大牛地气田盒1段致密砂岩气层识别

Recognition of Compacted Sandstone Gas Reservoir of the He 1 Member in Daniudi Gas Field

大牛地气田盒1段气层属于致密砂岩气层。因其低孔低渗以及气层测井响应不明显,增大了气层识别、评价的难度。根据储层岩性、物性、含气性等特点依托测井资料,建立测井解释参数模型;用曲线重叠法,孔隙度差比值法和无阻流量与多测井参数的交会图得出的有效气层下限值相结合,定性与定量对盒1段有效气层进行识别。该方法提高了对盒1段致密砂岩储层气、水、干层识别的准确率和有效性,为进一步评价致密砂岩气层提供依据。

The He 1 member of lower Shihezi Formation in Daniudi Gas Field belongs to typical compacted gas-bearing sandstone reservoir. Due to its unobvious low porosity,low permeability and well logging characteristics,it is difficult to identify and evaluate the gas reservoir. According to the lithology of reservoir,physical properties and gas bearing detection of the first member,the log interpretation model was set up. With the help of curves superposition method,the difference between porosity ratio method and the effective reservoir lower limit value derived from unimpeded flow and intersection layout with multiple logging parameters,we could achieve the qualitative and quantitative identification of the box 1 section of effective gas reservoir. The method improves on the He- 1 member compacted sandstone reservoir gas,water,dry layer of recognition accuracy and effectiveness,and provides the basis for further evaluation of compacted sandstone gas reservoirs.