基于地震地层学的砂砾岩期次划分方法研究

Glutenite sedimentary circle division method based on seismic stratigraphy study

砂砾岩体沉积常发育于盆地的陡坡带,内部多期砂砾岩沉积叠置,构造复杂,地层标志层不明确,后期受到构造运动的影响变形严重。通过相邻井测井曲线特征无法找到同一期次界面存在的类似响应,利用测井曲线进行对比难以进行期次划分。地震地层学认为地震同相轴反映了岩性或地层的界面,根据这个原理,以沉积特征与地质认识为指导,以地震资料为基础,结合地震相等方法,对永1砂砾岩体划分为9个期次,通过井震结合,赋予地震分层地质意义,并分析井上地质分层与地震分层之间存在的误差,考虑多方面影响因素修正期次划分结果,利用开发动态等资料对划分结果进行验证。以这种方法划分的期次合理,符合地质认识,并且有效地解决开发动态中的矛盾。

Glutenite sedimentary are generally developed in the steep slope of basins, inside which mainly are the multi-phase glutenite with complex structure and undefined marker bed, meanwhile, serious deformation exist as the result of tectonic movement.Similar response existed in the second interface can hardly be found by the logging curve characteristics of adjacent wells in the same period, so it is difficult to divide the sedimentary circles. According to the seismic stratigraphy study, the seismic events reflects the lithology or stratigraphy interface. Based on this principle, guided by the sedimentary and geology characters, and combined with the method of seismic facies, Yong-1 glutenite sedimentary was divide into 9 circles, the seismic circle geology meaning was endowed by the combination of well and seismic, and the error of geological stratification and seismic stratification was analyzed. Considering multiple influences on modifing the cycle division, the results were verified with the data of dynamic production.The reasonable stratigraphy circle obtained by this division method consists with the geology concept and can resolve the contradiction in dynamic production effectively.