【作者】 李英；

【导师】 吴汉宁；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2005， 硕士

【摘要】 以川口油田上三叠统延长组长6地层岩性测井解释为基础,通过对砂泥岩剖面测井曲线与岩性的对应关系的研究与分析,建立起主要几种测井曲线(自然电位曲线、自然伽马曲线、电阻率曲线和声波时差曲线)与岩性和岩性组合的对应关系。在砂泥岩剖面中:砂岩的自然电位较低,泥岩的自然电位偏高;砂岩的自然伽马显示出最低值,粘土(泥岩、页岩)显示出最高值,而粉砂岩、泥质砂岩的显示介于中间;砂岩的电阻率变化范围比较大,一般从几个欧姆·米变至上千欧姆·米,当地层水的矿化度较低时,砂岩的电阻率高于泥岩,泥质砂岩的电阻率居于其间;当地层水矿化度很高时,砂岩的电阻率可能低于泥岩;一般情况是砂岩显示为低声波时差(高声速)400～180(2500～5500),泥岩显示为高声波时差(低声速)548～252(1830～3962),页岩介于砂岩与泥岩之间,砾岩一般具有低时差(高声速),且愈致密时差愈低。泥岩在声波时差曲线上显示为高值,当其致密程度增加时,声波时差降低。不同岩性组合在测井曲线上有不同的曲线特征。在应用沉积旋回原理的基础上,根据电测曲线及其在岩性的明显特征(沉积旋回和斑脱岩标志层)对长6地层进行进一步划分,分为6-1、长6-2、长6-3和长6-4几个亚层。通过对岩性地层的测井解释和对地层的进一步划分,为油田勘探开发研究提供了可靠依据,可成为陕北地区上三叠统同类油田的长6地层进行岩性解释和地层划分对比的应用标志之一。更多还原

【Abstract】 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.更多还原