摘要
综合利用露头、测井、录井及岩心资料,对准噶尔盆地二叠系佳木河组顶部不整合进行研究。指出不整合是具有空间结构的"地质体",包括正常沉积层、风化粘土层和风化淋滤层。根据各结构层组合的差异,可将该不整合划分为Ⅰ型和Ⅱ型两大类,前者三个结构层发育完整,具有"三明治式"结构,后者缺失中间的风化粘土层,为双层结构;其中,Ⅰ型不整合在平面上分布广泛,Ⅱ型则主要分布在克百大断裂和佳木河组尖灭线附近。并结合油气勘探成果对各结构层的控藏作用进行分析,认为风化淋滤层和由砂(砾)岩组成的正常沉积层既可作为油气运移的通道,也可作为油气聚集的储集体,但风化淋滤层厚度一般小于300m,且油气最易于富集在100m以上的区域;风化粘土层和正常沉积层中的泥岩是下伏地层油气成藏的封堵条件。
Comprehensive using dataof outcrops,well logging and core,the unconformity of the Permian top Jiamuhe formation were studied in Junggar basin.It is indicated that unconformity is the integrated＂geological terra＂with the spatial structure,including the normal sediments layer,weathered clay layer and weathering leached layer.According to differences of combinations of each textural layer,the unconformity of top Jiamuhe formation can be integrated into two types：the type-I and the type-II.The type-I has three fully development layers with a＂sandwich＂structure,which is widely distributed in the plane.The type-II has two layers,with adouble layer structure and missing the middle of the weathered clay,which is mainly distributed near Ke-Bai fault and Jiamuhe pinch.Utilizing the result of the oil and gas exploration,reservoir controlling of each textural layer were analyzed.The results suggest that the weathering leached layer and normal sediments layer composed of sandstone（conglomerate）can be used not only as channels for petroleum migration,but also as areservoir of oil-gas accumulation.However,the thickness of weathe-ring leached layer is commonly less than 300m,and the oil and gas are prone to accumulate in the region of more than 100m.Weathered clay and mudstone in normal sediments layer is the sealing conditions for oil-gas accumulation in underlying strata.
出处
《山东科技大学学报（自然科学版）》
CAS
2010年第5期24-28,共5页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家重点基础研究发展计划("973"计划)项目(2007CB209503)
关键词
准噶尔盆地
二叠系
佳木河组
不整合
油气成藏
Junggar basin
Permian
Jiamuhe formation
unconformity
oil-gas accumulation
