The Log Characteristic And The Correlation Of Strata Of Chang6 Strategy Of Upper Triassic In The Chuankou Oil Field Of Shanbei

Make the basis of the log explanation of Chang6 Strategy of upper Triassic in the oil field of Chuankou, the matched relationship was build that of between some main log (Self-potential ,Self-gamma ray, Resistivity and Acoustic log) and the property of rock and the combination of the property of rock through the research and analysis of matched relationship of sandstone and mudstone section log and property of rock, In the section of sandstone and mudstone, Self-potential of sandstone is lower, that of mudstone is higher. Self-gamma ray of sandstone is the lowest, that of mudstone is the highest, siltstone and argillaceous sandstone to lie in between; Resistivity of sandstone is ranged from few ohm to thousands of ohm, but that of mudstone is decided by mineralization degree of stratigraphic water. when the mineralization degree of stratigraphic water is lower, Resistivity of sandstone is higher than that of mudstone, resistivity of sandstone is lower than that of mudstone when the mineralization degree of stratigraphic water is higher. Generally, the Acoustic log of sandstone shows lower (higher acoustic velocity) 400~800(2500~5500), that of mudstone is higher (lower acoustic velocity) 548~252(1830~3962), when it becomes denser, the acoustic log become lower. The different combination of the property of rock have the different log characteristic. In the learning of sedimentary cycle, the bed of Chang6 is subdivided into Chang6-1, Chang6-2, Chang6-3 and Chang6-4 according to the obvious characteristic of log and that one's property of rock (the sedimentary cycle and the marker bed of Bentonite). that provide reliable bases for petroleum exploration, which can be one of symbols of log explanation of geolith and the separation of layer of Chang6 Strategy of upper Triassic in the same kind of oil field of shanbei.