博兴凹陷沙四段岩盐矿沉积特征分析

摘要

BoxingdepressionislocatedinthesouthwestofDongyingdepressionsequence,whichisformed inMesozoic Cenozoicdepressionbasin,andsedimentedthickCenozoicstrata.Basedonformerdataof gravimetric,seismicandpetroleumloggingdata,thereisalargeamountofmudstones,limestone,dolomitefaciesandpolyhaliteinthedepressionarea.Inaddition,smallscalegypsum bearingmudstoneand halitefaciesdevelopedinnortheastpartofthedepression.Halitedepositoccurredinthelowerpartofthe fourthsectionofShahejieformation.Throughprimaryanalysis,itisregardedthatBoxingdepressionis notanindependentsedimentarybasin.ItbelongstoDongyingdepressionsequence.%　　博兴凹陷位于东营潜断陷西南边缘，是一个形成于中—新生代的断陷盆地，沉积了巨厚的新生代地层。根据收集的历年博兴凹陷内的重力、地震及石油录井资料证实，区内大面积发育泥岩灰岩白云岩相地层，其东北部分布小范围的含膏泥岩石膏相和岩盐相地层。岩盐矿赋存于区内沙河街组四段下部。通过初步分析认为博兴凹陷不是一个独立的含盐盆地，它属于东营潜断陷盆地的一部分。