place three times, but because of some conditionalities, the late three times only calculated the first heavy film gas in place. So the gas interpretation needs once more drawing up.The first and the second gas demarcation criterions of Lamadian oilfield has ever been drawn up. In the first gas, the sand criterions have been adopted while in the interbeds, we have adopted a statistical approach of interbeds'proportion to deduce. However, the valid gas and interbed criterions haven't been drawn up,which affects the calculation of reserves and the geology model building. Therefore, it is imperative to further research the criterions of the valid gas, the first gas, the second gas and the interbed.In this paper, with using coring well materials and different kinds of methods, such as testing method, oil and gas production-like method as well as the physical method, we have developed different types of gas-sand material criterions. By the research of four sexual relations, the change relation between electrical, lithology, physical, and petroliferous propertities is highly consistent. According to the traits of the different phase logs,the gas interpretational and interbed deduction criterias are drawn up again by the different logging suites and gas types. Meanwhile, through the error statistics and the actual division, the testing is up to the requirements of the national reserves standards. So, the development of the standard is correct and reliable. it has very important theory senses and actual values for the gas thickness'explanation,the calculation of reserves and the geology model building.