塔中地区寒武系盐下白云岩卡层研究——以中寒2井为例

Study on Locating of Cambrian Subsalt Dolomite in Tazhong Area:Taking Well Zhonghan 2 as an Example

中寒2井主要通过地震方法进行预测,精度偏低,同时钻遇的沙依里克组盐层最深达到8349 m,是目前塔里木油田最深盐层,火成岩发育位置不确定,给现场卡层带来一定难度。借助有限的邻井资料进行精细地层对比,结合地震剖面、沉积相特征,准确卡取了目的层顶部,为塔中地区寒武系盐下白云岩的精准卡层提供了宝贵经验,也为塔里木油田钻井现场实现安全生产提供了更加坚实、精确的地质支撑。

Well Zhonghan-2 is mainly predicted by seismic method,with low accuracy.The deepest salt layer of Shayilik formation en⁃countered in this well is 8349 m,which is the deepest salt layer in Tarim Oilfield at present.The development position of igneous rocks is uncertain,which brings certain difficulties to target layer location on site.With the help of the limited adjacent well data for fine stratigraphic correlation,combined with the seismic profile and sedimentary facies characteristics,the top of the target layer was accurately determined,which provided valuable experience for the accurate location of Cambrian subsalt dolomite in Tazhong area and more solid and accurate geological support for the safe production of drilling sites in Tarim Oilfield.