辽河兴古凹陷变质岩水平井岩性测井识别方法研究

Liaohe Xinggu Depression in Horizontal Well Logging Response Characteristics of Metamorphic Rocks

辽河兴古凹陷变质岩潜山是增加探明储量的重要区域。该地区水平井岩性测井识别方法研究对于岩性识别和潜山油藏勘探具有重要意义。本文根据不同岩性的测井数据做出交会图,得到变质岩的测井响应特征。由于伽马、密度、中子的方向性较差,在无重晶石地区竖直井和水平井的区别很小。因此可以利用常规井的交会图版识别出水平井的岩性。从而可得到水平井变质岩的测井响应特征。基于多矿物模型理论,建立超定方程组,利用反演和正演的方法,从常规井曲线识别出地层岩性,然后通过计算机编程实现。

Liaohe Xinggu metamorphic rocks of the buried hill is an important area in in- crease of proven reserves. Characteristics of the study is of great significance for the recog- nition of lithology and reservoir exploration in the region of buried hill in response to the horizontal well logging. This paper make a graph according to the log data of different li- thology, logging response character is tics of metamorphic rocks. Because gamma, density, neutron in the vertical wells and horizontal wells have little difference. So we can use con- ventional wells cross--plot identify lithology of horizontal wells. The log response charac- teristics can be obtained in horizontal wells of metamorphic rocks. Based on the theory of mineral model, establish the overdetermined equations. By using the inverse and forward method, lithology identification from conventional well log. Then realized by computer program.